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Search Term: " Luein s "
How Does Lutein Help Fight Against Macular Degeneration?   
Date:
August 19, 2011 01:11 PM
Lutein from the Latin meaning of yellow, luteus, is a xanthophyll and is a naturally-occurring carotenoid. It is abundant in leafy vegetables which are green in color like spinach and kale. Lutein can also be found in egg yolks and is also present in plants as a fatty-acid tester and most of all, it can be found in the retina and concentrated in the macula, which is a small area of the retina mainly responsible for central vision. This helps the eyes to be protected from oxidative stress and blue light photons with high energy. Eye Health
Several studies have found that an increase in macula pigmentation helps decreases the risk for eye diseases and one of them is Age-related Macular Degeneration(AMD). Some concluded that visual activity is improved with lutein supplementation alone or lutein together with other nutrients. Other studies also show that AMD seemed to be directly related to having low carotenoids in the body. It does follow in this It commonly follows that this daily attention to the diet to get all the required lutein for our body is where supplementation suggestion comes in since many are not able to do so especially for people around the age group of 70 and up where the attention needed is just too taxing. And since failure to have sufficient lutein is not acceptable for these people with a high risk of AMD or those already with AMD but hopes to slow it down or even stop the progression of the decease, supplementation is a viable and reliable way to assure sufficient lutein intake. This would eventually lead to increases in blood serum levels that would be equal to a diet sufficient of high lutein foods. However it’s worthy to note that risk reduction does not equate to a cure because once macular degeneration has started there is no way to reverse it. But reduction of risk may be an implication of prevention for some people. Further research needs to be done. However in terms of prevention before the decease starts, results have been promising.
(https://vitanetonline.com:443/forums/Index.cfm?CFApp=1&Message_ID=2400) Lutein 20mg (FloraGlo) 
Date:
September 26, 2008 03:49 PM
Maintains Healthy Visual Function* It has been well established that lutein is present in high concentrations in the retinal tissue of the human eye. However, a study was conducted in human volunteers to determine whether taking lutein in supplement form actually increased the density of the carotenoid pigments present in the macula. In this study of eight individuals, researchers estimated the density of the macular pigments prior to having each individual take 10 mg of lutein daily in supplement form for 12 weeks. Plasma lutein concentrations were measured at 4-week intervals. During the first four weeks of the study, plasma levels increased five-fold from pre-supplement measures, and then remained at this level for the duration of the study. It was also shown that, due to increased deposition of lutein in optical tissues, macular pigment density increased by an average of 5.3% at the 4-week mark, and continued to increase until the duration of the study.1 A study was also conducted to investigate the possible role of specific nutrients in protecting the lens of the eye against aging, a risk factor for compromised visual function. The study was comprised of 376 individuals aged from 18 to 75. Of the nutrients measured, it was found that the lenses of individuals with higher concentrations of lutein and zeaxanthin showed less of an effect from the aging process. The investigators concluded that these carotenoids might play a protective role in supporting the maintenance of healthy vision.2 The Age-Related Eye Disease Study (AREDS) was a landmark study of the effects of diet and antioxidant supplementation on eye health. The study enrolled over 3500 subjects aged 55 to 80 years who were followed for approximately 6 years. Among the data collected in this multi-faceted study was a self-administered Food Frequency Questionnaire (FFQ). The AREDS Report No. 22 examined the data from the FFQs and determined that, of the nutrients evaluated, only lutein and zeaxanthin were directly related to maintaining eye health with statistical significance3. These findings corroborated similar results of an earlier multi-center study published in the Journal of the American Medical Association that also found that those with a higher intake of lutein and zeaxanthin maintained healthier eye function.4 These promising results have spurred the design of a second major clinical trial (AREDS2), which is currently enrolling participants to study the impact of supplemental xanthophylls (FloraGLO® Lutein and zeaxanthin) and other nutrients on age-related eye health.5 In addition, a double-blind placebo controlled trial was performed in ninety individuals who had signs of compromised visual function. Individuals were divided into three groups and received either 10 mg FloraGLO® lutein, 10 mg FloraGLO® lutein plus a multivitamin/multimineral formulation, or placebo for 12 months. In both the FloraGLO® lutein and FloraGLO® lutein plus other nutrients groups, improvements were seen in mean eye macular pigment optical density, visual acuity and contrast sensitivity. No improvements were noted in the placebo group.6 These results demonstrate FloraGLO® lutein’s beneficial effect on maintaining healthy visual function. Newly published research has demonstrated that lutein and zeaxanthin supplementation may enhance visual performance under glare conditions. Forty healthy subjects took daily doses of 10 mg FloraGLO® Lutein plus 2 mg zeaxanthin for six months. They were evaluated for changes in macular pigment, glare disability and photostress recovery at the onset of the study, and at 1, 2, 4 and six months. After six months, subjects experienced an average increase in macular pigment optical density (MPOD) of 39% compared to baseline, and all but two participants experienced some increase in MPOD. This increase in MPOD was also directly related to measured improvements in visual performance after exposure to bright light, as well as photostress recovery.7 This study suggests another way in which lutein and zeaxanthin can help support optimal visual function in healthy individuals. Potent Antioxidant Protection* Most of the beneficial effects of lutein are ascribed to its potent free radical scavenging abilities. It is well-known that lutein is a carotenoid related to beta-carotene and possesses antioxidant activity against a number of reactive oxygen species.8 More direct evidence for the free radical scavenging activity of lutein is found in studies of its effects on human lens epithelial cells. Cell cultures were exposed to ultraviolet light after pretreatment with lutein or alpha-tocopherol. Both nutrients were found to reduce ultraviolet-induced damage to lens epithelial cells. However, lutein was shown to have significantly higher photoprotective activity than alpha-tocopherol9 demonstrating its potential as a high-powered antioxidant. A further review of the mechanisms of lutein in conferring a protective role reveals evidence for its antioxidant activity in various body tissues. Lutein has been shown to be an effective antioxidant in vitro as well as in experimental models of a number of body systems.10 Supports Healthy Skin* A recent randomized, double blind, placebo-controlled study has demonstrated the positive effects of oral and topical administration of lutein on skin health parameters (surface lipids, hydration, photoprotective activity, skin elasticity and skin lipid peroxidation). Forty female subjects were divided into four treatment groups. Treatment options included oral administration of 5 mg of FloraGLO® Lutein twice daily or placebo and topical administration of 50 ppm FloraGLO® Lutein twice daily or placebo. Each treatment group received either an active oral treatment with a placebo topical treatment, a placebo oral treatment with an active topical treatment, both active treatments, or both placebo treatments. Statistically significant improvements were seen in all five parameters tested in all treatment groups compared to the group receiving only placebos. The greatest overall improvements were seen in the group receiving both active oral and topical treatments, while lesser but still significant improvement was seen in both the active oral only and the active topical only groups. Additionally, oral administration of lutein conferred superior photoprotective activity (as measured by skin surface redness after exposure to ultraviolet light) and prevention of lipid peroxidation (as indicated by levels of malondialdehyde in skin lipids after exposure to ultraviolet light) than either topical lutein or placebo.11 Diverse Cinical Benefits* Evidence from various experimental trials suggests that lutein may play a protective role on the circulatory and cardiovascular systems. Its antioxidant activity may also extend to the heart, skin, lungs and blood vessels, making it a nutrient with diverse clinical benefits. Lutein possesses the ability to promote the health of many body tissues.12 Suggested Adult Use: One softgel daily with food, or as directed by a health care professional. Does Not Contain: milk, egg, wheat, sugar, sweeteners, starch, salt, or preservatives. Scientific References 1. Berendschot TT, et al. Influence of lutein supplementation on macular pigment, assessed with two objective techniques. Invest Opthalmol Vis Sci. 2000 Oct; 41(11): 3322-6. 2. Berendschot TT, et al. Lens aging in relation to nutritional determinants and possible risk factors for age-related cataract. Arch Opthalmol. 2002 Dec; 120(12): 1732-7. 3. Age-Related Eye Disease Study Research Group. The relationship of dietary carotenoid and vitamin A, E, and C intake with age-related macular degeneration in a case-control study: AREDS Report No. 22. Arch Ophthalmol. 2007 Sep; 125(9): 1225-32. 4. Seddon JM, et al. Dietary Carotenoids, Vitamins A, C, and E, and Advanced Age-Related Macular Degeneration. JAMA. 1994 Nov; 272(18):1413-1420. 5. www.nei.nih.gov/neitrials/viewStudyWeb.aspx?id=120. Clinical Studies Database. Age-Related Eye Disease Study 2 (AREDS2). Last Updated 2/28/2008. Viewed 5/15/2008. 6. Richer S, et al. Double-masked, placebo-controlled, randomized trial of lutein and antioxidant supplementation in the intervention of atrophic age-related macular degeneration: the Veterans LAST study (Lutein Antioxidant Supplementation Trial). Optometry. 2004 Apr; 75(4): 216-230. 7. Stringham JM and Hammond BR. Macular pigment and visual performance under glare conditions. Optom Vis Sci. 2008 Feb; 85(2):82-8. 8. “Lutein and Zeaxanthin”. PDR Health. www.gettingwell.com/drug_info/nmdrugprofiles/nutsupdrugs/lut_0164.shtml 9. Chitchumroonchokchai C, et al. Xanthophylls and alpha-tocopherol decrease UVB-induced lipid peroxidation and stress signaling in human lens epithelial cells. J Nutr. 2004 Dec; 134(12): 3225-32. 10. Krinsky NI. Possible biologic mechanisms for a protective role of xanthophylls. J Nutr. 2002; 132: 540S-542S. 11. Palombo P, et al. Beneficial Long-Term Effects of Combined Oral/Topical Antioxidant Treatment with the Carotenoids Lutein and Zeaxanthin on Human Skin: A Double-Blind, Placebo-Controlled Study. Skin Pharmacol Physiol. 2007; 20: 199-210. 12. Mares-Perlman JA, et al. The body of evidence to support a protective role for lutein and zeaxanthin in delaying chronic disease. Overview. J Nutr. 2002; 132: 518S-524S.
(https://vitanetonline.com:443/forums/Index.cfm?CFApp=1&Message_ID=1901) Lutein: A Plant Pigment That Provides Protection From The Sun
Date:
October 23, 2007 10:00 AM
Lutein is a plant pigment, and protects protection from the sun needed to prevent damage to the skin and eyes from its strong ultra violet (UVB) radiation. Lutein is a carotenoid and strong antioxidant that is found in red, yellow, orange and dark green fruit and vegetables such as broccoli, curly and sea kale, spinach, carrots peppers and squashes. It is also available from egg yolks, corn and some fruits such as pomegranates. It is the colored pigments, especially the reds, yellows and oranges, in which lutein is most found. Lutein can also prevent cataracts and provide benefits for age related macular degeneration. However, before discussing the benefits, it is necessary to discuss exactly what these conditions are and what causes them. Let’s have a heads up on cataracts first. A cataract takes the form of a clouding of the lens of the eye that leads to blurred vision and eventual virtual blindness when the cloudiness is extreme. It is not blindness due to problems with the nerves of the eye, but due to the lens become cloudy, and scattering light entering the eye. It is not a film over the eye as many people believe, but a cloudiness of the lens, and cataracts can normally be treated by removing the whole lens and replacing it with a lens implant – or a synthetic lens. It is not fully understood how lutein can help cataracts, but studies have shown that those take a large quantity of lutein in there diet have up to 50% less chance of getting cataracts that those that do not. It has also been demonstrated that men who ate broccoli and spinach regularly had a 25% less chance of getting cataracts. The same is true of those that include a lutein supplement of around 6 mg daily, although up to 20 mg is considered an effective dose. However, it not only through its properties in protecting against cataracts that lutein can help to preserve the health of your eyes. It is also through its effect on macular degeneration. The macula is small part in the center of the retina that allows you to see central vision in high detail, especially close up when you use the center of your eye. Age-related macular degeneration, known as MD, affects your macula so that you can see fine round the edges, but your central vision is blurred. It is therefore difficult to drive, read or carry out tasks that need good central focus. You will find it next to impossible to thread a needle for example. It can come on very slowly, in fact so slowly that you never notice it because the change from day to day, or even week to week, is so small. It is not coincidence that lutein is concentrated in the macula, and that a lutein supplement can help to prevent macular degeneration. Lutein is believed to filter out some of the blue wavelengths of light, and it is the blue wavelengths that are though to cause free radical damage and oxidative stress to various organs of the body exposed to light, but specifically the eyes. That is why it is believed that lutein helps to prevent macular degeneration, and studies have indicated a good supplement to consist of up to 30 mg each day. It can also protect the skin from damage by UV radiation, and also prevents free radical damage to skin cells causing premature aging of the skin. The latter occurs through its antioxidant properties, while the former is because if its light filtering properties. It can not only filter out the blue light that can cause macular degeneration but also ultra-violet radiation that affects the skin and can cause skin cancer. There is a fine line between the blue and ultra violet wavelengths from sunlight, and both can contribute to certain medical conditions. However, the absorptive properties of lutein are such that it can absorb the more harmful of these. The antioxidant properties of lutein are important in their own right, and can help to reduce cholesterol deposition in arties and help to maintain a healthy arterial wall thickness. The same is true of any carotenoids that reduce heart problems, some cancers, especially of the cervix, stomach and lungs, and others that can be caused by free radical action and narrowed arteries such as strokes and brain hemorrhages. Although it is not one of those supplements considered essential, lutein is biologically essential in that it cannot be produced by the body. It has to be taken through the diet. There is no specific recommended daily allowance (RDA) because life can go on without it, but it does play a role in your everyday health. However, the average person has a lutein intake less than that needed to take advantage of its UV protection or antioxidant effect. As previously stated, the effective dose is considered to be 30 mg daily, and the average American intake is about 2 mg. That’s an awful lot of egg yolks or tomatoes you are going to have to eat! If you do intend to take your lutein from the natural source, then it much more easily assimilated into your body if not overcooked. Lightly steaming is the best way to prepare your vegetables for maximum nutritional effect. You can also take lutein as a supplement in the form of tablets, creams and drinks, and can also be found in other supplements that contain carotenoids such as lycopene and beta-carotene. Although not consider essential to life, do not underestimate the health benefits to be gained from a diet high in lutein, especially if you value the health of your eyes. All strong antioxidants provide you with health benefits due to their ability to destroy the free radicals that in turn destroy the DNA in your body cells, and disrupt the cells themselves. Combine that with their action as filters to the damaging rays of the sun and you have in lutein a plant product that is far reaching in the health benefits that it can provide you with. If you are looking for a lutein supplement, stop into your local or internet health food store for lutein is an over the counter supplement.
(https://vitanetonline.com:443/forums/Index.cfm?CFApp=1&Message_ID=1603) Lutein eases blocked blood flow to eyes
Date:
August 11, 2006 01:50 PM
A recent study supported by Kemin Food Asia and conducted at the College of Medicine, Catholic University of Korea suggested that lutein protects the retina from cellular damage caused by eye conditions, including diabetic retinopathy and age-related macular degeneration. The researchers injected rats with lutein prior to retinal ischemia, or reduced blood flow to the retina caused by obstruction of the blood vessels. Results showed the lutein inhibited retinal degeneration, which is marked by reduced expression levels of neuronal nitric oxide synthase and Cyclo-oxygenase-2, or COX-2. In addition, the reduction of these proteins appeared to be dose-dependent, which would imply benefit from increased exposure to this carotenoid. According to the lead author of the study, “These results suggest that a lutein supplement may protect against ischemia mediated cell death in the retina."
(https://vitanetonline.com:443/forums/Index.cfm?CFApp=1&Message_ID=1352) Lutein to fight age-related macular degeneration!
Date:
February 27, 2006 05:53 PM
Lutein: The Antiordinary Antioxidant Lutein belongs to a class of compounds known as carotenoids. Carotenoids in general are yellow, orange, or red pigments responsible for many of the colors of the foods we consume each day. To date, over 600 carotenoids have been identified in nature, but are only produced by plants, algae and bacteria leaving humans and animals to consume carotenoids in the diet. Forty to fifty carotenoids are consumed in the typical US diet, but only 14 have been detected in the blood, indicating a selective use of specific carotenoids by the body. Lutein is one of these carotenoids found in the blood and has been increasingly associated with eye health over the last decade. Lutein’s role in eye health In the human eye, lutein is concentrated in the center of the retina in an area known as the macula. Lutein is deposited in the macula through the lutein we consume in out diet or through supplements. This area is responsible for human central vision and is colored intensely yellow due to high concentrations of lutein. Lutein is thought to be beneficial for eye health by reducing damage in the eye in two ways: 1) by absorbing blue light (blue light is thought to increase free radical formation in the eye) and 2) by acting as an antioxidant, reducing damage in the eye caused by free radicals. Leading carotenoid researchers believe these functions may lead to a reduced risk of age-related macular degeneration (AMD) and cataracts. Age-related macular degeneration Macular degeneration is the leading cause of blindness in the USA in those over 65. twenty-five and thirty million people are afflicted worldwide and currently there are no effective treatments for the disease. The disease has two forms known as dry and wet AMD. Ninety percent of AMD cases diagnosed are the dry form. In dry AMD, also referred to as early AMD, debris deposits under the center of the retina (known as the macula) interfering with its normal function. Parts of the macula atrophy, causing the central vision to slowly become dimmer or more blurry. Wet age-related macular degeneration, also known as late AMD, often develops in areas where dry AMD exists. Abnormal blood vessels grow and leak blood and fluid under the macula, causing scarring, which leads to rapid loss of central vision. Dr. Joanna Seddon published one of the first studies demonstrating a link between lutein intake and AMD risk in 1994 (1). This epidemiological study compared the risk of developing AMD to nutrient intake and showed a significant reduction in risk for developing AMD as lutein intake reached 6mg per day (57% reduction in risk). Since the Seddon study, researchers have shown that increasing dietary lutein intake raises blood levels of lutein as well as levels of lutein in the eye (2). Bone et al. demonstrated that eyes with higher levels of lutein were less likely to be afflicted with AMD (3). The latest clinical trial that investigated lutein’s role in AMD is known as the lutein antioxidant supplementation trial (L.A.S.T) (4). This study evaluated the effects of lutein supplementation for one year in 90 veterans diagnosed with dry AMD. Supplementation with lutein in these subjects significantly increased the concentration of lutein in the macula. Improvements in visual function were also detected with lutein supplementation. Glare recovery, visual acuity, and contrast sensitivity were all improved. This study continues to build on clinical evidence that the dry form of AMD may be responsive to changes in nutrition. Cataracts A cataract is a natural clouding of the lens, the area of the eye responsible for focusing light and producing clear, sharp images. For most people, cataracts are a natural result of aging. Currently in the US, cataracts are the second leading cause of blindness in the elderly behind AMD. Lutein is the major carotenoid that has been identified in the human lens asn is thought to provide similar benefits to the leans that are seen in the retina. Two large epidemiological studies consisting of >70,000 women (age 45-71) and >30,000 men (age 45-75) compared the risk of cataract extraction to nutrient intake (5,6). Similar to AMD, a significant reduction in risk of cataract extraction was associated with lutein intakes of 6mg per day (20% reduction in risk). Besides cataract extraction, higher levels of lutein consumption have been associated with a decreased risk of cataract development and improvements in visual acuity and glare sensitivity in people with age-related cataracts. Lutein consumption The richest source of free lutein in the typical US diet are dark green leafy vegetables, with the highest concentration found in kale followed by spinach. The average daily lutein intake is low, average between 1-2 mg/day. Currently there is no recommendations of the dietary guidelines for Americans 2005 (9 servings of fruits and vegetables every day) you would consume between 4 and 8 mg of lutein a day (7). Epidemiological evidence, animal models, and clinical data have indicated levels of 6-10 mg a day may be necessary to realize the health benefits associated with lutein consumption. By continuing to increase our intake of lutein, we begin to ensure the optimal health of our eyes. References: Seddon et al. (1994) dietary carotenoids, vitamin a, c, and e, and advanced age-related macular degeneration. Eye disease case-control study group. JAMA. 272: 1413-20. Bone et al. (2000) Lutein and zeaxanthin in the eyes, serum and diet of human subjects. Exp. Eye Res. 71: 239-45. Bone et al. (2001) Macular pigment in donor eyes with and without AMD: a case-control study. Invest. Ophthalmal. Vis Sci. 42: 235-40. Richer et al. (2004) Double-masked, placebo-controlled, randomized trial of lutein and antioxidant supplementation in the intervention of atrophic age-relaged macular degeneration: the veterans LAST study (Lutein Antioxidant Supplementation Trial). Optometry. 75: 216-30. Brown et al. (1999) A prospective study of carotenoid intake and risk of cataract extraction in the US men. Am. J. Clin. Nutr. 70: 517-24. Chasen-Taber et al. (1999) A prospective study of carotenoid and vitamin A intakes and risk of cataract extraction in US women. Am. J. Clin. Nutr. 70: 509-16 HHS/USDA. Dietary Guidelines for Americans 2005. //www.healthierus.Gov/dietaryguidelines/CDC. National health and nutrition examination survey data 2001-2002. //www.cdc.gov/nchs/about/major/nhanes/nhanes01-02.html Brandon lewis, Ph.D. is the applied research and Technical services manager at kemin health, L.C. in des moines, iowa. His responsibilities include the initiation and management of laboratory projects pertaining to the inclusion and analysis of kemin ingredients in vitamins and dietary supplements, as well as developing new applications and prototypes that include kemin ingredients. Prior to joining kemin, Brandon was enrolled at the university of Florida where he received his Ph.D. in Nutritional Science from the department of Food Science and Human Nutrition.
(https://vitanetonline.com:443/forums/Index.cfm?CFApp=1&Message_ID=1235) Best Lutein Featuring Biolut Marigold Ext., 60 VC
Date:
July 27, 2005 11:54 AM
Benefits It has been well established that lutein is present in high concentrations in the retinal tissue of the human eye. However, a study was conducted in human volunteers to determine whether taking lutein in supplement form actually increased the density of the carotenoid pigments present in the macula. In this study of eight individuals, researchers estimated the density of the macular pigments prior to having each individual take 10 mg of lutein daily in supplement form for 12 weeks. Plasma lutein concentrations were measured at 4-week intervals. During the course of the study, plasma levels increased five-fold from pre-supplement measures. It was also shown that macular pigment density increased by an average of 5.3% after 4 weeks due to increased deposition of lutein in optical tissues.1 A second study compared the oral bioavailability of esterified lutein, the form in Best Lutein, versus non-esterified lutein in 18 human volunteers. Serum levels of lutein were measured at particular timepoints after consumption of a single dose of lutein. Researchers found that in these individuals, the lutein ester formulation was nearly 62% more bioavailable than non-esterified lutein, as determined by a higher mean area under the curve (AUC) and higher serum concentrations.2 A study was also conducted to investigate the possible role of specific nutrients in protecting the lens of the eye against aging, a risk factor for compromised visual function. The study was comprised of 376 individuals aged from 18 to 75. Of the nutrients measured, it was found that the lenses of individuals with higher concentrations of lutein and zeaxanthin showed less of an effect from the aging process. The investigators concluded that these carotenoids may play a protective role in supporting the maintenance of healthy vision.3 In addition, a double-blind placebo controlled trial was performed in ninety individuals who had signs of compromised visual function. Individuals were divided into three groups and received either 10 mg lutein, 10 mg lutein plus a multivitamin/multimineral formulation, or placebo for 12 months. In both the lutein and lutein plus other nutrients groups, improvements were seen in mean eye macular pigment optical density, visual acuity and contrast sensitivity. No improvements were noted in the placebo group.4 These results demonstrate lutein’s beneficial effect on maintaining healthy visual function. • Potent Antioxidant Protection* Most of the beneficial effects of lutein are ascribed to its potent free radical scavenging abilities. It is well-known that lutein is a carotenoid related to beta-carotene and possesses antioxidant activity against a number of reactive oxygen species.5 More direct evidence for the free radical scavenging activity of lutein is found in studies of its effects on human lens epithelial cells. Cell cultures were exposed to ultraviolet light after pretreatment with lutein or alpha-tocopherol. Both nutrients were found to reduce ultraviolet-induced damage to lens epithelial cells. However, lutein was shown to have significantly higher photoprotective activity than alpha-tocopherol6, demonstrating its potential as a high-powered antioxidant. A further review of the mechanisms of lutein in conferring a protective role reveals evidence for its antioxidant activity in various body tissues. Lutein has been shown to be an effective antioxidant in vitro as well as in experimental models of a number of body systems.7 • Diverse clinical benefits* Evidence from various experimental trials suggests that lutein may play a protective role on the circulatory and cardiovascular systems. Its antioxidant activity may also extend to the heart, skin, lungs and blood vessels, making it a nutrient with diverse clinical benefits. Lutein possesses the ability to promote the health of many body tissues.8 Safety Suggested Adult Use: One capsule daily, or as directed by a health care professional. Take with or without food.
Scientific References 2. Bowen PE, et al. Esterification does not impair lutein bioavailability in humans. J Nutr. 2002 December; 132: 3668-3673. 3. Berendschot TT, et al. Lens aging in relation to nutritional determinants and possible risk factors for age-related cataract. Arch Opthalmol. 2002 Dec; 120(12): 1732-7. 4. Richer S, et al. Double-masked, placebo-controlled, randomized trial of lutein and antioxidant supplementation in the intervention of atrophic age-related macular degeneration: the Veterans LAST study (Lutein Antioxidant Supplementation Trial). Optometry. 2004 Apr; 75(4): 216-230. 5. "Lutein and Zeaxanthin". PDR Health. 6. Chitchumroonchokchai C, et al. Xanthophylls and alpha-tocopherol decrease UVB-induced lipid peroxidation and stress signaling in human lens epithelial cells. J Nutr. 2004 Dec; 134(12): 3225-32. 7. Krinsky NI. Possible biologic mechanisms for a protective role of xanthophylls. J Nutr. 2002; 132: 540S-542S. 8. Mares-Perlman JA, et al. The body of evidence to support a protective role for lutein and zeaxanthin in delaying chronic disease. Overview. J Nutr. 2002; 132: 518S-524S.
(https://vitanetonline.com:443/forums/Index.cfm?CFApp=1&Message_ID=696) Lutein 6mg, 20mg, help stop macular degeneration ... 
Date:
June 02, 2005 01:39 PM
One of the more surprising discoveries of modern nutritional science is that the very pigments which give brilliant color to our fruits and vegetables are powerful nutrients which can protect us from the rigors of time and environment. Lutein is one of the most recent discoveries in this field. In our diets, it’s found most abundantly in dark green leafy vegetables such as spinach, collards and kale. Like beta-carotene, lutein is a powerful antioxidant which studies show can contribute to the protection of cells. But the most promising application of lutein may be its beneficial influence on the eyes, particularly in regard to macular degeneration. Source Naturals LUTEIN is a concentrated source of this important natural nutrient. Like the beta-carotene that makes carrots orange and the lycopene that makes tomatoes red, lutein is a carotenoid. It is the pigment that makes corn yellow, and gives marigolds their brilliant golden color. One of the most interesting aspects of the way carotenoids interact with the human body – beyond their broad spectrum antioxidant activity – is their tendency to be “organ specific.” Different carotenoids have an affinity for different organs in the body. In the case of lutein, it is found concentrated in the structure of our eyes. Vision and Macular Health The process of vision involves light being focused through the lens and onto the retina, the paper-thin tissue lining the back of the eyeball. The central portion of the retina, called the macula, receives the most light. Its millions of cells produce the sharp vision needed to read and see objects clearly. With age, tiny blood vessels grow over this area, causing a gradual distortion and loss of vision. This degeneration of the macular region of the retina is the leading cause of irreversible visual impairment in the USA today. It affects almost 20% of people past the age of 65. Research has shown that these people have lower than normal amounts of macular pigment, which suggests the protective role played by these pigments. In fact, the latest research suggests that low levels of macular pigment is a cause, rather than a result, of macular deterioration. Lutein – The Eyes Have It Lutein and another carotenoid called zeaxanthin are the most dominant pigments in the macular region of the retina. (Source Naturals LUTEIN contains 5-7% zeaxanthin.) Their antioxidant properties help maintain the integrity of the blood vessels that supply the macular region of the retina: providing protection from photo-oxidation, the result of light striking the fatty acids in the retina. It seems that lutein is particularly active against the blue part of the spectrum, which can be the most damaging to our eyes. One study using lutein supplements resulted in a 15% increase in macular pigment levels after 72 days. In another study, people who consumed the equivalent of 6 mg of lutein per day were 40% less likely to experience macular problems. Another study using sets of identical twins demonstrated that macular lutein concentrations were related to dietary lutein. After consumption, lutein is found in significant quantities in blood serum, suggesting high bioavailability. Our Connection with Plants In this era of biochemistry, we’re rediscovering our vital connection with plant life. Although research into phytonutrients is relatively new, many plant compounds are being found in significant concentrations in the human body. Their presence in our blood serum, organs, and mothers’ milk suggests they play an important role in our body chemistry, and perhaps explains why we’ve appreciated them as foods throughout history. Like many carotenoids, lutein has evolved as an integral part of human biochemistry, with many benefits to our well-being. Since mammals cannot synthesize it, lutein must be obtained from the diet. Source Naturals LUTEIN is extracted from specially grown marigold flowers high in Lutein, and purified by an exclusive patented process. So the next time you bathe your eyes in a golden bouquet of marigolds, remember their beauty really is in the eye of the beholder.
References
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Macular degeneration is a medical condition that affects older adults in most cases which results in a loss of sight or vision just in the center of the visual field due to damage of the retina. This is a very serious condition of the eye and it progresses over the years and in case left untreated may lead to further loss of sight. It has been found to be a major cause of older adults being visually impaired and usually age range is 50 years or older. Macular degeneration makes it hard or impossible to read or recognize faces, even though enough peripheral vision remains to make daily life activities remain doable. 
case that increased green leafy vegetable consumption does help prevent the risk of AMD. Sufficient lutein intake indicates risk reduction for macular degeneration and this can be obtained from a proper diet, but considering that the daily focus of attention is for the lutein. 
