Source Naturals Lignan Extract 70mg (formulated as AdaptoFem™ Lignan Extract) is an advanced, standardized botanical formulation engineered to support female endocrine balance, breast tissue integrity, and cardiovascular resilience without the use of soy. Powered by LinumLife®, a patented extract derived exclusively from the fibrous outer hull of the flaxseed (Linum usitatissimum), this supplement delivers concentrated polyphenol lignans at levels 10 to 30 times higher than conventional flaxseed oils or whole crushed seeds.
In healthy physiology, dietary lignans serve as vital precursor molecules for endogenous mammalian lignans. By providing a verified yield of secoisolariciresinol diglucoside (SDG), Source Naturals provides a reliable phytoestrogenic adaptogen that buffers hormonal fluctuations during perimenopause, menopause, and postmenopause while exerting potent free radical-scavenging activity across the vascular endothelium.
Pharmacodynamics & Biochemical Mechanism: The SDG-to-Enterolactone Pathway
Unlike synthetic hormone therapies or isolated isoflavones, flax hull lignans function through a bi-directional, adaptogenic metabolic pathway heavily dependent on the human gastrointestinal microbiome:
Deglycosylation & Microbial Transformation: Upon oral ingestion, the primary plant lignan in LinumLife®, secoisolariciresinol diglucoside (SDG), reaches the colon intact. Here, beneficial anaerobic gut microflora (including species such as Bacteroides, Clostridium, and Eggerthella lenta) hydrolyze the sugar moieties, converting SDG into secoisolariciresinol (SECO). Subsequent bacterial dehydroxylation and demethylation synthesize the primary mammalian lignans: enterodiol (ED) and enterolactone (ENL).
Selective Estrogen Receptor Modulation (SERM-like Activity): Enterolactone exhibits structural homology to 17ß-estradiol. It binds competitively to human estrogen receptors, demonstrating a preferential affinity for Estrogen Receptor-beta (ER-ß) over Estrogen Receptor-alpha (ER-a). In hyper-estrogenic biological environments, enterolignans act as weak competitive antagonists, displacing stronger endogenous estrogens and mitigating proliferative signaling. Conversely, in low-estrogen postmenopausal states, enterolignans provide gentle, non-proliferative estrogen receptor stimulation, attenuating vasomotor symptoms.
Enzymatic Modulation & Endocrine Clearing: Enterolactone exerts an inhibitory effect on key steroidogenic enzymes, including aromatase (CYP19A1) and 17ß-hydroxysteroid dehydrogenase (17ß-HSD), favoring healthy estrogen clearance toward the less active 2-hydroxyestrone pathway rather than the proliferative 16a-hydroxyestrone pathway. Furthermore, clinical trials show that flax lignans enhance liver synthesis of Sex Hormone-Binding Globulin (SHBG), helping to regulate circulating levels of unbound estrogen and dihydrotestosterone (DHT).
Flax Hull Extract (LinumLife®) vs. Standard Flaxseed Oil
A common clinical misconception among consumers is equating flaxseed oil with flax lignan supplementation. The botanical reality lies in seed morphology:
Many perimenopausal and postmenopausal women cannot tolerate soy isoflavones due to allergies, thyroid sensitivities, or dietary protocols. As a pure flax-derived source, Source Naturals AdaptoFem Lignan Extract functions as a clean, soy-free menopausal adaptogen. Peer-reviewed human trials indicate that dietary lignan supplementation helps stabilize neuroendocrine fluctuations, moderating hot flashes, night sweats, and supporting balanced neurotransmitter metabolism for emotional well-being.
2. Cellular Defense & Breast Tissue Health
Extensive epidemiological and clinical research correlates high serum enterolactone concentrations with long-term cellular integrity in estrogen-sensitive tissues. By up-regulating antioxidant response element (ARE) pathways and modulating healthy cell division cycles in mammary epithelium, SDG-derived mammalian lignans provide critical postmenopausal breast cellular defense.
The high polyphenol matrix within LinumLife® serves as a systemic antioxidant defense mechanism. Lignans suppress the production of reactive oxygen species (ROS), inhibit low-density lipoprotein (LDL) lipid peroxidation, and contribute to arterial compliance. Studies demonstrate that long-term flax hull supplementation fosters favorable blood lipid parameters and supports healthy vascular smooth muscle tone.
4. Male Hormonal Health & Prostate Homeostasis
Although frequently utilized for female hormone balance, LinumLife® flax hull extract is equally applicable for men. Clinical trials have explored LinumLife® for male endocrine balance: its ability to inhibit 5-alpha reductase (the enzyme that converts testosterone into dihydrotestosterone / DHT) and upregulate SHBG provides targeted, natural nutritional support for prostate cellular architecture and healthy lower urinary tract function.
Selected Peer-Reviewed Clinical References
Adlercreutz, H. (2007). Lignans and human health. Critical Reviews in Clinical Laboratory Sciences, 44(5-6), 483-525. [Demonstrates the conversion of dietary plant SDG into enterolactone and its multi-organ endocrine regulatory actions].
Thompson, L. U., et al. (2005). Dietary flaxseed alters tumor biological markers in postmenopausal breast cancer. Clinical Cancer Research, 11(10), 3828-3835. [Confirms daily flax lignans promote cellular apoptosis and down-regulate cell proliferation markers].
Prasad, K. (2004). Antihypercholesterolemic and antiatherosclerotic effect of secoisolariciresinol diglucoside (SDG) isolated from flaxseed. Circulation, 99(10), 1355-1362. [Documents the potent antioxidant and anti-atherosclerotic mechanisms of standardized SDG on vascular lipids].
Denis, L., et al. (1999). Diet and its preventive role in prostatic disease. European Urology, 35(5-6), 377-387. [Highlights the role of enterolactone in 5-alpha reductase inhibition and prostate cellular health].
Kanda Ishin Clinic (Tokyo, Japan) Bioavailability Pilot Study: Demonstrated that standardized LinumLife® extract exhibits high bioavailability in human subjects, significantly increasing serum levels of enterodiol and enterolactone within 24 to 48 hours of ingestion.
Complete Ingredient Listing & Supplement Facts
Manufactured under stringent Good Manufacturing Practices (cGMP) in the USA by Source Naturals®, this product contains zero artificial excipients, binders, or hidden fillers.
Supplement Facts
Serving Size: 2 Capsules Servings Per Container: 30
Amount Per Serving
% Daily Value (%DV)
Total Carbohydrate
1 g (<1%*)
Calcium (as dibasic calcium phosphate)
48 mg (4%)
Sodium
10 mg (<1%)
High Lignan Flax Hull Extract (LinumLife®) (Standardized to yield 126 mg to 140 mg Lignans)
700 mg †
* Percent Daily Values (%DV) are based on a 2,000 calorie diet.
† Daily Value not established.
Other Ingredients: Dibasic calcium phosphate, gelatin (capsule), and silica.
Allergen Declaration: Formulated without yeast, dairy, egg, gluten, soy, or wheat. Free from sugar, starch, artificial colorings, artificial flavors, preservatives, and synthetic fragrances.
Suggested Adult Use: Take 2 capsules daily with meals, or as directed by your qualified healthcare professional. Consistent daily administration for a minimum of 4–8 weeks is advised for optimal systemic adaptogenic benefits.
Clinical Precautions, Interactions & Safety Information
Pregnancy and Lactation: Do not use if you are pregnant, may become pregnant, or breastfeeding, due to the mild phytoestrogenic activity of mammalian enterolignans.
Hormone-Sensitive Conditions: Patients with estrogen receptor-positive conditions or those undergoing targeted endocrine therapy (e.g., Tamoxifen, aromatase inhibitors) should consult their oncologist or prescribing physician before starting dietary lignan supplementation.
Microbiome Dependency: Because the conversion of plant SDG into enterolactone requires active gastrointestinal bacteria, broad-spectrum oral antibiotic therapies may temporarily reduce the bioavailability and functional efficacy of lignan extracts.
Storage: Store in a cool, dry place away from direct sunlight. Do not use if tamper-evident seal is broken or missing. Keep out of reach of children.
Frequently Asked Questions (FAQ)
What is the difference between Source Naturals Lignan Extract 70mg and AdaptoFem?
They are the exact same formula. Source Naturals transitioned the product name from "Lignan Extract 70mg" to "AdaptoFem™ Lignan Extract" to highlight its clinical application as a soy-free menopausal adaptogen. Both formulations maintain SKU SN1638, providing 700 mg of LinumLife® standardized flax hull extract per 2-capsule serving (yielding approximately 63–70 mg of active secoisolariciresinol diglucoside [SDG] per capsule).
Why choose LinumLife® flax hull extract over standard flaxseed oil?
Standard cold-pressed flaxseed oil consists almost entirely of fatty acids (alpha-linolenic acid) and contains negligible amounts of lignans, as lignans are concentrated in the fibrous outer seed hull. LinumLife® is derived strictly from the flax hull, providing 10 to 30 times more lignans than whole seeds or oils, with laboratory-standardized potency in every capsule.
How does gut bacteria influence how well this lignan extract works?
Dietary flax lignans (secoisolariciresinol diglucoside / SDG) are biologically inert precursors until they reach the colon. Healthy intestinal microflora enzymatically convert SDG into mammalian enterolignans (enterodiol and enterolactone), which are absorbed into the bloodstream to modulate estrogen receptors and scavenge free radicals. Maintaining a healthy microbiome ensures optimal lignan conversion and clinical efficacy.
Can men take Source Naturals Lignan Extract 70mg?
Yes. While frequently utilized for menopausal symptoms in women, LinumLife® is widely studied for men's wellness. Flax hull lignans help modulate 5-alpha reductase activity, stimulate sex hormone-binding globulin (SHBG) synthesis, and promote cellular homeostasis in prostate tissue.
Is this product safe for individuals with soy allergies?
Yes. Source Naturals AdaptoFem Lignan Extract is 100% soy-free. It provides an effective alternative for individuals who want botanical phytoestrogenic support for menopause or cardiovascular health without using soy isoflavones such as genistein or daidzein.
How should I take Source Naturals Lignan Extract for optimal absorption?
The recommended dosage is 2 capsules daily with water, preferably taken alongside meals containing modest dietary fat. Taking the supplement with food enhances digestive transit and optimizes microbial metabolic activation in the lower intestinal tract.
