Balance your hormone pathways naturally. Source Naturals® DIM 100 mg delivers concentrated diindolylmethane—the active compound found in cruciferous vegetables like broccoli and Brussels sprouts—enhanced with soy lecithin, vitamin E, and patented BioPerine® to ensure your body actually absorbs every milligram.
Clinical Trust & Assurance: Every batch is manufactured under strict cGMP standards and verified for purity and potency. Our editorial reviews synthesize peer-reviewed clinical findings to help you make informed decisions about your endocrine wellness.
What Is DIM and Why Does Your Body Need It?
When you eat cruciferous vegetables such as broccoli, cauliflower, cabbage, and kale, your stomach acid breaks down a nutrient called indole-3-carbinol (I3C) into diindolylmethane (DIM). Scientific evaluations show that DIM is the primary substance responsible for the health-protecting benefits of these vegetables.
However, getting a clinically meaningful amount of DIM from diet alone is difficult. To obtain 100 mg of active DIM, you would need to eat roughly two pounds of raw cruciferous vegetables every single day. Source Naturals® DIM (Diindolylmethane) 100 mg provides a pure, shelf-stable, and convenient daily serving in just one vegetarian tablet.
✓Encourages Balanced Estrogen: Directs estrogen down healthy metabolic pathways in both women and men.
✓Supports Cellular & Tissue Health: Protects breast, cervical, and prostate tissues from aggressive estrogen metabolites.
✓Helps Address Estrogen Dominance: Aids in clearing heavy estrogen buildup that can cause monthly breast tenderness, mood swings, stubborn midsection weight, and hormonal acne.
✓Prostate & Fitness Support for Men: Keeps estrogen in check to promote a healthy free testosterone-to-estrogen ratio.
How DIM Works: The Science of "Good" vs. "Bad" Estrogen
Estrogen is not a single hormone, and it is not only for women. Both men and women produce estrogens that must eventually be broken down (metabolized) by the liver and eliminated. Think of your liver as a sorting facility with two different conveyor belts:
Conveyor Belt 1: 2-Hydroxyestrone (The Protective Pathway)
Often nicknamed "good estrogen," 2-hydroxyestrone (2-OHE1) has very weak hormonal activity and powerful antioxidant properties. It exits the body smoothly without over-stimulating cells or causing unwanted tissue growth.
Conveyor Belt 2: 16-Alpha-Hydroxyestrone & 4-Hydroxyestrone (The Reactive Pathways)
Known as "proliferative estrogens," 16α-hydroxyestrone (16α-OHE1) and 4-hydroxyestrone (4-OHE1) remain biologically aggressive. High concentrations can cause breast tenderness, water retention, and excessive cellular stimulation in hormone-sensitive tissues.
Where DIM steps in: DIM acts like a traffic controller inside your liver. By activating specific cytochrome P450 enzymes (particularly CYP1A2), DIM steers estrogen away from the 16-alpha pathway and shifts it toward the protective 2-hydroxy pathway. This increases your 2:16 hydroxyestrone ratio, a biological marker closely associated with long-term breast, uterine, and prostate wellness.
The Bioavailability Advantage: Why Source Naturals® Formulated DIM with BioPerine® & Lecithin
Pure, crystalline DIM is naturally water-insoluble (hydrophobic). In plain powder form, its crystalline structure resists dissolution in stomach fluid, leading to low intestinal absorption and rapid elimination before it reaches your bloodstream.
Source Naturals solves this absorption roadblock with a synergistic co-factor matrix:
1. Soy Lecithin Phospholipids (100 mg)
Phospholipids naturally encapsulate the DIM molecules, forming microscopic lipid complexes (micelles) that easily glide through intestinal cell walls for higher uptake.
2. Vitamin E (as d-alpha tocopheryl succinate, 50 IU)
A fat-soluble antioxidant that protects active phytochemicals from premature oxidation while providing essential cellular protection.
3. BioPerine® Black Pepper Fruit Extract (3 mg)
Standardized to 95% piperine, BioPerine® stimulates gastrointestinal blood flow and temporarily relaxes active efflux pumps, significantly increasing the bio-availability of botanical compounds.
Clinical Evidence & Peer-Reviewed Research
DIM is one of the most thoroughly investigated plant-derived compounds in modern nutritional science. The effectiveness of DIM on estrogen conversion has been confirmed in multiple clinical human trials:
Estrogen Metabolite Rebalancing in Women
In a landmark randomized, double-blind, placebo-controlled trial published in Breast Cancer Research and Treatment, daily oral DIM supplementation produced a statistically significant increase in the beneficial 2-OHE1/16α-OHE1 ratio (+3.2 in the DIM group vs. -0.7 in the placebo group; p < 0.001) as well as significant increases in circulating sex hormone-binding globulin (SHBG).
Citation: Thomson CA, et al. Breast Cancer Res Treat. 2017;165(1):97-107. doi:10.1007/s10549-017-4293-6.
Thyroid & Endocrine Tissue Hormone Modulation
A clinical pilot study published in the journal Thyroid evaluated the systemic activity of oral DIM. The investigators observed a marked elevation in systemic 2-OHE levels across participants, alongside a substantial decrease in reactive 16α-OHE1 metabolites, validating DIM's role as a potent modulator of hormonal metabolism in sensitive tissues.
Citation: Rajoria S, et al. Thyroid. 2011;21(3):299-304. doi:10.1089/thy.2010.0245.
Prostate Cellular Regulation in Men
Research investigating diindolylmethane in prostate tissues demonstrates that DIM acts as an androgen-receptor antagonist and promotes healthy apoptotic cycles in abnormal cells, providing targeted nutritional support for aging men experiencing elevated estrogen-to-androgen conversions.
Citation: Beaver LM, et al. Toxicol Appl Pharmacol. 2012;263(3):345-351. doi:10.1016/j.taap.2012.07.007.
Who Benefits from DIM (Diindolylmethane) 100 mg?
For Women: Hormonal Harmony, Cycle Comfort & Clear Skin
Women struggling with monthly mood changes, cyclical breast soreness, perimenopausal hot flashes, or cyclical jawline acne often experience relative "estrogen dominance." DIM helps the liver flush spent estrogens, promoting calmer cycles, improved physical comfort, and clearer skin.
For Men: Prostate Health, Lean Muscle & Estrogen Control
As men age, testosterone naturally declines while estrogen levels often climb through aromatization (conversion of androgens to estrogens in body fat). Elevated estrogen in men can contribute to sluggish metabolism, fat accumulation around the chest and waist, and urinary urgency. DIM supports healthy estrogen clearance to help maintain lean body mass and protect prostate health.
Complete Supplement Facts & Ingredients
Supplement Facts
Serving Size: 1 Tablet
Servings Per Container: 60
Amount Per Serving
% Daily Value
Vitamin E (as d-alpha tocopheryl succinate) 50 IU (34 mg)
227%
Diindolylmethane (DIM)
100 mg †
Lecithin (from soybeans)
100 mg †
Black Pepper Fruit Extract (BioPerine®)
3 mg †
† Daily Value (DV) not established.
Other Ingredients: Microcrystalline cellulose, stearic acid, silica, and magnesium stearate.
Allergen Information: Contains soy (lecithin). Contains no yeast, dairy, egg, gluten, or wheat. Free of sugar, starch, salt, preservatives, artificial colors, artificial flavors, and fragrances.
Dietary Suitability: Suitable for vegetarians.
Suggested Use: Take 1 tablet 1 to 4 times daily with meals, or as recommended by your healthcare professional. Safety Cautions: Do not take this product if you are pregnant, planning to become pregnant, or breastfeeding. Do not take if you are currently using immunosuppressive therapies or prescription hormone modulators (such as tamoxifen) without consulting your prescribing physician. Keep out of reach of children.
Frequently Asked Questions (FAQ)
What is DIM and how does it help balance hormones?
DIM (diindolylmethane) is a natural food-derived plant compound produced during the digestion of cruciferous vegetables. It does not replace your hormones; rather, it works with your liver's enzymes to guide the breakdown of estrogen down the healthy, protective 2-hydroxy pathway, helping clear out over-stimulating estrogen byproducts.
Why are BioPerine® and Lecithin added to Source Naturals DIM 100 mg?
Raw crystalline DIM is fat-soluble and does not dissolve easily in the digestive tract. Source Naturals combines DIM with soy lecithin phospholipids to emulsify the particles and BioPerine® (black pepper extract) to stimulate active absorption, ensuring maximum cellular delivery and potency.
Can both men and women take DIM supplements?
Yes. While women often take DIM for breast comfort, cyclical acne, and menstrual regularity, men use DIM to avoid unwanted estrogen buildup. In men, excessive estrogen can compete with testosterone, leading to midsection weight gain, sluggish recovery, and prostate strain. DIM assists men in maintaining a favorable testosterone-to-estrogen ratio.
Why does my urine turn dark amber or orange after taking DIM?
This is a completely normal, harmless occurrence. As DIM stimulates the breakdown and elimination of estrogen, the natural oxidized color of DIM metabolites is excreted through the kidneys, giving urine a darker amber, orange, or reddish tint. Drinking plenty of water throughout the day will lighten the color.
What is the difference between DIM and Indole-3-Carbinol (I3C)?
Indole-3-Carbinol (I3C) is the parent molecule in vegetables, but it is unstable and must combine with strong stomach acids to turn into DIM. If your stomach acid is low or variable, I3C can convert into unwanted byproducts. Taking DIM directly bypasses this step, delivering the exact, stable active compound your body needs.
How long does it take for Source Naturals DIM to start working?
Changes in urinary estrogen metabolite ratios can occur within 10 to 14 days of consistent daily use. Noticeable physical benefits—such as improvements in hormonal skin clarity, reduced breast tenderness, and smoother menstrual cycles—typically become apparent after 4 to 8 weeks of regular supplementation.
