DHT-Modulating — for androgenetic (pattern) hair loss
For male and female pattern hair loss driven by DHT sensitivity, saw palmetto and pumpkin seed oil have the most evidence among supplements. Effects are smaller than finasteride but real.
Foundation Nutrients — fix deficiencies first
Iron deficiency, low ferritin, zinc deficiency, and biotin deficiency all cause hair loss and respond to supplementation. If you have not had bloodwork, this is the most cost-effective starting point.
Hair-Specific Bioactives
These ingredients have RCT data specifically for hair density, thickness, or growth — modest effects but better evidence than generic "hair vitamins."
Botanical Hair Support
Traditional and emerging botanicals with hair-growth claims. Evidence is preliminary; reasonable as adjuncts when first-line options are inadequate.
General Hair Health Formulas
Multi-ingredient hair formulas marketed for general hair quality. Most rely on ingredients addressed above; choose based on transparency about active doses rather than ingredient count.
Frequently Asked Questions
What is the best supplement for hair loss?
It depends on the cause. For genetic pattern hair loss (androgenetic alopecia), saw palmetto has the most supplement evidence — modest but real effects on hair density. For deficiency-driven hair loss, fix iron, ferritin, zinc, vitamin D, and biotin if low. For age-related thinning in women, marine collagen peptides (especially Verisol) have RCT evidence. None of these match the effect size of FDA-approved minoxidil or finasteride.
Does biotin actually work for hair loss?
Only if you are biotin-deficient — which is rare in healthy adults eating a varied diet. Biotin deficiency does cause hair loss, and supplementation reverses it. But the popular "biotin for thick hair" framing is largely marketing — most people taking biotin already have plenty. Important caveat: high-dose biotin interferes with thyroid and cardiac lab tests — tell your doctor before any blood draw.
What is the difference between supplements and minoxidil/finasteride?
Effect size. FDA-approved treatments (minoxidil 5% topical, oral finasteride 1 mg) produce hair density increases of 10-30% in trials. Supplements like saw palmetto produce maybe 5-10%. The supplements have better tolerability and no sexual side effects, but if you want maximum hair regrowth, FDA-approved treatments under physician guidance are more effective.
Can supplements regrow hair I have already lost?
Supplements cannot revive dead follicles. They can help prolong the active growth phase of remaining follicles, slow further loss, and modestly improve density of existing hair. If hair has been gone for years, no supplement (and few prescription treatments) will bring it back. This is why early intervention matters for hair loss — start treatment when you first notice thinning, not after years of progression.
Should I get bloodwork before trying hair supplements?
Yes. Iron deficiency, low ferritin (below 70 ng/mL even if technically "normal"), zinc deficiency, vitamin D deficiency, and thyroid dysfunction all cause hair loss and are easily detected. Fixing these is cheaper, faster, and more effective than years of speculative supplements. Get a CBC, ferritin, iron studies, vitamin D, zinc, and TSH before spending heavily on hair products.
When should I see a dermatologist?
See a dermatologist for sudden or patchy hair loss, hair loss with scalp itching/burning/scarring, hair loss in someone under 25, or hair loss that has not responded to nutrient correction and 6 months of supplement trials. A dermatologist can diagnose the specific type (androgenetic, telogen effluvium, alopecia areata, scarring alopecia) and prescribe the right treatments. Pattern matters far more than supplement choice.