Supplements for hair loss

Honest, evidence-graded picks. Most "hair growth" supplements are oversold; a few have a real role in deficiency-driven shedding and androgenic alopecia.

Hair loss has multiple causes — androgenic alopecia (the most common, "male/female pattern"), telogen effluvium (stress- or illness-triggered diffuse shedding), nutritional deficiency-driven shedding, autoimmune (alopecia areata), traction, and others. Supplement strategy is dramatically more effective when matched to cause. The big-picture summary: in androgenic alopecia, FDA-approved minoxidil (topical) and finasteride/dutasteride (oral, men) outperform any supplement; saw palmetto has modest signals as an adjunct. In nutritional shedding, replete the deficiency. The "hair, skin, and nails" gummies are mostly biotin (which only helps the rare biotin-deficient patient) plus marketing.

Ferrous bisglycinate (gentle iron)

Iron repletion if low ferritin · Telogen effluvium

Tier 1

Vitamin D3

Hair cycle · Often low in alopecia areata

Tier 1

Zinc (in deficiency)

Hair shedding · Use only if low

Tier 2

Saw palmetto (Serenoa repens)

Androgenic alopecia adjunct (modest)

Tier 3

Collagen peptides

Skin · Hair cosmetic outcomes (small)

Tier 1

Omega-3 (EPA/DHA)

Hair density (small signals) · Scalp inflammation

Tier 1

Biotin (in confirmed deficiency only)

Hair · Lab interference risk

Tier 3

L-Theanine + general stress modulation

Stress-related telogen effluvium

Tier 2

The hair-loss stack — rationale by cause

If telogen effluvium / diffuse shedding: address ferritin, vitamin D, thyroid first

Diffuse shedding 2–3 months after a triggering event (illness, surgery, severe diet, postpartum, major stress) is almost always self-limited but can be perpetuated by deficiencies. Test ferritin (target ≥40 ng/mL for hair regrowth), 25-OH-D (target 30–50 ng/mL), TSH, and ferrous bisglycinate or sulfate if iron is low. Hair recovery follows ferritin recovery on a months-long timescale.

If androgenic alopecia (men): minoxidil + finasteride are first-line, not supplements

Topical minoxidil 5% twice daily and oral finasteride 1 mg/day have decades of FDA-approved trial evidence for hair density preservation and modest regrowth. Saw palmetto (320 mg/day standardised) has a 5α-reductase inhibition mechanism similar to finasteride at much smaller magnitude — reasonable as an adjunct or for men who decline finasteride, but expectations should match the modest effect size.

If androgenic alopecia (women): different toolkit

Topical minoxidil 5% (typically once daily in women), oral spironolactone (off-label, by dermatologist), and PRP injections lead the female pattern hair loss management. Iron repletion to ferritin ≥70 ng/mL is often more impactful than the same intervention in men. Discuss with a dermatologist before stacking supplements.

If alopecia areata: see a dermatologist

This is autoimmune, not supplement-responsive. JAK inhibitors (oral baricitinib for severe disease, topical and intralesional steroids for limited disease) are the modern treatments. Vitamin D repletion is reasonable adjunct given association data, but supplements are not the treatment.

Collagen peptides 10–15 g/day

Modest signals in skin and hair cosmetic outcomes; the trial weight is stronger for skin endpoints than hair endpoints. Reasonable in users who tolerate it; not a substitute for the items above.

Omega-3 EPA/DHA 1–2 g/day

Small signals on hair density; better-evidenced for general scalp health and anti-inflammatory background. Layer on top of cause-directed treatment.

What to skip

High-dose biotin (10,000 mcg gummies) without confirmed deficiency — biotin deficiency is rare; supplementation in non-deficient people doesn't grow hair. Important: high-dose biotin meaningfully interferes with many laboratory immunoassays (troponin, thyroid function tests, hCG), which has caused missed heart attacks and incorrect thyroid management. Stop biotin at least 72 hours before any blood work.
Generic "hair, skin, and nails" multivitamin gummies — typically include sub-therapeutic amounts of multiple ingredients with marketing emphasis on biotin. Pay for cause-targeted single ingredients instead.
"Hair growth" stacks containing tongkat ali, fadogia, or testosterone-modulating herbs — increased androgen activity is the wrong direction in androgenic alopecia in genetically susceptible individuals.
Mega-dose vitamin A retinol — chronic high-dose vitamin A is associated with hair loss, paradoxically; a "more is better" approach to A is exactly wrong here.
Pumpkin seed oil supplements as a finasteride substitute — limited and methodologically weak trial evidence, mostly from a single research group; not the right comparator for documented androgenic alopecia.

Educational reference, not medical advice. Hair loss benefits from a dermatology evaluation to characterise type — especially before committing to a long supplement protocol that may not match the cause. Discuss any supplement change with a qualified clinician.

Sources

Almohanna HM, et al. The role of vitamins and minerals in hair loss: a review. Dermatol Ther (Heidelb). 2019;9(1):51–70. PMID: 30547302
Trost LB, et al. The diagnosis and treatment of iron deficiency and its potential relationship to hair loss. J Am Acad Dermatol. 2006;54(5):824–844. PMID: 16635664
Wessagowit V, et al. Treatment of male androgenetic alopecia with topical products containing Serenoa repens extract. Australas J Dermatol. 2016;57(3):e76–e82. PMID: 26172226
Rajput RJ. Cochrane review on saw palmetto for benign prostatic hyperplasia symptoms. Cochrane Database Syst Rev. 2012;12:CD001423. PMID: 23235553
Le Floc'h C, et al. Effect of a nutritional supplement on hair loss in women. J Cosmet Dermatol. 2015;14(1):76–82. PMID: 25573272
Patel DP, et al. A review of the use of biotin for hair loss. Skin Appendage Disord. 2017;3(3):166–169. PMID: 28879195