Top 5 Best Ways To Boost Hair Growth (2026)

Ranked Solutions

Ranked by how much each one actually moves the needle — our SAC Efficacy Score™, explained further down.

1. #1

   Saw Palmetto

   Supplement

   blocks DHT → modest regrowth in pattern hair loss

   ⚑ for hormonal (pattern) hair loss

   6.4/10SAC Efficacy Score™ⓘ

   • Effect size45%Moderate
   • Evidence40%Moderate
   • Reliability15%Works for many

   A natural DHT-blocker — the right lever for hormonal (pattern) hair loss, with modest regrowth in trials. Not for non-hormonal shedding. 320 mg/day.

   See the Best Saw Palmetto Supplements →
2. #2

   Zinc

   Supplement

   stops deficiency-driven shedding when a low level is corrected

   ⚑ only if deficient

   6.3/10SAC Efficacy Score™ⓘ

   • Effect size45%Modest
   • Evidence40%Moderate
   • Reliability15%Specific cases

   Zinc deficiency is a real, fixable cause of hair shedding — correcting a low level can stop the loss. Of little help if you're already replete. 15-30 mg/day.

   See the Best Zinc Supplements →What is Zinc?
3. #3

   Iron (Ferritin)

   Supplement

   regrows diffuse-shedding hair when low ferritin is corrected

   ⚑ only if ferritin is low (common in women)

   6.2/10SAC Efficacy Score™ⓘ

   • Effect size45%Modest
   • Evidence40%Moderate
   • Reliability15%Specific cases

   Low ferritin is one of the most common causes of diffuse shedding in women — restoring it regrows hair. Test first; iron isn't risk-free. Dose to your labs.

   See the Best Iron Supplements →
4. #4

   Collagen

   Supplement

   supporting role for hair thickness; early, modest evidence

   6/10SAC Efficacy Score™ⓘ

   • Effect size45%Modest
   • Evidence40%Moderate
   • Reliability15%Works for many

   Supplies amino acids for the hair shaft with early, modest evidence for thickness — a reasonable supporting player, not a primary fix. 10 g/day.

   See the Best Collagen Supplements →What is Collagen?
5. #5

   Biotin

   Supplement

   only works if you're biotin-deficient (rare) — overhyped otherwise

   ⚑ deficiency only

   5.2/10SAC Efficacy Score™ⓘ

   • Effect size45%Small
   • Evidence40%Moderate
   • Reliability15%Specific cases

   Massively overhyped — biotin only regrows hair if you're genuinely deficient, which is rare. Skip it unless a test says otherwise. 2.5-5 mg only if low.

   See the Best Biotin Supplements →

Our methodology

How every score on this page is calculated — transparent and free to cite.

Best-Of Buyer Guides

Curated product roundups for hair growth — every pick tested for evidence, quality, and price-per-active-mg.

Research & sources

The key human trials behind the rankings above — every PMID verified against its primary source.

1. ZincPrasad 1996 (testosterone) — Zinc status and serum testosterone levels of healthy adults · Nutrition · PMID 8875519
2. ZincHemilä 2017 (cold meta-analysis) — Zinc lozenges and the common cold: a meta-analysis comparing zinc acetate and zinc gluconate, and the role of zinc dosage · JRSM Open · PMID 28515951
3. CollagenLugo 2016 (UC-II, knee OA) — Efficacy and tolerability of an undenatured type II collagen supplement in modulating knee osteoarthritis symptoms: a multicenter randomized, double-blind, placebo-controlled study · Nutrition Journal · PMID 26822714
4. CollagenClark 2008 (athletes' joint pain) — 24-Week study on the use of collagen hydrolysate as a dietary supplement in athletes with activity-related joint pain · Current Medical Research and Opinion · PMID 18416885