Top 5 Best Ways To BoostHair GrowthRanked (2026)
Thicker hair, less shedding — the supplements that actually move the needle (and the honest truth about the ones that don't, like biotin).
Ranked Solutions
Ranked by how much each one actually moves the needle — our SAC Efficacy Score™, explained further down.
- Coming soonFull guide in progress#1
Saw Palmetto
Supplementblocks DHT → modest regrowth in pattern hair loss
⚑ for hormonal (pattern) hair loss- 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.
- #2
Zinc
Supplementstops deficiency-driven shedding when a low level is corrected
⚑ only if deficient- 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.
- Coming soonFull guide in progress#3
Iron (Ferritin)
Supplementregrows diffuse-shedding hair when low ferritin is corrected
⚑ only if ferritin is low (common in women)- 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.
- #4
Collagen
Supplementsupporting role for hair thickness; early, modest evidence
- 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.
- Coming soonFull guide in progress#5
Biotin
Supplementonly works if you're biotin-deficient (rare) — overhyped otherwise
⚑ deficiency only- 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.
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.
Deep-Dive Product Reviews
Single-product investigations — what the brand claims, what our testing actually found, and whether it's worth your money.
Vital Proteins Collagen Peptides Review
The safe default collagen tub for skin and general connective tissue.
Thorne Collagen Plus Review
The skin use case done properly — peptides plus the cofactor in one scoop.
Sports Research Marine Collagen Peptides Review
The cleanest marine collagen — for fish-source and pescatarian buyers.
Ancient Nutrition Multi Collagen Protein Review
The broadest coverage in one scoop — for the buyer who doesn't want to choose.
NOW Collagen Peptides Review
Real type I/III peptides at the lowest cost-per-gram on the list.
NOW UC-II Undenatured Type II Collagen Review
The osteoarthritis pick — 40 mg of a genuinely different mechanism.
Garden of Life Grass Fed Collagen Peptides Review
The sourcing-certification pick — certified grass-fed, full dose, cofactor built in.
Live Conscious Collagen Peptides Review
The complete beauty scoop at a value price — vitamin C done right, biotin oversold.
Sports Research Collagen Peptides (Bovine) Review
The clean-label, certification-forward bovine peptide.
Orgain Collagen Peptides Review
The dependable, widely-stocked generalist — good, just not category-leading.