Hair growth supplements are widely marketed but most have weaker evidence than claims. The strongest hair loss treatments are prescription medications (finasteride, minoxidil), not supplements. Best supplements for hair growth may help when addressing deficiencies. This guide covers what’s supported.
Address deficiencies first
Most likely to help when correcting:
- Iron deficiency (ferritin under 50-100 ng/mL)
- Vitamin D deficiency
- Zinc deficiency
- B12 deficiency
- Protein deficiency
- Thyroid disorders
Biotin — overhyped
Biotin is widely marketed for hair but evidence is poor:
- Helps only with biotin deficiency (rare)
- Most people aren’t deficient
- Excess doesn’t help non-deficient hair growth
- Can interfere with lab tests (thyroid, troponin)
Some evidence for hair
Iron: If ferritin low. Significant for women’s hair loss particularly.
Vitamin D: If deficient.
Zinc: If deficient.
Saw palmetto: Some evidence (weaker than finasteride). For male pattern hair loss.
Marine collagen: Limited evidence.
What actually works for hair loss
Prescription options with strong evidence:
- Topical minoxidil (men and women)
- Oral finasteride (men)
- Oral spironolactone (women, off-label)
- Oral minoxidil (off-label, low dose)
See dermatology evaluation for hair loss workup.
Frequently Asked Questions
Will biotin help my hair?
Only if you’re deficient (rare). Overhyped supplement.
What’s the best supplement for hair?
Address specific deficiencies. Iron particularly for women.
Does saw palmetto work?
Some evidence; weaker than finasteride.
How long until I see results?
Hair growth is slow. Need 3-6 months to evaluate effect.
Should I see a dermatologist?
For significant hair loss, yes. Treatable causes warrant proper diagnosis.
The bottom line on hair supplements
Address deficiencies. Biotin overhyped. Prescription medications more effective than supplements. See dermatology for significant hair loss.