BioStacks

Best Vitamin D for Hair

Top 10 products ranked

Last reviewed May 2026

Clinical dose: 1000–5000 IU

Why Vitamin D for Hair

Vitamin D plays a supporting role in hair. Essential for calcium absorption, bone health, immune regulation, and gene expression. Vitamin D3 (cholecalciferol) is significantly more effective than D2 (ergocalciferol) at raising and maintaining blood levels, making it the preferred supplemental form.

What dose to look for

Clinical studies typically use 1000–5000 IU of vitamin d. Clinical consensus supports 1000–5000 IU/day; RDA of 600 IU is considered conservative. Products below this range may not deliver meaningful results.

What form to look for

Avoid ergocalciferol — d2 — less effective than d3. Avoid vitamin d2 — less effective than d3. Look for cholecalciferol (d3) for better absorption.

What the research says

Vitamin D has strong clinical evidence for hair benefits. Meta-analyses of 81+ trials confirm bone health benefits; immune and mood claims have mixed results Learn more

Clinical research on Vitamin D

LOW — association only, no supplementation RCTs · 1,000–4,000 IU/day

•Low vitamin D levels associated with alopecia areata, telogen effluvium, and female pattern hair loss in observational studies
•Vitamin D receptors are present in hair follicles and involved in hair cycle regulation
•No RCTs demonstrating that supplementation treats hair loss when not deficient

See full Hair research →

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vitamin d3 · 1000 IU