BioStacksWhy Vitamin D for Hair
Vitamin D is a supporting nutrient for hair support. 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. As a fat-soluble vitamin, absorption improves when taken with a meal containing fat.
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. Supplements that fall short of this threshold are unlikely to match what clinical trials achieved.
What form to look for
Avoid ergocalciferol — d2 — less effective than d3. Avoid vitamin d2 — less effective than d3. For best results, choose cholecalciferol (d3).
The evidence behind vitamin d
Research supporting vitamin d for hair is rated as strong. Meta-analyses of 81+ trials confirm bone health benefits; immune and mood claims have mixed results Learn more
21st Century
Extra Strength Hair, Skin & Nails
vitamin d3 · 1000 IU
New Vitality
Super Beta Prostate
vitamin d3 · 800 IU
Mary Ruth's
Liquid Morning Multivitamin + Hair Growth Peach Mango 450ml
cholecalciferol · 800 IU
Mary Ruth's
Liquid Morning Multivitamin + Hair Growth Peach Mango 887ml
cholecalciferol · 800 IU