Limited evidence. Low vitamin D is linked to several types of hair loss, and correcting a deficiency may help — but extra vitamin D above normal levels won't grow more hair.
Limited evidence — fixing a vitamin D deficiency may help shedding, but topping up beyond normal levels won't grow extra hair.
Vitamin D receptors are involved in the hair cycle, and studies link low vitamin D to telogen effluvium, female-pattern loss and alopecia areata. That makes correcting a genuine deficiency a sensible step. But the evidence is associative, and there's no good proof that pushing vitamin D above normal levels in people who aren't deficient grows more hair.
Bottom line: it's worth checking your vitamin D if you have unexplained shedding or risk factors (little sun, darker skin, indoor lifestyle), and correcting a real shortfall. Don't megadose — too much vitamin D is harmful. Treat it as one piece of the puzzle alongside proven hair-loss treatments.
← Hair-Loss Ingredient Evidence Ratings
Try the free self-check →Sources: AAD ↗
FAQ
Can low vitamin D cause hair loss?
Low vitamin D is associated with several hair-loss types, and correcting a deficiency may help shedding. It's worth testing if you have symptoms or risk factors rather than guessing.
How much vitamin D should I take for hair?
Enough to correct a confirmed deficiency, guided by a blood test and your doctor — not megadoses. Excess vitamin D is toxic, and extra beyond normal levels doesn't grow more hair.
Explore more
⚠️ When to see a doctor — don’t self-treat
- Sudden patchy or circular bald spots
- Redness, scaling, pus, pain or itch (possible scarring alopecia — treat urgently)
- Broken hairs or rapid loss
- Loss with body-wide signs (weight loss, fatigue, cycle changes, acne, extra hair)
- Loss right after a new medication
- Any hair loss in a child