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What vitamin deficiency causes hair loss?

Several vitamin deficiencies may contribute to hair loss, including vitamin D, vitamin B12, and less commonly biotin. These nutrients play roles in normal hair follicle function and the hair growth cycle. However, deficiencies are not the most common cause of hair loss, and other factors such as genetics and hormonal changes are often involved. Vitamin D deficiency is relatively common in the UK due to limited sunlight exposure.

Key points:

• Vitamin D deficiency has been associated with certain types of hair loss and may affect the hair growth cycle.
• Vitamin B12 deficiency can contribute to hair shedding, particularly in cases of anaemia.
• Biotin deficiency is rare but may lead to hair thinning when present.
• Excess vitamin A, rather than deficiency, is more commonly linked to hair loss.

This text has been fact-checked for accuracy by Sorin Romaniuc, Pharmacist at medino.