Vitamin Deficiency & Hair Loss
Which deficiencies cause shedding and how to fix them.
Vitamin deficiency hair loss is real – but only with a measured deficiency, and it never explains hereditary loss.
Nutritional deficiencies — iron, vitamin D, zinc, B12 — can contribute to hair shedding.
What helps
Testing and correcting deficiency reduces shedding, but does not reverse pattern hair loss. See hair vitamins.
Which deficiencies actually cause hair loss
Documented above all are iron deficiency (measured by ferritin, common in women), vitamin D deficiency, zinc deficiency and vitamin B12 deficiency. Thyroid over- or underactivity also causes diffuse loss. Not documented is that intake beyond requirement improves growth. Too much vitamin A can itself trigger hair loss.
Measure first, then supplement
The four values before any supplement: ferritin, vitamin D, zinc, TSH – plus B12 for sudden loss. The FDA also warns that high-dose biotin can distort lab results, including troponin in heart-attack diagnostics and thyroid values. Stop it before blood tests as advised.
What a deficiency does not explain
Hereditary loss at hairline, temples and crown is hormonal and genetic – no supplement changes it. Using vitamins there wastes time in which medical stabilisation could work. See stress hair loss and medication vs. transplant.
This page is for general information and does not replace medical advice. Results are individual and cannot be guaranteed.
vitamin deficiency hair loss: key points
Documented are iron, vitamin D, zinc and B12 deficiency and thyroid disorders. Four values belong before any supplement: ferritin, vitamin D, zinc, TSH.
High-dose biotin can distort lab results, including heart-attack diagnostics.
For the full overview, see our main page on hair transplants in Istanbul.
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