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The connection between B12 deficiency and early greying is the most robustly supported hair-related finding in the literature

But long-term safety should be monitored by a healthcare provider, particularly if you have underlying conditions or take medications that interact

[DOI] [PubMed] [Google Scholar] 38.Snow V, Barry P, Fitterman N, Qaseem A, Weiss K

A deficiency may cause hair loss, but extra B12 only helps if levels are low

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