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Forward-Looking Statements: This article reflects information available in August 2026

The verdict: in most situation, vitamin B12 likely has no effect on hair loss (and hair regrowth), but vitamin B12 might reverse premature hair graying in the presence of B12 deficiency Although hypothetical evidence suggests an absence of B12 activity could negatively impact hair growth, in vivo human studies indicate that either (1) there is no relationship between vitamin B12 deficiency and hair loss and/or (2) there is an overriding factor (like methionine provision outside of the methylation cycle) that prevents B12 deficiency from causing hair loss

We thank Tanja Kuhlmann for critical feedback

doi:10.1001/jamaneurol.2013.1425

Action and therapeutic potential of oxyntomodulin

GLP-1 medications such as Ozempic, Wegovy, Mounjaro, and Zepbound continue to grow in popularity among patients in Long Island and throughout New York