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"Hypervitaminemia B12 in the Elderly: A Forgotten Marker of Serious Underlying Diseases"

It plays a critical role in neutralizing free radicals (unstable molecules that can damage cells)

In a 2019 study published in NCBI, titled "The Role of Vitamins and Minerals in Hair Loss: A Review," researchers stated that "vitamin B12 [is one] of the vitamins and minerals that may be involved in hair graying/whitening during childhood or early adulthood

Additionally, repeated use and withdrawal can result in persistent overactivation of the HPA axis, causing elevated cortisol levels and disrupted negative feedback mechanisms 68,69,70,71