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doi: 10.1038/nm.3761 36 JallSSachsSClemmensenCFinanBNeffFDiMarchiRDet al
That being said, vitamin B12 deficiency can still cause real problems and, in some cases, may be an underlying factor in premature hair graying
B12 supplementation will only help your hair if deficiency is genuinely contributing to the problem
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Appetite, mitochondrial signaling, GH response, and visceral-fat distribution are different questions
Those with severe deficiency may need more frequent injections at first
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