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Human clinical trials have primarily focused on skin rejuvenation rather than hair growth specifically, though the mechanisms overlap significantly

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Methylcobalamin, vitamin B12 preparations containing benzyl alcohol should be avoided in premature neonates because benzyl alcohol has been associated with gasping syndrome, a potentially fatal condition characterized by metabolic acidosis and CNS, respiratory, circulatory, and renal dysfunction

[PMID: 718675] PubMed record related to this compound for laboratory literature review