This damage is invisible, you cannot see it, but your body will notice reduced efficacy
User reports frequently mention improved hair texture alongside regrowth, though controlled studies comparing hair quality metrics remain limited
However, "unlike most other vitamins, B12 is stored in substantial amounts, mainly in the liver, until it is needed by the body," according to Merck Manuals Consumer Version
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Some peptides are dosed individually based on response, which can affect vial duration