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Vitamin B12 (cobalamin) participates in several fundamental cellular mechanisms: Methylation pathways cofactor for methionine synthase, influencing DNA methylation and homocysteine metabolism
A useful way to frame the difference: tretinoin is a top-down instruction that reprograms the epidermis, whereas GHK-Cu is a bottom-up supply of signal and cofactor that helps the dermis rebuild
Zinc is not naturally created in the body
Once you know the capacity, it's pretty much a plug-and-play math problem
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