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Sometimes referred to as the sunshine vitamin, vitamin D3 promotes the actions of serotonin, dopamine, and other key brain neurotransmitters

(1) More specifically, the tripeptide sequence composed of glycine, histidine, and lysine, abbreviated as Gly-His-Lys, may be derived during the breakdown of collagen through hydrolysis

[7] Because the peptide was delivered by injection into an implanted tissue compartment, this line of work is the closest thing the field has to a controlled, injected-delivery model of GHK-Cus repair activity

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Methylmalonic acid is especially helpful when standard B12 levels appear falsely elevated but symptoms remain