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Methylcobalamin is the biologically active form
GHK-Cu is a copper-binding tripeptide complex used in experimental research to study cellular signaling, peptide-copper interactions, and gene-expression responses
Whether meaningful quantities reach systemic circulation remains unestablished which means an oral result in a gut model says little about oral efficacy in a tendon model
This sublingual-like absorption route theoretically allows the peptide to enter the bloodstream more directly, avoiding first-pass metabolism in the liver and enzymatic degradation in the stomach
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