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Testing also gives you a baseline to measure against later
When B12 is deficient, melanin production may be affected, leading to premature loss of hair colour
Methods We searched four electronic databases (PubMed, Scopus, Web of Science, and Cochrane CENTRAL Register of Controlled Trials)
AHK-Cu emerged later as researchers explored variations on the original copper-binding tripeptide structure, swapping the glycine residue for alanine to see how the change affected biological activity
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