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R Many chronically ill individuals are functionally glycine-deficient because demand exceeds endogenous synthesis and dietary intake
doi: 10.1111/j.1532-5415.1988.tb04397.x 27 InfanteMLeoniMCaprioMFabbriA
Key Takeaways GHK-Cu (glycyl-L-histidyl-L-lysine copper complex) has a molecular weight of roughly 340 Da, placing it below the theoretical 500 Da skin-penetration cutoff, but real-world dermal delivery without a penetration enhancer is limited and superficial
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