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GHK-Cu (Copper Peptide): Known for its role in skin repair and collagen synthesis
Glutathione tablets offer various health benefits beyond skin improvements
Native human IGF-1 is a 70-residue single-chain protein with an insulin-like fold: A and B domains homologous to the insulin A and B chains, joined by a C domain that is retained rather than excised as insulin's C-peptide is, plus a short D extension
PMC 4476766
For private-label brands, the best choice is not simply which ingredient is stronger. It is which ingredient form matches the target claim, serving size, dosage form, flavor system, market regulations and final product cost
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