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A large proportion come from China, where imports of hormone and peptide compounds have increased dramatically: US customs data shows they hit $328m in the first three-quarters of 2025, up from $164m in the same period the previous year, the New York Times reported

An Update on Glutathione's Biosynthesis, Metabolism, Functions, and Medicinal Purposes [PMID: 37921175] Laboratory literature summary: An Update on Glutathione's Biosynthesis, Metabolism, Functions, and Medicinal Purposes

Daily use for months to years is common practice

Whether you're just beginning to explore peptide skincare or you're refining an existing routine, understanding how ingredients such as GHK-Cu , AHK-Cu and Copper Tripeptide-1 are used can help you make more informed choices

Convenience: Capsules Are Easier, But Easier Is Not Always Better Capsules are simpler

Occult cancer cells may persist undetected