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CDC injection-safety guidance On February 27, 2026, HHS Secretary Kennedy announced that GHK-Cu is among approximately 14 peptides expected to return to Category 1
Pause retinol, AHAs, BHAs, vitamin C (L-ascorbic), and benzoyl peroxide for 48 hours before and 72 hours after
For the peptides under consideration, the small size of the copper tripeptide (3 amino acids), the thymosin fragment (7 amino acids), and the body protection compound (15 amino acids) likely limits benzyl alcohol interactions compared to larger proteins
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However, certain physiological changes associated with GLP-1 receptor agonistsincluding reduced fluid intake, weight loss, and metabolic shiftsmay theoretically increase kidney stone risk in predisposed individuals