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Allergic reactions to GHK-Cu are uncommon but can occur, particularly in individuals with sensitivities to copper or related compounds
Pyridoxine: Pyridoxine (vitamin B 6 ), either alone or combined with doxylamine, has been used to prevent nausea and vomiting
Stable vitamin C derivatives (ascorbyl glucoside, MAP / magnesium ascorbyl phosphate) operate at neutral pH and can be layered with GHK-Cu without conflict
A 500 mcg dose from a verified 503A pharmacy delivers 500 mcg of active peptide
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