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Association of biochemical B 12 deficiency with metformin therapy and vitamin B 12 supplements: The National Health and Nutrition Examination Survey, 1999-2006 Diabetes Care
April 22, 2026: Removed from Category 2 On April 15, 2026, the FDA published a 503A category revision removing 12 peptides from Category 2 effective seven calendar days later (April 22)
Dosing both at the same time of day compounds nausea risk
Localized site discoloration at high-dose repeated injection Sparse community reports describe faint bluish or brownish discoloration at sites injected repeatedly with high-dose GHK-Cu (above community-typical doses)
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