Severe chronic constipation of young women: 'idiopathic slow transit constipation'
As of July 26, 2026, 21 CFR 216.23 lists six substances that can be used through this pathway: Brilliant Blue G, cantharidin for topical use only, diphenylcyclopropenone for topical use only, N-acetyl-D-glucosamine for topical use only, squaric acid dibutyl ester for topical use only, and thymol iodide for topical use only
Its molecular target is nicotinamide N-methyltransferase (NNMT), a cytosolic S-adenosyl-L-methionine-dependent methyltransferase that converts nicotinamide to 1-methylnicotinamide, consuming SAM and releasing S-adenosylhomocysteine
Quick answer In the research literature, the 50 mg GHK-Cu vial is generally reconstituted with 3 mL of bacteriostatic water, and documented research protocols reference roughly 1 mg per dose drawn from that reconstituted solution