These are more common after your first injection and tend to improve over time
Source: STEP 1 Clinical Trial (N Engl J Med 2021)
Formulators and analytical chemists should note that the copper-chelated GHK-Cu component imparts a characteristic blue tint upon reconstitution and requires attention to buffer selection, pH range, and avoidance of strong reducing or chelating agents that can perturb the copper coordination sphere
Concurrently, pivotal metabolic enzymes within the amino acid synthesis pathway, including glutamate-oxaloacetate transaminase 1 (GOT1), glutamate-pyruvate transaminase 2 (GPT2), pyrrolidine-5-carboxylic acid reductase 1 (PYCR1), and phosphoserine aminotransferase 1 (PSAT1), demonstrated increased expression [214]
For hangover support, as a minimum, you want a dose that is within the lower-to-mid hundreds of milligrams