Human Studies Human data remain limited, and most studies are small, single-center, or use copper peptide formulations combined with other ingredients (which makes it hard to isolate GHK-Cu's specific contribution): A 2016 Lee et al
A 2016 study published in Nature Scientific Reports directly compared copper compounds and found that while copper chloride and copper acetate were highly cytotoxic, GHK-Cu showed no cytotoxicity across all tested concentrations and did not induce inflammatory markers
Falling asleep was fine, but I kept waking up at 2 or 3 AM and then just lying there, staring at the ceiling until my alarm went off
Mild bloating or early satiety , likely related to delayed gastric emptying
(At the time of writing, the FDA still hasnt approved piracetam for use in supplements or as a prescription medication, though many still take it.)3 Nootropics also technically include prescription medications like Adderall (amphetamine salt), Vyvanse (lisdexamfetamine), and Ritalin (methylphenidate),62 as well as medications for dementia and Alzheimers disease (such as memantine).63 Caffeine is also a nootropic substance and an ingredient youll find in many nootropic supplements
