Common side effects (minimal) Most people: No side effects GHK-Cu extremely well-tolerated Natural peptide (found in body) Minimal adverse effects Possible minor effects: Injection site stinging (common, harmless) Minor bruising at injection sites Slight blue tint to injection site (copper, temporary) Mild headache (rare) Managing side effects: Stinging: Inject slowly, warm peptide to room temp Bruising: Rotate sites, proper technique Blue tint: Normal, fades within days Headache: Hydrate well, reduce dose Contraindications and cautions Avoid if: Pregnancy or breastfeeding (no data) Active cancer (theoretical copper concerns) Wilson's disease (copper metabolism disorder) Hemochromatosis (iron overload, copper caution) Use caution with: Copper supplements (avoid taking both) High copper foods (monitor intake) Liver disease (copper metabolism) Generally safe for: All ages (adults) Men and women Long-term use Most health conditions Copper toxicity concerns Is copper in GHK-Cu dangerous

It is studied for its potential role in regulating cellular ageing processes, with particular interest in telomerase activity, telomere maintenance, and circadian rhythm regulation
As previously noted, for joint symptoms at least, etanercept 50 mg twice weekly was no more effective than once weekly dosing in the PRESTA trial
Supports both new and existing stretch marks with consistent use
Non-classical hallucinogens include ketamine, tetrahydrocannabinol (THC), 3,4-dioxomethylamphetamine (DOM), and so on [102]