As for adverse events, a similar percentage of participants across the treatment groups experienced the most common side effect of gastrointestinal upset [2]
Although such studies focus on creams, injectable GHK-Cu delivers peptide directly to deeper layers, potentially amplifying these effects

Resources: Glutathione: Benefits and Supplements (webmd.com) Glutathione an overview | ScienceDirect Topics Glutathione synthetase deficiency | About the Disease | GARD (nih.gov) The Role of Glutathione Metabolism in Chronic Illness Development and Its Potential Use as a Novel Therapeutic Target PMC (nih.gov) Evidence of oxidative damage and inflammation associated with low glutathione redox status in the autism brain | Translational Psychiatry (nature.com) Glutathione dysregulation and the etiology and progression of human diseases PMC (nih.gov) A Review of Dietary (Phyto)Nutrients for Glutathione Support PMC (nih.gov) Oral supplementation with liposomal glutathione elevates body stores of glutathione and markers of immune function PMC (nih.gov) liposomal-glutathione-techsheet.pdf (itcpharmacy.com) * These statements have not been evaluated by the Food and Drug Administration

Injectable healing protocol: Dose: 2-3mg daily (higher end of range) Frequency: Daily throughout healing period Duration: Until wound resolves plus 1-2 weeks Injection site: Systemic (not into wound) Topical healing protocol: Concentration: 2-4% in wound-appropriate vehicle Application: 2-3 times daily to wound margins (not directly into open wounds) Duration: Throughout healing process Note: Consult healthcare provider for significant wounds GHK-CU pairs exceptionally well with BPC-157 and TB-500 for wound healing
Exposure to Radiation: Radiation from medical imaging (like X-rays and CT scans) or environmental sources (such as UV rays from the sun) generates free radicals
Reported concerns include local injection reactions, potential immunogenicity from copper exposure with chronic use, and theoretical risks if peptides activate unintended growth pathways