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Injection-site issues: redness, swelling, or irritation are common to any SubQ injection and are made worse by poor technique or low-quality product

Some protocols use ascorbic acid (vitamin C) or alpha-tocopherol as sacrificial antioxidants to delay GSH oxidation, though these must be accounted for in experimental design since they introduce additional redox-active compounds

Exploring the beneficial effects of GHK-Cu on an experimental model of colitis and the underlying mechanisms

ProHealth's FAQ notes that many users prefer taking it in the morning for routine consistency, and that some studies suggest absorption may be enhanced when taken with food - though the brand describes the arginate salt as stable in the stomach environment regardless