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Injection-Related Risks With Injectable GHK-Cu FDA identifies compounded injectable drugs containing GHK-Cu as a potential immunogenicity risk because of aggregation and peptide-related impurities, and FDA notes limited human data to inform safety considerations [8]

according to the National Academies of Sciences, Engineering, and Medicine, absorption is approximately 50% at 1 mcg but falls to roughly 1.3% at 1,000 mcg

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Peptides that support gut lining and immune signaling help stabilize nutrient absorption meaning the protein, electrolytes, carbs, and vitamins you keep buying might actually get used instead of wasted