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General self-injection preparation, site rotation, and disposal guidance
How to prevent it: Start at 2 to 3 times per week for the first 2 weeks
The combination of copper peptides and retinol can cause irritation in sensitive individuals, though many people tolerate both when used at separate times
Ongoing Phase 2 study of topical GHK-Cu gel for acute skin-wound healing
Theoretical concerns Copper accumulation: Each 2mg injection contributes about 0.03mg copper versus 0.9-2.2mg from daily diet
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