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OTC serums often label 1% peptide blend, but actual GHK-Cu is a fraction of that
Why it matters: Temperature swings accelerate degradation Door is warmest part of fridge Frequent opening and closing Best practice: Store in main fridge section Middle or back of shelf (stable temperature) Away from freezer section Mistake 5: Not protecting from light Light exposure degrades copper peptides
Duncan RE et al
According to the FDA-approved prescribing information for tirzepatide, injection site reactions are among the reported adverse events
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