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Nature 581, 7176
Commercial serums offer 12-24 months unopened shelf life with professional preservative systems and 6-12 months post-opening depending on packaging (airless pump best), while DIY serums last only 1-2 weeks refrigerated without professional preservatives
We generally suggest wearing one patch per week
Review the documented purity and identity/composition data for this batch
When starting with copper peptides, always perform a patch test
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