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GHK-Cu is used strictly as a tool compound in laboratory research, as described in the overview above

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Get inspired Ideal for daily skincare routines, this serum combines powerful whitening agents with anti-aging ingredients

That means you dont have to worry about whether the antioxidant is being absorbed, because youre doing the hard work for it to begin with

Option 1: Discard and mix fresh Cost: Price of new vial Benefit: Guaranteed full potency Risk: None (besides cost) Option 2: Continue using Cost: None (already paid for) Benefit: Don't waste remaining peptide Risk: 10-15% potency loss means 10-15% less effectiveness Calculation: If vial costs $50 and you're at day 35 with half remaining, you're deciding whether to waste $25 to guarantee full potency, or accept 10-15% reduced effectiveness