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If you want to use both, its best to alternate them on different days to avoid over-exfoliation or sensitivity
They conducted an in-vivo (made on real people) study with 33 participants and found that the test formula, with just 0.5% AAP, "significantly" reduced hyperpigmentation (age spots) after 8 weeks (by 29-33%)
They are not intended for human use and have not been evaluated by the FDA for diagnosing, treating, curing, or preventing any disease
10.1152/ajplung.00086.2013 30 GonzalesJ
GHK-Cu and retinoids like tretinoin are both powerful actives, but using them together at the same time can cause skin irritation or reduce their effectiveness
Their combined antioxidant activity helps support overall wellness and healthy aging
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