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If you are already using retinoids, AHAs, or other actives that increase cell turnover, adding GHK-Cu on top without adjusting your routine is asking for trouble

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Many people report improved mental clarity and focus after starting B12 supplementation

Photoaged Skin Trial Leyden et al., Cosmetic Dermatology / cited in Pickart 2015 Leyden and colleagues conducted a 12-week, vehicle-controlled trial of topical GHK-Cu cream in 71 women with photoaged facial skin

Choi SH, Bylykbashi E, Chatila ZK, Lee SW, Pulli B, Clemenson GD, et al

Once opened, refrigeration helps maintain stability