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Protective effects of pyrroloquinoline quinone in CNS disorders - ScienceDirect

You should avoid using copper peptides at the same time as the following ingredients: retinol vitamin C alpha hydroxy acids (AHAs), such as glycolic acid (if you’re using an AHA-containing chemical peel, you may use copper peptides after your treatment) Copper peptides in beauty products generally don’t pose major risks

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However, normal GGT values vary between laboratories and testing methods, so always compare your results to the specific reference range provided