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doi: 10.1177/0963689717725755

Skin Care Benefits of Copper Peptide Containing Facial Cream (12-week trial in 71 women with photoaged skin)

NNMT is associated with the process of cellular aging and fat storage

They may work reasonably well for GI issues or systemic support, but bioavailability is less predictable

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After receiving an injection, some people experience symptoms at the injection site on the skin