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Reference: Liu M et al

How does GHK-Cu affect the hair follicle

Not having enough B12 can cause tiredness, tingling, memory issues, or mood shifts

Cysteine-rich protein 61 (CCN1) domain-specific stimulation of matrix metalloproteinase-1 expression through V3 integrin in human skin fibroblasts

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 youre using an AHA-containing chemical peel, you may use copper peptides after your treatment) Copper peptides in beauty products generally dont pose major risks

There are some very rare side effects listed in medical literature (mostly when large doses are given): for example, one out of many thousands of patients might develop a disturbance in liver enzymes or a tingling in the fingers or toes