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Copper Peptide Products Versus Retinoids and Cosmetic Actives Cu-GHK has been compared with vitamin C and retinoic acid in a small collagen-production context summarized in a topical peptide review, where collagen increased in 70% of Cu-GHK-treated participants versus 50% with vitamin C and 40% with retinoic acid after one month [2]

Precautions General Precautions: Vitamin B12 deficiency that is allowed to progress for longer than 3 months may produce permanent degenerative lesions of the spinal cord

Precision Localized Application: Allows for targeted external use on specific areas

In an alcohol-instilled rat model, gastric, esophageal, and duodenal lesions develop alongside loss of left gastric artery vessel presentation

For the full breakdown of the research, see our guide on whether B12 injections work for weight loss