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Now, B12 helps regulate the nervous systems response

PMC: PMC6015571

In a separate head-to-head comparison, GHK-Cu outperformed both retinol (vitamin A) and vitamin C in improving skin firmness and elasticity, and it did so without the irritation, photosensitivity, or adjustment period associated with retinoid use

Topical and Nasal AOD-9604 Topical and nasal forms appear in marketing, but the FDA review found no published human exposure data for transdermal or intranasal AOD-9604

This is the same process used for many hormone treatments

Potential cardiovascular and renal concerns have emerged from observational research