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So the protocol sets the dose to land GHK-Cu in a sensible daily range (~1.67 mg), and the three recovery/anti-inflammatory peptides ride along at their lower 0.33 mg each

Supports skin health and immune function

Yes, research has shown that vitamin C works well and can be used with other beneficial ingredients including niacinamide, retinol, peptides (except copper peptides, which Paulas Choice does not use) and exfoliating acids

While most AHA (Alpha-Hydroxy Acids) serums focus only on the exfoliation aspect that can sometimes lead to tightness and irritation, this multitasking serum is formulated to not only gently dissolve dead skin cells but also replenish moisture and nourish the skin with its hydrating blend of Hyaluronic Acid, Niacinamide, and essential fatty acids from Organic Rosehip and Tamanu Oils