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Copper peptides and niacinamide can be used together, and most users prefer: Serum first (copper peptides) Moisturizer or niacinamide product second Because Glimmer Goddess formulas include aloe, hyaluronic acid, and other hydrating ingredients, the Copper Peptide Serum layers smoothly before moisturizers without pilling

It works well but has a practical limitation

RESEARCH ONLY

And your cells' normal biochemical reactions trigger oxidative stress and the release of free radicals that can impact cellular health and function

People with active cancer should consult their healthcare provider before using GHK-Cu because the peptide promotes angiogenesis, which could theoretically supply blood to tumors