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Aged C57BL/6J mice (18-24 months) : more naturalistic model, slow but robust, ideal for long-term studies on Semax or Selank

Even though it is yet not clear whether or not the GHK-Cu peptide can pass the blood-brain barrier, there is a high possibility that it will do so, since GHK-Cu has a very high uptake into human skin, easily passing through the lipids of the epidermal barrier [66, 67]

Quantitative assessment of primary skin irritants in vitro in a cytotoxicity model: comparison with in vivo human irritation tests

Vitamin C serums, used separately from any copper products, support collagen synthesis by serving as a cofactor for prolyl hydroxylase and lysyl hydroxylase enzymes

Do you have to inject GHK-Cu peptide