Collagen is the main structural protein of skin, cartilage and connective tissue. Its synthesis falls with age, which is associated with wrinkles and loss of skin elasticity. Hydrolyzed collagen is sold as a supplement on that basis; bioactive peptides such as GHK-Cu are studied in the same area. This article sets the two side by side as they appear in preclinical work.
Hydrolyzed collagen
Hydrolyzed collagen is obtained through a hydrolysis process that breaks down collagen molecules into smaller, more easily absorbable peptides. Studies in preclinical models have demonstrated that these peptides can stimulate collagen synthesis in the skin, improving its hydration and elasticity.
Mechanism of action
- Stimulation of fibroblasts: Hydrolyzed collagen may activate fibroblasts in the dermis, promoting the production of collagen and elastin.
- Improvement of hydration: Collagen peptides help retain moisture in the skin, which may reduce the appearance of wrinkles.
Bioactive peptides
Bioactive peptides, such as GHK-Cu, are fragments of proteins that exert specific biological functions. In preclinical models, GHK-Cu has been shown to have regenerative properties, including promoting wound healing and reducing wrinkles.
Mechanism of action
- Cellular regeneration: GHK-Cu has been observed to increase cell proliferation and fibroblast migration, which matters for tissue repair.
- Antioxidant properties: This peptide also acts as an antioxidant, protecting cells from damage caused by free radicals.
How the two compare
Which of the two is the better fit depends on the research question. Preclinical work on hydrolyzed collagen reports on hydration and elasticity endpoints; work on GHK-Cu reports on cell proliferation, fibroblast migration and oxidative damage. The published endpoints are not the same, so the two literatures are not directly comparable.