Do copper peptides affect vitamin C?

Copper ions catalyse the oxidation of ascorbic acid.

Evidence

Source:: Buettner GR. Free Radic Res Commun. 1986;1(6):349-53
Applies to:: Formulations containing ascorbic acid
What this does not establish:: How a given product performs on your skin. Finished-product pH and concentration are rarely published, so this describes the chemistry, not a measurement of any specific product.
Last reviewed:: 2026-09-26

In practice

Copper ions catalyse the oxidation of ascorbic acid. Where a copper compound and free vitamin C appear in the same formula without a chelator to bind the metal, both can lose activity faster than either would alone.

Dermasift analyses skincare formulations against published cosmetic science. This is information, not medical advice — for a diagnosed skin condition, speak to a dermatologist.

Check this against a product’s ingredient list

Do copper peptides affect vitamin C?

Copper ions catalyse the oxidation of ascorbic acid.

Evidence

Source:: Buettner GR. Free Radic Res Commun. 1986;1(6):349-53
Applies to:: Formulations containing ascorbic acid
What this does not establish:: How a given product performs on your skin. Finished-product pH and concentration are rarely published, so this describes the chemistry, not a measurement of any specific product.
Last reviewed:: 2026-09-26

In practice

Dermasift analyses skincare formulations against published cosmetic science. This is information, not medical advice — for a diagnosed skin condition, speak to a dermatologist.

Check this against a product’s ingredient list