Avoid together
Can you use Copper Peptides and Vitamin C together?
Vitamin C + Copper Peptides may cause oxidation
The short answer
Avoid together
Copper can accelerate the oxidation of Vitamin C, making it less effective. The combination may also produce free radicals.
A documented conflict that should not be combined in the same application.
What can change the answer
Formula and strength
Concentration, pH, delivery system, and whether both ingredients are in one tested formula can matter.
Frequency and the rest of your routine
Layering several strong actives or using them too often can raise irritation risk.
Your skin and prescriptions
Sensitivity, barrier damage, skin conditions, and prescribed treatments can change what is appropriate.
Sources behind this rule
- StudyPickart L. The human tri-peptide GHK and tissue remodeling. J Biomater Sci Polym Ed. 2008;19(8):969-88
This page is educational and is not medical advice. If you use prescription skincare or have a skin condition, ask a qualified clinician before changing your routine.