Antioxidant serums

Hi I’m currently using 15% ascorbic acid in the morning under my sunscreen for it’s antioxidant properties and I’ve been noticing my skin is glowing! However I’ve noticed it oxidizes fast and when it does it causes irritation.

I’ve been hearing that copper peptides have an even more powerful antioxidant effect and aren’t as unstable. Is this true ? If so which products do you recommend ? Thank you