It is usually advised not to use high-dose vitamin C products and retinol together.

Actually, products like Primera Vitatinol are made by mixing two types together.

I've heard a lot of people say it's better than expected, so I'm planning to try it out this time too lol

I'm currently using vitamin C products and retinol products separately, but I don't use them every day because I'm worried they might burden my skin. However, I'm curious if there would really be a synergy if I used them together.