Cosmetics Formulation Development

1. I want to ask Vitamin CE Ferulic ready to use formula can be mixed Ectoine 2% and Fullerene 0.5% can you add? Antioxidant Anything else can be added?

Hello, you can add Ectoin and Fullerene other ingredients that can be added check that Can it be mixed in a formula with a pH range of 3.5? Because Vitamin CE Ferulic has a pH around that range.