Can this serum be mixed? Do you need to adjust anything? I need a pH of about 4-5. I need it to fight free radicals, reduce irritation, make my skin clear. Serum texture for all skin types 1. Vitamin C (L-ascorbic acid) (Ultra-Fine) 15% 2. Vitamin E (dl-alpha tocopherol) 1% 3. Ferulic Acid 1% 4. P...
