Cosmetics Formulation Development

Please advise staff to use Z white (Zinc Glycinate) as well. Sym White , Activated Resorcinol , perfect c , Ume Extract , Ethyl Ascorbic acid , Alpha Arbutin , B3 can be used together? Will it reduce the properties? 2. Can be dissolved in water by adding in any step, right? 3. Should have Disodium EDTA in how much to prevent deterioration as Sym White or any other type? 4. The recommendation rate is 1.5%, but if you use it at 1%, it starts to collapse on your face, but if you use 1.5%, it will collapse more than 1%, or you feel like it's collapsed, no different. if not different So I think I put 1.5% for efficiency in recommending. thank you

Hello, 1. Z-White can be used with every ingredient but Perfect-C and Vitamin B3 Can't be used together 2. Yes 3. No need but Disodium EDTA should be added to the formula as usual. 4. Depends on the user's skin.