Cosmetics Formulation Development

mix วิตามินซี skincecuticals formula Not clear TEA (alkali)? If you can, which substance can you put instead? Vitamin C added, used to use kiehl's, ph2, skin is acceptable, thank you.

Vitamin CE Ferulic understand that this product is registered with the FDA, which has a requirement that the pH must not be lower than 3.5, so it must be Triethanolamine to adjust the pH not to be below the threshold (wait for the staff again in case I misunderstand) if you want to mix it yourself, if not put Triethanolamine I think there shouldn't be any problem. Wait for confirmation from the staff again ^^