Cosmetics Formulation Development

Didn't know Activated Resorcinol is used in conjunction with Tranexamic Acid or not? and can see the results that reduce melasma How many days have you used it? (If the ingredients are about 1%) or is there a recommended recipe?

Hello - Can you use them together? - I can't answer how long it takes. It depends on the user's skin. and other components in the formula