Should I do a patch test before each use – even when I have already used that same product successfully in the past?

Yes, you should. The skin is very sensitive and can frequently change its composition with changes in your hormone levels. Since your skin is constantly in a state of change, we advise that it is necessary (not just desirable) to do a patch test each time to avoid any adverse reactions to the ingredients in our products. This is despite our rigorous dermatological testing process – as everyone’s skin is different, at different points.