Cosmetics Formulation Development

I've seen this substance in some brands of cream as n-butyl resorcinol ,4-n-butyl resorcinol same as Name 4-butyl Resorcinol Activate resorcinol of myskinrecipes?

Hello, they are all the same substance. n-butyl resorcinol 4-n-butyl resorcinol 4-butyl Resorcinol Activate resorcinol

Please allow me to ask more questions. such substances Does the FDA have a prescription that does not use more than how many % of these substances have been found to be used at 0.5-5% because it is information from some manufacturers? The use of the % quantity depends on the manufacturer's recommendation, right? Thank you.

Hello, reasonable usage rate. And under the terms of the FDA shown on the web page details of such ingredients. You can click on the ingredient name. For details, usage rate, how to use it.