Cosmetics Formulation Development

I would like to ask about the use of the substance, how many % do I have to put in order to be effective? 1% and 5% are the same efficiency?

Hello, due to the appropriate level of use Depending on a variety of variables, for example: 1. The texture of the formula, for example, there are other elements that act. in combination, or the formula is used only. alone 2. User skin characteristics such as dry skin, need concentration of more than oily skin 3. Kind of ( , , ) 4. The purpose of the formula because has a wide variety of functions. Just expecting hydration. The usage rate of 0.5-1.0% is usually sufficient. But if expecting reduce redness, the use rate of 3% is enough, so the team can't answer clearly how many % use rate is the most suitable. Members must test the formula and compare it with the user group. and consider according to the information above recommended