Cosmetics Formulation Development

I didn't mean to start a new thread. But already asked a separate question. The staff never replied. so confused Please answer the 4th question for me, because I have been waiting for a long time. I want the question to be clear. but never received a complete answer. Before selling each formula, we had to wait for the staff to answer questions for almost a month. Vit E only 0.1%, then from the formula should put ROE or not? To put it because I understand that it helps to preserve the ingredients in the formula. From the formula Perfect-C 5% DPHP 2 % Vit E 1% contains 1% ceramind complex 4) This formula has to block the ingredients. which is leading to deterioration or rancid smell by putting Vit E with ROE, if you should put both of them or not, and about how many percent?

Hello,

Question number 4, some of the officers answered that it was to reduce. Vit E only 0.1%, should ROE be put in the formula or not? To put it because I understand that it helps to preserve the ingredients in the formula

can be used with it.