现在用得较多的是surfactant 是 SLES，多了一个ether group. But in fact, there is approximately 30% SLS in 3-mole ether sulfate due to the traditional ethoxylation process.SLES got an improvement but it still does not provide an SLS-free product.

all chemicals used in personal care product are rate at least 1 for health, which means they do provide negative effect to our health.

以前也很会败护肤品，半年实习在personal care lab里面做formulation and test，理智多了。还是天然的东西好。