Yes, cosmetics contain many nutrients, in order to prevent these nutrients from generating bacteria, triggering the deterioration of maintenance products, add preservatives in cosmetics to inhibit the growth and reproduction of bacteria and fungi, to avoid the deterioration of cosmetics, so as to maintain the freshness and efficacy. There is a wide range of preservatives, mainly divided into chemical preservatives and natural preservatives. In China, there are about 55 kinds of cosmetic preservatives available, but the most commonly used ones are more than 10 kinds. Chemical preservatives due to bactericidal broad-spectrum, efficient, long-lasting, coupled with inexpensive and beautiful. Estimated to account for more than 90% of the cosmetic preservatives market, a single variety of nipagin esters, carson, PHMB, MIT, BNP, IPBC, DMDMH, Diazolidinylurea, quaternary ammonium salts, benzoic acid / sodium benzoate, Sodiumborate, Triclosan, dehydroacetic acid / dehydroacetic acid, sodium, and so on. Natural preservatives have some antimicrobial effect and are generally more expensive to use. For example, many brands currently add organic natural plant extracts as preservative ingredients, such as: tea tree essential oil class, with anti-inflammatory and antibacterial effect, inhibit the growth of bacteria is also often seen on the market natural preservatives.