In fact, we are no strangers to the preservatives, but the understanding of the preservatives is not much, most people are confined to the name of the understanding of preservatives. What is the preservative in the end? In fact, most of us are not clear. But the preservatives have entered the various areas of our lives, not only in the skin care products inside, there will be preservatives in the food figure. Many people treat preservatives as toxic additives, which is wrong. It can be said that if there is no preservative, the processing of things stored, but two or three days will be oxidized, rotten, skin care products is the same.
Is the preservative toxic? This is a lot of people want to understand the problem, but also confused our many years of the problem. In fact, to be clear that there are many kinds of preservatives, there are good and bad points. Good quality preservatives, in fact, the body is not hurt, and vice versa on the body can not be estimated damage. Common skin care preservatives are benzoic acids, nipagin esters and sorbic acid preservatives. The following we have to talk about how their toxicity?
First, benzoic acid, common with benzoic acid, sodium benzoate, potassium benzoate and so on. Benzoic acid and its salts are one of the common preservatives, the best anti-corrosion PH 2.5-4.0, PH5.0 in the above products, the sterilization effect is not very satisfactory. Because its safety is only equivalent to potassium sorbate 1/40, Japan has completely banned its application in food. But this kind of preservative price is relatively low, so the general cheap cosmetics are used this preservative, reduce costs, pay attention to this problem, if the skin care products is this type of preservative, then it is best not to use.
Second, the paraben esters, common with methyl p-hydroxybenzoate, ethyl, propyl, butyl, butyl p-hydroxybenzoate anti-corrosion effect is better. Nipagin ester in PH4-8 when the range has a good effect, does not change with the PH value, stable performance and toxicity is lower than benzoic acid, corrosion resistance than benzoic acid, is a broad-spectrum preservatives , And more than two of the esters are used in combination. Use this type of preservative skin care products, the quality is relative or wrong, it will not cause harm to the skin.
Third, sorbic acid, common with sorbic acid and potassium sorbate and so on. Sorbic acid and its salts can effectively inhibit the activity of mold, yeast and aerobic bacteria, but also to prevent the growth and reproduction of harmful microorganisms such as Botox, Staphylococcus, Salmonella and other harmful microorganisms. However, it is almost ineffective for anaerobic Bacillus and Lactobacillus acidophilus and other beneficial microorganisms, and its inhibitory effect is stronger than sterilization, and the antiseptic effect is 5-10 times that of sodium benzoate of similar products. 2.5 times. Commonly used in food preservatives, is recognized as the world's most promising and most secure food preservatives, generally used for organic cosmetics.
In short, the main role in the use of preservatives in the skin care products to prevent the growth of microorganisms in the product to maintain the stability of the nature of skin care products, and open the lid after use is not easy to degenerate. Preservatives are essential for cosmetics, but we can use cosmetics from what kind of preservatives, the initial judgment of the value and price of such cosmetics for skin safety to choose.