Do natural skincare products contain preservatives? Why? 天然護膚品有防腐劑嗎？ 為什麼？

As most skincare products contain water in them, preservatives are substances found in these products including natural skincare products as these substances help to prevent bacterial growth, contamination and to extend the shelf life of these products.

The preservatives used in skincare products can be natural or synthetic. Which preservative to be chosen depends on the mix of ingredients and how it interacts with the formulation of each product. By comparison, synthetic preservatives have more options over natural preservatives and they work in smaller quantity. Natural preservatives are less cost effective as larger quantity in its formulation is required for them to become effective.

For skincare products without preservatives, they may last for about 5 days if put into a fridge. Hence, the usage of natural preservatives such as Dehyroacetic Acid, Glycerin, Benzyl Alcohol etc. are some of the common ingredients used in maintaining the lives of natural skincare products.

由於大多數護膚品包括天然護膚品中都含有水，為了防止細菌生長和污染，並延長產品的保質期，這些產品都加上防腐劑。

用於護膚品的防腐劑可以是天然或合成的。選擇那種防腐劑取決於成分的混合以及它與每種產品配方的相互作用。相比之下，合成防腐劑比天然防腐劑有更多的選擇，它們的用量較少。天然附腐劑的成本效益較低，因為其配方中需要較大量才能使其有效。

對於不含防腐劑的護膚品，如果放入冰箱，其保質期可持續約5天。

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