Ingredients in skin care products that are prohibited for pregnant women During pregnancy, pregnant women need to pay special attention to the use of their own skin care products. Because some ingredients may affect the fetus. The following are skin care ingredients that are prohibited for pregnant women. 1. Phenolic compounds such as hydroxybenzoate (methyl 4-parahydroxybenzoate), hydroxybenzoic acid, benzoic acid, phenoxyethanol and phenol, which have certain effects on the fetus. Especially in the early stages of pregnancy, these substances can pass through the cell membrane and enter the embryo during pregnancy.