Banned Ingredients in Cosmetics for Pregnant Women Cosmetics are an indispensable part of women\’s products, so pregnant women will also use cosmetics to enhance their appearance. However, some ingredients in cosmetics can have adverse effects on the fetus, and pregnant women need to pay attention before purchasing them. This article will elaborate on the prohibited ingredients in cosmetics for pregnant women from 4 aspects. 1. Preservatives Preservatives are common ingredients in cosmetics. They can extend the service life of cosmetics and prevent bacteria.