The Flourish Shampoo, Conditioner, and Thickening Styling Treatment should be safe to use while pregnant or breastfeeding, but we always suggest reviewing the ingredient lists with your doctor. We also recommend those pregnant or breastfeeding consult with a doctor before using the Density Booster®, as it contains a vasodilator. We do not recommend using Minoxidil during pregnancy or while breastfeeding.