by Angelique Serrano, July 26, 2021

“Hair dye contains chemicals, such as hydrogen peroxide and ammonium hydroxide,” says Kecia Gaither, M.D. double board-certified physician in OB-GYN and Maternal Fetal Medicine. “Research is mixed as to hair dyeing in pregnancy, [but it’s] generally accepted to be safe.” Small amounts of dye are absorbed into the skin, says Gaither, who recommends use in the second trimester of pregnancy. Cosmetic chemist Ginger King tells Romper that the ingredients in hair dye or bleach “adhere to hair the most.”

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