As part of the latest TikTok beauty trend, .users have been adding crushed birth control pills to their shampoo to make their hair fuller.TikTok user @uwubrat has been credited with starting the trend back in July after hearing the advice from her mom.The whole theory is based on the fact that estrogen, which is present in hormonal contraceptives, can promote hair growth.Dr. Shirin Lakhani, an aesthetic physician who works for Elite Aesthetics, .was one of the doctors who told Daily Mail why this seemingly clever hack just won’t work.“Hormonal contraceptives are not designed to be absorbed transdermally and the skin is an otherwise impermeable barrier”.She recommended simply adding more foods rich in biotin and vitamin B to your diet if you’d like to see more hair growth