With nearly half of all pregnancies worldwide being unintended, the need for effective, reversible male contraceptives remains urgent. Despite decades of research, men still have very few birth ...

It blocks a protein that binds to a form of vitamin A (retinoic acid) in our cells, known as retinoic acid receptor alpha (RAR-α).

The best retinol for mature skin is one that pairs the ingredient with other anti-aging actives, like peptides, and isn’t too drying. Shop our top picks.