Now, before you get too excited, know this: Nothing will make those hairs grow overnight Dermatologist Matthew Lin , MD, tells us that the most effective boosters — like minoxidil or bimataprost (which is the main ingredient in Latisse) — require a prescription. He also notes that there could be an underlying reason why your brows aren't growing, like an autoimmune disease or alopecia, which require a physician's supervision. But if that's not the case, you don't necessarily need a doctor's note to give your brows some extra TLC.