“Nanoxidil is very similar to minoxidil, without the side effects of an irritated scalp that some Rogaine users report,” explains Green, making nanoxidil a good bet for patients who have experienced scalp sensitivity or dry skin from Rogaine. She suggests this nanoxidil product from DS Laboratories, which is also formulated with retinol to promote scalp health and azelaic acid to block DHT. While nanoxidil in general is a fairly new product, Green tells us it has proven very effective in treating hair loss because nanoxidil “has a smaller molecular weight, which allows it to penetrate the scalp faster, resulting in a better absorption rate,” she says. Like finasteride, Green says it has also been shown to increase hair density as well as hair growth.