But we get it—knowing how common hair loss is doesn’t necessarily change the fact that it takes an emotional toll. While there’s a lot of talk on the Internet about which vitamin deficiency causes hair loss, the answer isn’t exactly cut-and-dry. The Best Hair Loss TreatmentsAs mentioned above, it’s important to seek the professional help of a board-certified dermatologist if you’re battling hair loss. It’s good for overall hair follicle health, which is important for any type of hair loss,” she says. In fact, one study showed that men with male pattern hair loss experienced an improvement in hair growth after using an anti-dandruff shampoo.