Yes, saw palmetto has been shown to have minimal success in stopping hair loss and regrowing bald spots. The treatment, however, is usually more effective and impactful when combined with other active ingredients such as dihydrotestosterone blocking compounds and foods that can spur hair growth such as brazil nuts, fatty fish and eggs. That being said, it is worth noting that saw palmetto is a 5-alpha reductase inhibitor. In other words, it can stop (with minimal success) the seroconversion of free testosterone to dihydrotestosterone at the hair follicles. In some people, this can often mean a chance of regaining some of the shrunk hair strands or at least, some degree of reduced rate of hair loss. But since saw palmetto can inadvertently affect your PSA, it is advisable to always consult with your physician before starting to use this supplement specifically to combat hair loss.