Part 2:  Hair loss supplements – what helps, what harms? This is part two of the two-part series where we explore the evidence behind supplements used for different types of hair loss.  We are reviewing saw palemtto, pumpkin seed oil, Nutrafol, Viviscal and even exosomes for hair loss. We look at what might support hair growth, what’s ineffective, and what could even be harmful or potentially linked to cancer.