I do not know of any specific product that has been promoted to help hair growth or prevent losing hair.
That said, there are people, that due to stress, seem to lose their hair more rapidly then usual. While there is huge genetic component to hair lose, reducing stress in your life can possibly slow down hair loss.
Using a cannabis product that does reduce stress may be helpfull. A 8:1 ratio CBD:THC with a low THC content may help reduce your stress. As will all cannabis products, start low and slowly increase to the level that you are comfortable with.
Perry Solomon, MD