I heard that hair falling is an autoimmune disease, with the body attacking its own hairs. Then, there is Wim Hof (google him), that has scientifically shown to control consciously so many processes in his body that were previously thought to be impossible.
Some forms of alopecia have an autoimmune cause. This is more common in women then men. 99% of men who are losing their hair find genetic causes inherited through various family lines.