Hmmm... I thought Spiro reduced the amount of testosterone (which converts to follicle harasser DHT) right???
It does, but finasteride is far more effective, at least in my case. BTW, I'm almost 50(look ~30) and still have hair that gets compliments all day long.
EDIT: Oh and one more thing!!!
To anyone silly enough to still smoke, DON'T!!!
Not only does it limit O2 to your scalp therefore promoting baldness, but also it does cause premature gray.