the bottle says in big letters DO NOT USE MORE FREQUENTLY THAN STATED, which is 4x per week for 2 weeks and then just once a week thereafter. using it 3x a week is because we, as male pattern baldness sufferers, are more prone to irritated scalps. but using it every day or every other day? not only will this fry your hair, maybe even permanently damage the hair shafts, but might be harmful to the follicle - after all, they put the warning on the bottle for a reason. may be to cover their backs, but the reason still exists - this is strong stuff.