Rogaine Foam is the most used product for hair loss. It contains Minoxidil (5% for men) which is a direct vasodilator with recommendations in cardiology. Severall studies showed that minoxidil had a common side effect: hair growing, mainly on the scalp.
Rogaine Foam is very efficient, but please keep in mind that it must be applied every day, all your life. The foam has the advantage of better absorbtion into skin, where the minoxidil actions.
When you start the treatment with Rogaine Foam, please do not forget this: the hair will fall when you stop the administration. You must apply it every day in order to keep your new hair up.