Regaine extra strength scalp foam is used to treat thinning hair and hereditary hair loss in men between the ages of 18 to 49 years and comes in a can so it is quick and easy to apply. Regaine foam is only suitable for men and not to be used by women. Regaine foam works best on men with hair loss or thinning hair at the top of the scalp. You will be unlikely to see any benefit from using Regaine extra strength foam if you are totally bald or have been bald for many years. Regaine Foam contains the active ingredient Minoxidil 5% Regaine foam for men works by preventing further hair loss and helping hair to re grow. It contains Minoxidil which is thought to work by helping the blood flow to the hair follicles on your scalp. Regaine foam can be applied to dry hair after swimming and can be used on dyed hair as long as the person who is applying the colouring massages it gently into your scalp to prevent breakage to the newly grown hair. Once you start to use Regaine foam your hair re growth will be very soft and fluffy at the beginning and may be hard to see.