P. ovale is very common and virtually all of us have it on our scalps. Normally it is kept under control, but sometimes it proliferates out of control. This excessive activity can be the result of hormones, stress, diet, climate, or even how genetically susceptible or resistant we are to this fungus. P. ovale fungus has been implicated in dandruff. When fighting off excessive growth of P. ovale our skin cells proliferate too fast.
Dead skin builds up on the scalp.
Eventually the dead skin cell layers break up and flake off as dandruff. Controlling P. ovale helps significantly in blocking dandruff. Kev's comments Unofficially, Nizoral has been promoted as a hair growth activator. Some claim it is as effective as minoxidil in promoting hair growth. As well as working against microbes, Nizoral also reduces the production rate of sebum.