Coal tar is not especially a fungus fighter. The active ingredient in Nizoral is a fungus fighter; maybe that's what you are thinking of. Coal tar has been used for years to combat skin irritations, including psoriasis and eczema. It is safe to use every day if you wish, although you will probably want to use a conditioner at least some of the time. Thus T-Gel is effective in fighting general skin inflammations, such as you might get by using topicals such as Revivogen and sometimes minoxidil. T-Gel has a 1% coal tar concentration. I find it to be very effective in combatting scalp irritation.