I had recurring problems with scalp fungus. It wasn't too bad in summer, when I was out in the sun and swimming in salt water, but come late fall and winter I would get large pieces of scalp flaking off and my hair would be greasy. My hair was thinning out and my scalp was itchy.
I tried GSE (grapefruit seed extract) by putting a few drops in my shampoo. I mixed them together in the palm of my hand each time I shampooed, which was every other day.I left the lather in for two minutes or so. The results were immediate, now I just have a slight touch of dandruff, no itch and my hair seems to be getting a little thicker. My hair and scalp definitely look better as well.