Citrus Fruits. Citrus fruits, particularly lemons, which contain vitamins A, B and C as well as calcium, phosphorus, potassium and fiber, are blood-cleansing foods.
Another great way to reduce oil production in the scalp is by breaking up the grease before it gets into your body. To do this, every morning drink 1 pint of warm water with the juice of 1 lemon squeezed in. Add to this 1 pinch of himalayan salt, and half a teaspoon of cayenne pepper.
1 Put a cup of your chosen oil in a pot and warm it on a stove top for 2-4 minutes.  Let it cool to room temperature or a temperature that will be tolerable, rather than painful, on your scalp. Feel free to add 2 tablespoons of honey to the oil, as the warm honey will help to smooth the fibers in your hair.