Shampoo good for oily scalp

My husband has an oily scalp, so his scalp was really itchy, and whenever he wore black clothes, white flakes would fall onto his shoulders like snow, which was really unsightly. However, two months ago, after hearing about it from others, he started using Head & Shoulders products for oily scalps, and the itching and dandruff have definitely decreased significantly. It is truly one of the best products we have ever used.