“Oily hair types should avoid shampoos that contain heavy oils or silicones, as these will weigh your hair down and add more oil to your hair,” says Ashley. “Thick oils, rich conditioners, or heavy styling creams applied near the scalp can weigh hair down and trigger your scalp to produce even more oil. We tested shampoos for oily hair on a variety of hair types, including fine hair, textured hair, and curly hair, to see if they met our criteria.