If you have a very oily scalp

This could be a sign that there is a problem with estrogen secretion. If there is no issue with estrogen secretion, you should check if you are regularly consuming foods high in estrogen, as this could be a problem with oral contraceptives! If it is not an estrogen issue, it might be due to the shampoo you are using; in this case, continue using your existing shampoo, but using a shampoo containing salicylic acid alongside it is said to be effective in reducing scalp oiliness!