Choosing how often you want to incorporate scalp serum into your routine is really a matter of personal choice. Some students use them daily, while others opt for weekly treatments. It all depends on how your hair and scalp react to the product or formulation you are using as well. Some scalps get easily overwhelmed if too much product is applied too frequently, whereas others really benefit from frequent treatments. Ultimately it is best to just listen to your scalp as it will tell you if it is happy or not. Do keep in mind that the more often you use one, the more frequently you may need to wash your hair. And remember to perform a patch test before using any new product on your scalp.