Why Am I Allergic To Some Hair Serums?

Some people have sensitive scalps and skin and are more prone to sensitivies and allergies than others. It wouldn't be possible for Walgreens to know which ingredients in which products are the ones that cause reactions for you. This is an issue best suited for your family doctor or a dermotologist, possibly an allergist, to help you puzzle out. You could also find the full list of ingredients of each and compare them to the ones that don't cause a reaction to try to weed out the exact one or ones that are causing the problem. There is also the unfortunate possibility that two or more ingredients alone aren't causing it, but when used together, irritate your skin in a way that they don't in the other shampoos because the others don't contain the combination that is causing you problems.