I gave myself one rule: nothing over $25, and it turned into the most-used shelf in my beauty stash. L'Oréal's best stuff — the serums that fixed my dull skin, the foundation that finally matched me, the shampoo that saved my hair — never needed a high price tag to work. If you've ever wondered whether the drugstore version of a $60 "hero product" actually holds up, this list is your answer.