The term "2 in 1" in haircare has somewhat of an indirect definition — and it comes down to branding. In general, 2-in-1 shampoo and conditioner is typically a shampoo with extra hydrating properties. "If you see a shampoo with the word 'hydrating' or 'moisturizing,' it probably contains the same ingredients that make a shampoo 2-in-1," Paul Wintner, hairstylist and global education manager for Alterna Haircare, told Real Simple.
Therefore, 2-in-1 shampoos and conditioners are mostly shampoos with some of the benefits of a conditioner, as opposed to a singular product with the complete functions of both. As such, you shouldn't rely on them as complete replacements for either product. Dermatologist Daniel Belkin told Allure that conditioner's moisturizing properties are not nearly as effective when paired with the cleansing properties of shampoo. "A 2-in-1 that promises both a deep clean and to make hair feel moisturized, shiny, and smooth is overpromising," he said.
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