The 19 Best Deodorants for Women, According to Experts

The difference has to do with a key ingredient and its function: "Importantly, the only ingredients currently approved by the FDA to be included as an antiperspirant are aluminum-based, so this is especially important to look for when looking for an antiperspirant," says Garshick. "Antiperspirants work by decreasing the amount of sweat released by plugging up the sweat glands to directly block the release of sweat from the glands, thereby reducing wetness."

Deodorant is helpful because it helps cover up the smell from sweat and activity. However, "It’s important to understand that your sweat itself doesn’t have a bad odor—it’s the bacteria on your skin mixed with the sweat that creates the stinky smell," explains Mraz. "The underarm in particular is an ideal environment for bacteria because its warm and dark, this is why underarms are the place we think of fist when we think of B.O."

Although some deodorants may have ingredients that help absorb sweat, their main function is fighting odor. Garshick also notes that the products differ in when they are—or should be—applied. "Often deodorants are applied during the daytime to provide odor protection throughout the day, but deodorants in combination with antiperspirants are best used in the at bedtime," says the derm.

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