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Unless you're a dermatologist or work in the deodorant industry, chances are you've been applying deodorant in the morning as part of your daily routine—showering, brushing your teeth, and getting dressed. However, as someone who has followed this routine for years, I was shocked to discover that we've all been doing it wrong. Research shows that the optimal time to apply deodorant is actually at night, just before you go to sleep.
Understanding the Distinction: Deodorant vs. Antiperspirant
It's important to note that the nighttime application rule applies specifically to deodorants that contain antiperspirant. Regular deodorants, which lack antiperspirant, are designed to neutralize or mask odor-causing bacteria but do not reduce sweating (as anyone who has used brands like Tom’s of Maine can attest). Antiperspirants, however, work by temporarily blocking sweat pores, reducing perspiration, and keeping your underarms dry, which in turn prevents the growth of odor-causing bacteria.
Why is applying deodorant at night more effective?
Applying antiperspirant deodorant at night is more effective because your body is less active during sleep, leading to reduced sweating and lower body temperature. This dry environment allows the active ingredient in antiperspirants—aluminum—to be absorbed more efficiently, as Dr. David Pariser, president of the American Academy of Dermatology, explained to Consumer Reports. Without sweat interfering, the aluminum can penetrate the skin more effectively. Overnight absorption ensures the antiperspirant works better than if applied during a busy morning routine.
Great news: Morning showers won’t remove it
If showering in the morning is a must for you, don’t worry—this rule still applies. Since the antiperspirant has had ample time overnight to penetrate and block sweat pores, it won’t sit on the skin’s surface and get washed away. Additionally, most antiperspirants are designed to last 24-48 hours, meaning you might not need to reapply daily, depending on your sweat levels.
Is the aluminum in your deodorant a cause for concern?
Despite widespread online speculation linking aluminum to breast cancer and Alzheimer’s disease, the demand for aluminum-free “natural” deodorants continues to rise. However, the Alzheimer’s Society states that numerous studies, both small and large, have found no conclusive evidence connecting aluminum exposure to Alzheimer’s in humans. We’ve also thoroughly examined and debunked the alleged links between aluminum and these health concerns. (Though, let’s be honest, some of you are already typing your rebuttals in the comments.)
Here are a few more surprising deodorant facts...
To further challenge your daily routine: Since deodorant works best on dry skin, applying it right after a shower is a no-go. Make sure your underarms are completely dry before application. Additionally, deodorant isn’t just for your armpits—it can be used anywhere you sweat. While we haven’t personally tested it on every sweaty area during summer, we’re not ruling it out. For men, it can even be applied to the groin area (though this isn’t recommended for women). You’re welcome—or maybe not. We’re still deciding.
