BY THE OPTIMIST DAILY EDITORIAL TEAM

If you’ve ever swiped on antiperspirant only to find yourself sweaty and smelly by midday, you’re not alone. The issue might not be what you’re using, but when you’re using it. And according to dermatologists, timing is everything.

The timing mistake most people make

Antiperspirants are different from deodorants. While deodorants simply mask odor, antiperspirants actually reduce sweating. “They do this using aluminum-based ingredients that temporarily plug your sweat glands,” explains Dr. Mamina Turegano, a board-certified dermatologist at Sanova Dermatology. But if your antiperspirant doesn’t seem to be doing its job, it may not be a faulty product. You could just be applying it at the wrong time.

Why nighttime is prime time

“The best time to apply antiperspirant is actually at night before bed,” says Dr. Uchenna Okereke, a Boston-based board-certified dermatologist. That’s because antiperspirants work best when your skin is dry and your sweat glands are less active. “Think of it like sealing a leak,” Dr. Okereke explains. “You want the pipe dry before you patch it up.”

By the time you wake up, your sweat glands are already sealed off, and the protection should last for 24 to 48 hours—yes, even through a morning shower. “That barrier around your sweat glands is already in place, so a morning shower won’t wash it away,” Dr. Okereke confirms.

What to expect when you switch it up

Worried about skipping the morning swipe? Don’t be. According to both dermatologists, a properly timed application at night offers enough coverage to keep you dry and odor-free all day. For added assurance, you can still use a regular deodorant in the morning for extra odor control.

However, if you’re dealing with night sweats or hyperhidrosis (a condition that causes excessive sweating), over-the-counter options might not cut it. In those cases, prescription-grade topicals may be necessary, says Dr. Turegano.

How to apply antiperspirant the right way

Getting the timing right is important, but so is your technique. Here are a few dermatologist-approved tips to make your antiperspirant work harder:

• Apply it at night to clean, dry skin. If you’ve just showered, make sure your underarms are fully dry before applying.
• Stick to one or two swipes. More isn’t better here. Piling on extra layers can cause irritation without improving performance.
• Use deodorant in the morning if you want extra odor protection. This gives you the best of both worlds: sweat control and a fresh scent.

Most people can safely use antiperspirant nightly, according to both dermatologists. But if you have sensitive skin, starting with every other night might be a gentler approach. Watch out for signs of irritation, such as itching, dryness, or rashes, and adjust your routine as needed.

This simple change in routine could be the low-effort, high-reward solution to staying fresh all day long. So before you swap formulas or double down on morning swipes, try this one easy switch. Your pits (and shirts) just might thank you.