What is hypochlorous acid? A disinfectant ingredient that helps against acne and body odor

A powerful ingredient used in disinfectants and cleaning products, it is now considered a panacea for reducing acne and body odor. Hypochlorous acid, a bacteria-fighting compound, is a trendy skincare ingredient in many facial mists – and is actually gentle even on sensitive skin.

The body naturally produces hypochlorous acid to fight infections and germs. Studies have shown that using this anti-inflammatory compound is beneficial for eczema-related itching, wound healing, and scarring. However, the evidence that acne can be relieved is less clear.

“We don't really have good data on whether this is a drug to prevent or treat acne, but intuitively and scientifically it makes sense that if you can reduce some of the bacteria and inflammation on the skin, you can reduce acne,” Deirdre Hooper, MD, a board-certified dermatologist and co-founder of Audubon Dermatology in New Orleans, Louisiana, told Verywell.

Some people may benefit from hypochlorous acid, but overuse of these products can disrupt the skin barrier, cause inflammation and damage the skin's healthy microbiome, Hooper added.

Studies have shown that an imbalance between good and bad bacteria on the skin can contribute to acne.

“The nice thing about these products is that they're safe as long as you don't over-clean them, so I think it's worth a try,” Hooper said.

When should you use hypochlorous acid?

Some TikTokers say they use hypochlorous acid sprays after a sweaty gym session to avoid breakouts. Hypochlorous acid can reduce the buildup of oil and bacteria that can lead to post-workout acne, but it's not the only option.

“Acne has many different causes and as with most acne treatments, we need to take different approaches and this is just one of them,” Arielle R. Nagler, MD, associate professor of dermatology at NYU Langone Health, told Verywell.

It may also be helpful to remove makeup before exercising and wash your face with a gentle, oil-free cleanser afterward. Another option is to pat sweat from your face while exercising – but don't rub – as this could irritate the skin.

“I always tell people to bring a snack bag with an ice cube and a paper towel to get the sweat off their face as quickly as possible when they're sweating and exercising. Don't let it build up and eventually just wash it off,” Amy S Paller, MS, MD, a board-certified dermatologist and chief of dermatology at Northwestern Medicine, told Verywell.

Some people also spray hypochlorous acid under their armpits after leaving the gym to reduce body odor, which can help over time.

“If people are worried about the smell after exercise, they might benefit from [hypochlorous acid]”I would think they would have to use it regularly and not just inject a little bit here and there,” Paller said.

How should you choose a product containing hypochlorous acid?

If you plan to use hypochlorous acid on your face or body, Paller says you should look for a low-concentration skin spray rather than a household cleaner.

There are many skin-safe hypochlorous acid sprays available, but it's important to check the labels first. Hooper recommends looking for fragrance-free hypochlorous acid products, as added fragrances can irritate sensitive skin.

Many people can safely use products containing hypochlorous acid as part of their skin care routine, but better results require time and consistent use.

“Wait about four to six weeks, and if you don't see a change in your acne, it may not be something that's going to help you,” Hooper said.