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MELBOURNE, AUSTRALIA - AUGUST 22: Participants tip buckets of ice water over their heads as they take part in the World Record Ice Bucket Challenge at Etihad Stadium on August 22, 2014 in Melbourne, Australia. Over 700 people took part in setting the new world record. The Ice Bucket Challenge is the social media phenomenon which is helping raise awareness and money for sufferers of Motor Neurone Disease. (Photo by Scott Barbour/Getty Images)

TikTok has an ice water hack to help cure a hangover. A trend on the platform has people dunking their heads in a bowl of ice water to help ease the symptoms of their hangovers. Known as the “ice bowl trick” or the “ice bowl challenge,” fans claim it really works, while others aren’t so sure about the results.

In one clip, user Andreana “Anna” Tay gives the chilly method a try, holding her face underwater for 10 seconds, before taking a break to recover and plunge it in again. “Oh my God, it works,” she says at first, but quickly changes her mind, adding, “No it doesn’t. What the f—, it doesn’t.” Another TikToker who posted a video of herself dunking her face in a bowl of ice water also wasn’t happy with the results, captioning the clip, “Whoever told me to put my face in a bowl of ice water to fix my hangover was lying.”

So does it work? According to pharmacist Dr. Chris Jackson, it does. In his own TikTok video, he explains that the trick activates the “diver’s reflex.” This is a biological response that keeps mammals alive in oxygen-deprived underwater conditions, according to Dartmouth. “Put your face in a bowl of ice water, let the water hit your nostrils, and hold your face in the water for 5-10 seconds up to 3x. This will activate the diver’s reflex and help with nausea,” Jackson explains. “It’s also great for anxiety, migraines, and your skincare routine.”