People were in disbelief after a TikToker revealed how long caffeine stays in your body for.
Owen Newland, whose TikTok username is @owen.newland, shared the video on the social media platform to inform people. Standing in a bar, Owen said he "couldn't believe" people didn't know the true effects of the stimulant.
The TikToker begins with showing people a can of Monster, an energy drink. He said the maximum "human intake" a day is 400mg, the equivalent of two and half of the Monster cans.
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Owen said: "I know people who have four of these, buy the full pack and have them all. I used to have eight, I almost went blind because of it.
"I put it on my Instagram story how long do you think it takes caffeine to get in your system? The answers were one hour, two hour, 20 minutes, 15 minutes.
"People were choosing one of two hours, three and four hours. It is 15 to 20 minutes it takes caffeine to hit your system. How long do you think caffeine stays in your system for?
"One hour, two hours, three hours, five hours, ten hours? People were choosing one hour, two hours. 10 hours it stays in your system."
Owen went on to explain that if a person has a can of Monster at midday, it would still be in a person's system at 10pm that night. He said this is why people wonder why they can't sleep when they have a can of Red Bull at 4pm.
After watching the video, one person said: "Today I learned that I never not have caffeine in my system." Another added: "Omg this is why I couldn't sleep the other night because I had a Monster before bed."
A third person said: "I had three pacific ones in a day and woke up with heart palpitations."
The NHS said energy drinks often contain high levels of caffeine and are often high in sugar (calories). They may also contain other stimulants, and sometimes vitamins and minerals or herbal substances.
The caffeine levels in these drinks vary, but there's often around 80mg of caffeine in a small 250ml can. This is the same as two cans of cola or a small mug of coffee.
Health organisations around the world suggest that most people can safely consume up to 300mg of caffeine a day. Some people are advised to consume less though. The NHS suggests that pregnant women consume no more than 200mg, or two cups, of caffeinated coffee a day.
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