G Fuel is sold at various vitamin shops and is supposed to increase energy and performance for adults going to the gym -- but kids are selling it at school, claiming it helps video gaming performance.

For one child in Massachusetts, taking G Fuel led to a medical emergency.

Dylan Butler, 10, is home from the hospital and back to normal, but just over two days ago he gave his mom quite the scare. She had no idea what suddenly made her son start acting strange.

"He was stumbling down the stairs, he couldn't really walk straight, he was slurring his words, he was just kind of spacing out," Dylan's mother, Josee Torres, said. "He was looking at you and you could tell he wasn't really seeing anything."

Within hours, he was vomiting and in the hospital. But doctors called police when Dylan told them what he had taken earlier in the day at school, saying a classmate gave him the powdery substance.

"They just said it was a Kool-Aid mix and it tasted really good," Dylan said.

G Fuel is manufactured by a company called Gamma Labs. It has a high concentration of caffeine and a normal serving is about a teaspoon for adults. Dylan drank about a quarter cup mixed with water.

"It was kind of scary, because I didn’t know what was happening, I don't even really remember it, I kind of half blacked out," Butler said.

Torres said it's a lesson learned for Dylan and for other parents out there who may not realize the harm it can cause.

"There's so much focus on the drugs and the alcohol and the drinking and everything, you don’t think about that. Especially with a 10-year-old kid," Torres said.

Dylan said he's happy to be feeling better now, but he wants to share his experience because he said lots of his friends were also given the substance. Dylan and his mother worry something worse may happen to another child.