The amount of caffeine in one of the energy drinks, 150 mg, is roughly equivalent to two-and-a-half cups of instant coffee, if they are eight ounces each,according to the Mayo Clinic.

It's unclear how much caffeine is safe or unsafe for teens or young children, since studies of its effects are not permitted in children.

\"PHOTO:
Karl-Josef Hildenbrand/picture-alliance/dpa via AP
PHOTO: Different energy drinks are pictured Feb. 26, 2018 in Kaufbeuren, Germany.
>

For adults, the FDA has cited around 400 milligrams of caffeine a day as an amount not generally associated with dangerous side effects.

The American Academy of Pediatrics (AAP) advised parents in a 2011 report to keep kids and teens away from energy drinks over concerns about the high levels of caffeine.

\"Energy drinks contain substances not found in sports drinks that act as stimulants, such as caffeine, guarana and taurine,\" the AAP said in a statement at the time. \"Caffeine –- by far the most popular stimulant –- has been linked to a number of harmful health effects in children, including effects on the developing neurologic and cardiovascular systems.\"

In addition to those additives, energy drinks can contain kola nut, yerba mate and cocoa, which bring additional caffeine, according to the report published in Pediatrics.

\"PHOTO:
STOCK PHOTO/Getty Images
PHOTO: A teen is pictured drinking in this undated stock photo.
>

In 2011, there were 1,499 adolescents aged 12 to 17 who went to emergency rooms for an energy drink related emergencies, up from 1,145 adolescents in 2007, according to the Centers for Disease Control and Protection.

Side effects of excess caffeine consumption by children include anxiety, jitteriness, headache, fatigue, irritability, elevated blood pressure and heart palpitations, experts say. The effects can be serious if the child has an underlying heart issue.

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