An examination into the mysterious death of an 18-year-old Ohio teen was revealed to be caffeine overdose.

Keystone High School senior Logan Stiner was found dead in his home in Elyria, Ohio on May 27, a week before his graduation. According to a medical report, Stiner had suffered a cardiac arrhythmia and seizure which led to the teen's death.

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Loraine country medical examiner Stephen Evans said he was initially baffled by the cause of death.

"Because why does a young, healthy person suddenly have a cardiac arrhythmia and a seizure and die?" he told media.

An autopsy found that Stiner had overdosed on caffeine powder. The Ohio prom king apparently had 70 micrograms of caffeine per milliliter of blood in his system, the Associated Press has learned.

Evans said the usual coffee drinker would have only about three to five micrograms of caffeine in the blood.

Caffeine powder is widely available in the U.S. and has grown increasingly popular among teens. It is sold as a dietary supplement and, therefore, not subject to the same FDA guidelines as caffeinated drinks.

For instance, an FDA-approved soda's caffeine limit is 200 milligrams per serving. This is equivalent to about 1/16th of a teaspoon of caffeine powder. However, since the powder is not governed by FDA regulations, it makes it harder to determine the exact recommended dosage across the various caffeine powder brands available in the market, Evans noted.

"You'd have to be a chemist to figure out how much to put in so that you're not in a lethal amount," Evans said.

It must be noted that response to caffeine differs for each person and may be affected by certain factors such as age or certain medical conditions.

In 2012, a lawsuit was filed against Monster Beverage Corp. for allegedly causing the deaths of five people after ingesting their energy drinks. One of the victims in the case involved a 14-year-old girl who had reportedly consumed 480 milligrams of caffeine over 48 hours.

A 23-year-old British man had also died from caffeine poisoning after ingesting two spoonfuls of caffeine powder with an energy drink in 2010.

TagsEnergy drinks, caffeine powder, Monster Beverage, cardiac arrhythmia, Logan Stiner, Stephen Evans, FDA regulations, caffeinated drinks, caffeine overdose, caffeine poisoning, caffeine toxicity