For perspective, a standard 12-ounce cup of coffee has around 150 milligrams of caffeine, and a Red Bull boasts around 108.
Newly retired coffee lover Sean Kristafor founded Black Insomnia in June 2016.
According to the U.S. Food and Drug Administration, adults should not have more than 400 milligrams of caffeine in one day, as too much consumption could lead to "headaches, insomnia, muscle tremors, irritability, and rapid heartbeat".
Researchers say that a cup of coffee may cause heart palpitations.
"Death Wish", a coffee that's been sold as the world's strongest coffee in the past is now being forced to step aside, as there's a new sheriff in town.
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Introduced past year in South Africa, the coffee contains 702 milligrams of caffeine per 12-ounce cup. On its website, Black Insomnia touts its caffeine level as "dangerous".
Is this the world's strongest coffee?
In comparison with Starbuck's dark roast, Black Insomnia is more stronger. "This makes it easier to consume more caffeine than you intend to and effects can range from mild to severe, for example, jitteriness, nervousness, restlessness and trouble sleeping".
Black Insomnia's number one competitor is Death Wish, which is also a very strong type of coffee.
"So here's the thing, don't come crying to us if you can't handle the kick", the company said. But for items like coffee beans, the FDA counts caffeine, not as a nutrient, but rather a natural chemical.