The South African coffee claims to be the world's strongest, packing a whopping 700 milligrams of caffeine per 12-ounce serving, which makes it four times stronger than the average cup of coffee.
But is it safe? According to the Mayo Clinic, a six-ounce serving of Black Insomnia fulfills the average adult's maximum recommended caffeine intake for a single day.
On its website, Black Insomnia touts its caffeine level as "dangerous."
The brew, which is produced by a South African company, is now available for purchase in the United States through the company's website. It will soon be available on Amazon.
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