‘World’s strongest coffee’ can give you heart palpitations

The ‘world's strongest coffee’ is so strong, it will drive you over the daily caffeine limit and give you heart palpitations. Created in Cape Town, South Africa, Black Insomnia Coffee is now available for purchase in the U.S. One cup of Black Insomnia Coffee contains 702 mg of caffeine, which is twice as strong as Starbuck's dark roast and exceeds the FDA's daily limit of 400 mg. Mary Sweeney, a researcher at John Hopkins School of Medicine, said that the coffee brand will give you double the amount of caffeine for the same amount of coffee. Mary Sweeney Black Insomnia founder Sean Kristafor is aware of the limits and issued warnings on the coffee’s labels. Sean Kristafor