You may need a strong cup of joe to get you up in the morning, but how about one with so much caffeine it could make your heart flutter. Black Insomnia, known to be the “world's strongest coffee” is now available in the U.S. Retailing at $19 a pound, it sells five to six tons of coffee each month, and is even listed on Amazon. The company founder claims that with a caffeine level of mg per fluid ounce, the beans can be brewed to make coffee more than twice as strong as Starbucks' dark roast. Although the amount of caffeine in one ounce is well within the recommended limits, a 12-ounce cup could add up to 702 mg of caffeine. That's way over the FDA recommended 400 mg per day. Experts say unless you've built up a high caffeine tolerance, consuming a cup of Black Insomnia could cause jitteriness, nervousness, restlessness, and trouble sleeping. And the most serious effect would be an irregular heartbeat.
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