The company claims its product is safe, but the Center for Science in the Public Interest issued a 2012 report warning consumers to avoid it until the FDA can resolve safety issues. Warning: 5-Hour Energy has come under federal scrutiny as a contributing factor in 13 deaths, due to the high caffeine content and other ingredients. Someone who consumes 40 milligrams (mg) of caffeine will have 20 mg remaining in. Caffeine has a half-life of about 5 hours. Want a bigger buzz? Extra-Strength 5-Hour ENERGY claims to have as much caffeine “as a 12-ounce cup of coffee.” No lab results are available, so it’s unclear how much caffeine this version actually contains. Caffeine may have a greater effect on people who are sensitive to it. = more than a Starbucks “short” (180 mg/8 ounces) The result: 207 mg – far more caffeine than in a cup of coffee. A 1.93 fl oz bottle has a total of 230 mg of caffeine. The Institutional Review Board at Northern Kentucky University. Demographic characteristics and typical caffeine use and typical use of 5-Hour Energy ® are presented in Table 1. All participants had normal color vision and normal or corrected-to-normal 20/20 vision. But how much caffeine is that? The company won’t reveal how many milligrams of caffeine each 2-ounce shot contains, but CBS News had a bottle analyzed by . 5 Hour Energy Extra Strength contains 119.17 mg of caffeine per fl oz (402.97 mg per 100 ml). The majority of participants (64) had tried 5-Hour Energy ® at least once. “It contains about as much caffeine as a cup of the leading premium coffee,”say the ads for 5-Hour ENERGY shot.
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