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Fortunately for NOS drinkers, the company decided to lower the drink’s caffeine content from 260 milligrams of caffeine to 160 milligrams in a 16-fluid-ounce can. Unfortunately, the caffeine content is still too high, and some retailers still sell the older version of the product. According to livestrong.com, NOS Energy drinks can cause diarrhea, delayed muscle recovery, nerve damage, increased risk for diabetes, and anxiety.