Does Monster low carb have caffeine? Yes, it does.
                                
                                
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                                    3 min read                                
                            
                                According to the official Monster Energy website, a standard 16-ounce can of Monster Lo-Carb contains 140mg of caffeine. This confirms that the low-carbohydrate version of the popular energy drink does, in fact, contain a substantial dose of caffeine, providing the 'big bad Monster buzz' that consumers expect.