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    According to the APA's Diagnostic and Statistical Manual of Mental Disorders, some people can experience caffeine intoxication symptoms -- including restlessness, nervousness, excitement, insomnia, flushed face, and gastrointestinal complaints -- after ingesting as little as 100 milligrams of caffeine per day. At levels of 1,000 milligrams of caffeine per day, symptoms may include muscle twitching, rapid heartbeats, abnormal electrical activity in the heart, and psychomotor agitation.

    Start reading the labels of some of these products, and there are bound to be a few shockers for you. The following is not a complete list of products containing caffeine, but it includes many you would find in a typical supermarket.

    Products with over 300 milligrams of caffeine per serving:

    Product (serving size) Caffeine (milligrams)

    Spike Shooter (8.4-oz. can) 300

    All City NRG (16 oz.) 300

    NOS High Performance Energy Drink (22 oz.) 357

    Products with over 200 milligrams of caffeine per serving:

    Product (serving size) Caffeine (milligrams)

    Arizona Green Tea Energy (16 oz.) 200

    Rockstar Roasted Coffee & Energy (15 oz.) 225

    Rockstar Zero Carb (16 oz.) 240

    Jolt Energy (23.5 oz) 280

    Products with over 140 milligrams of caffeine per serving:

    Product (serving size) Caffeine (milligrams)

    Full Throttle (16 oz.) 144

    Starbucks Double Shot Energy & Coffee (15 oz.) 146

    Go Girl Sugar Free Energy Drink (12 oz.) 150

    Java Monster coffee and energy drink (15 oz.) 160

    Rockstar Juiced Pomegranate (16 oz.) 160

    Rockstar Juiced Energy & Guava (16 oz.) 160

    Monster Energy (16 oz.) 160

    Other products that have more caffeine than you might expect:

    Product (serving) Caffeine (milligrams)

    Jolt Caffeine Energy Gum (2 pieces) 26

    Propel Invigorating Water (20 oz.) 50

    Naked Juice Energy 100% Juice Smoothie (15.2 oz.) 82

    Enviga Sparkling Green Tea (12 oz.) 100

    Crystal Light Energy (16 oz.) 120

    Sodas with caffeine:

    Product (serving) Caffeine (milligrams)

    Jolt Cola (12 oz.) 100

    Diet Pepsi Max (12 oz.) 69

    Vault Citrus Hybrid Energy Soda (12 oz.) 69

    Mountain Dew (12 oz.) 54

    Pepsi (12 oz.) 38

    Diet Coke Plus with vitamins and minerals (12 oz.) 34

    (If you are wondering why Red Bull Energy Drink isn't in any of the charts above, it's because it has 80 milligrams in an 8.4-ounce can, which wasn't half as shocking as the caffeine totals in some other energy drinks on the market.)

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