His "Perky Jerky" gets an extra-long soak in marinade infused with "guarana, " a tropical berry that contains caffeine.

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One is that it contains less caffeine than almost any other form of prepared coffee.

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The Monster spokeswoman said that on a per-ounce basis, Monster contains half the caffeine of some cups of coffee.

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One piece contains 40 mg of caffeine, the same amount found in a half cup of coffee.

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But even decaf contains trace amounts of caffeine, so the authors can't entirely rule out the possibility that caffeine has an effect on health, Freedman says.

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Guarana (aka Guaranine): Guarana is a bean from South America that contains roughly twice as much caffeine as coffee beans.

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Coffee contains many biologically active compounds, including caffeine and phenolic acids, that have potent antioxidant activity and can affect glucose metabolism and sex hormone levels.

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