The original Red Bull energy drink has less caffeine per serving than Celsius, but it contains added sugars that most people try to avoid. Red Bull also contains more artificial ingredients, which are all FDA-approved, which might impact a consumer's decision between the two products.

A can of Monster has significantly more caffeine than a can of Red Bull, with about 160 mg per can. However, one can of Monster is bigger than one can of Red Bull. Red Bull contains about 8.4 ounces of liquid and Monster contains about 17 ounces of liquid.

CELSIUS is the ideal drink for anyone who wants to get the most out of their day and live fit. Backed by several clinical trials, drinking CELSIUS prior to fitness activities is proven to accelerate metabolism, burn body fat and provide essential energy.