Caffeine is a naturally occurring stimulant found in the fruit, leaves and beans of coffees, cacao and guarana plants. It is usually added to beverages and supplements such as chocolate covered coffee beans, coffee, energy drinks, expresso, sodas, green tea, black tea, dark chocolate, coffee liquor, and baking goods containing chocolate. Its stimulant properties are often promoted in pre-workout supplements as it is an effective energy-boosting supplement that works best when taken one to two hours before workout and helps to increase endurance for high-intensity exercise. In this study, the caffeine content of several pre-workout supplements was determined using spectroscopic and chromatographic methods. Results showed caffeine content that are close to each other using the two methods.

Caffeine content of pre-workout supplements

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