
Coffee contains a complex mixture of chemical compounds. Some components, particularly those related to the aroma, are produced during roasting of the green beans. The substances which during “brewing” dissolve in water to form the beverage are classified as nonvolatile taste components (including caffeine, trigonelline, chlorogenic acid, phenolic acids, amino acids, carbohydrates, and minerals) and volatile aroma components including organic acids, aldehydes, ketones, esters, amines, and mercaptans.
A cup of coffee, depending on the strength, may contain some 20-100mg of caffeine. Some types of coffee may also contain significant amounts of the B-vitamin niacin, although this nutrient is of course readily available from other foods as well. Caffeine-containing tablets or medications should not be taken as well as cups of coffee or tea, since this would increase the true dosage. The effects of caffeine vary from person to person; some individuals can drink several cups of coffee in an hour and notice no effects, while others may feel a strong effect after just one serving. Caffeine is prohibited for competition athletes.
Related posts:

Does that mean that if caffeine is prohibited for competition athletes, they cannot consume any coffee, tea, or chocolate, or they can’t take caffeine pills? How can a test tell the difference?
Hello retroman, I guess this is still subject to further studies, but right now caffeine and other stimulants is strictly prohibited for athletes at times of the competition this is a universally accepted rule in a game. Thanks for dropping by….