Caffeine is a white crystalline xanthine alkaloid stimulant drug that acts as a stimulant drug. This bitter alkaloid is part of chemical mixtures found within insoluble complexes guaranine which is found in guarana, theine which is found in tea, as well as mateine which is found in yerba mate.

Caffeine is found in different quantities within leaves, beans, and even some fruit. For the most part humans use caffeine that has been extracted from cherries of the coffee plant as well as the leaves from the popular tea bush. Occasionally you can find caffeine as as source from the kola nut, guarana berries, Yaupon Holly, and yerba mate.

There is great debate regarding the pros and cons to caffeine, as well as it's effects on the body. For starters caffeine is first and foremost a central nervous stimulant. Because of this caffeine can help to fight off drowsiness thus increasing the ability to focus needed attention. Some of the most popular drinks that contain caffeine are tea, coffee, energy drinks, and even the common soft drinks. Because of this these drinks are very popular among most all people. In fact caffeine is the most widely consumed psychoactive substance in the world. Here the debate often turns to the fact that caffeine is also not regulated in most parts of the world. Statistics show that more than 90% of North American adults consume caffeine on a daily basis.

The group that I would like to discuss regarding possible negative effects in particular is that of body builders and weightlifters. Caffeinated drinks are also very popular among this group. Besides possible nervousness, anxiety, tremulousness, insomnia, muscle twitching, respiratory alkalosis, stress, gastrointestinal problems, adrenal exhaustion, premature aging, headaches, and heart palpitations, caffeine can also be very constricting when it comes to blood flow and muscle growth, the very thing that a bodybuilder and weightlifter strive after. In fact caffeine limits blood flow and this is exactly what you don't want. When the blood flow is restricted muscle growth is stunted. This is definitely the last thing that you could want if your goal is to grow your muscles.

For this reason it is suggested that when taking a muscle builder of any kind, such as a creatine, that you chose one without the stimulant caffeine. In fact there are many supplements that you can take to help build muscle that have no trace of stimulants like caffeine. Caffeinated muscle builders have been shown to reduce the benefits of different creatines and NO2 by constricting blood vessels. As a vessel constrictor it significantly decreases the ability to get the benefits of a lot of ingredients found in supplements. For example if you are taking caffeinated creatine, it will actually decrease the likelihood that the creatine will effective reach you targeted muscle group. Because of this it is extremely important that you don't use any blood constricting supplements that contain caffeine.