4Ever Fit Caffeine is an alkaloid; of which there are numerous compounds such as the methylxanthines, with three distinguished compounds: caffeine, theophylline, and theobromine, found in guarana, kola nuts, coffee, tea, cocoa beans, mate and other plants. These compounds have different biochemical effects, and are present in different ratios in the different plant sources. Because of its diolated blood vessel restricting properties, it is used to treat migraines, through the reduction of pain. It increases the potency of aspirin or other analgestics and can relieve asthma attacks by widening the bronchial airways. The majority of caffeine is produced in decaffeinating coffee.