methylxanthine

Methylxanthines are natural chemicals found in plants like coffee, tea, cacao, and certain herbs. They act as stimulants by blocking a chemical in the brain called adenosine, which promotes relaxation and sleep. When adenosine is blocked, it enhances alertness, improves mood, and can increase energy levels. Common methylxanthines include caffeine, theobromine, and theophylline. These compounds are widely consumed and can affect the nervous system, heart, and digestive system. While they can boost alertness, excessive intake may cause side effects like jitters or insomnia.