Coca, often associated with the coca plant, is a source of several alkaloids, including caffeine. Caffeine is a natural stimulant that affects the central nervous system, leading to increased alertness and reduced fatigue. It is commonly found in beverages like coffee, tea, and energy drinks. The coca plant is native to South America and has been used for centuries by indigenous cultures for its stimulating properties. While caffeine is widely consumed and generally considered safe in moderate amounts, excessive intake can lead to side effects such as insomnia, jitteriness, and increased heart rate.