Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class. It is the world's most widely consumed psychoactive drug. Caffeine anhydrous powder is a highly concentrated form of caffeine that is commonly used as a stimulant and energy booster. It is often added to dietary supplements, energy drinks, and weight loss products to enhance mental alertness, improve physical performance, and reduce fatigue. Caffeine anhydrous powder is also used in the pharmaceutical industry as a central nervous system stimulant and as a treatment for respiratory depression. However, it should be used with caution and in moderation, as excessive consumption can lead to adverse effects such as anxiety, insomnia, and heart palpitations.