Anhydrous caffeine is a powdered form of caffeine that has had all of its water content removed. It is a central nervous system stimulant that is commonly used to increase alertness, energy, and focus. In protein powders, anhydrous caffeine is often added to provide a boost of energy and to enhance athletic performance.
However, it is important to note that anhydrous caffeine is a potent substance, and consuming too much can lead to a range of negative side effects, such as jitteriness, anxiety, insomnia, and heart palpitations. The U.S. Food and Drug Administration (FDA) recommends a maximum daily intake of 400 mg of caffeine, which is roughly equivalent to the amount in four cups of coffee.
In addition, anhydrous caffeine can be particularly dangerous when consumed in high doses or when combined with other stimulants or medications.