The Anagen Phase is the active growth stage of the hair cycle, where hair follicles produce new hair. This phase can last for several years, depending on factors like genetics and health. During this time, hair grows continuously, and the length of the Anagen Phase determines how long hair can grow before it enters the next stage. In humans, the Anagen Phase typically lasts 2 to 7 years for scalp hair, while body hair has a shorter duration. This phase is crucial for maintaining healthy hair, as it allows for the maximum length and thickness before transitioning to the Catagen Phase and Telogen Phase.