Non-invasive pulsed light therapy (phototherapy) treatments are thought to enhance hair growth through stimulation of energy production in hair follicles, improvement of the scalp micro circulation and reduction in dihydrotestosterone (DHT) levels (and thereby further minimizing additional hair loss). Controlled studies have shown improvement in hair follicle density compared to sham treated controls. Higher energy treatments available in physicians’ offices are short and painless with more frequent sessions (e.g. twice per week) in the beginning of the treatment plan. Lower energy home treatment systems are also available.