Hi there-- IPL targets pigment, and the darker your skin, the more risk of complications including hyperpigmentation and burns. Second, to clarify another person's answer, IPL has an overall rejuvenating effect on the skin, but there is no significant skin tightening.
IPL works for skin tightening with your skin type but if your goal is to have your complexion treated with IPL I would definitely discourage it. I treat a great deal of patients with dark skin and many of whom have had side effects by lasers. Please consult an expert in African American skin for the best treatment results. Best, Dr. Green