Male pattern baldness (MPB) is the genetic condition responsible for 95% of all male hair loss. It starts with a receding hairline and less obviously, thinning around the crown. If it continues to develop, hair loss can be significant. The end stage of MPB is recognisable by a horseshoe crescent of hair around the back of the head. MPB is associated with high levels of testosterone, nutritional deficiencies and a diet high in animal fats.