Cialis is a sexual performance enhancer that has been banned by the World Anti-Doping Agency. Some bodybuilders claim that it increases pumps and decreases recovery time in-between workouts.3 Cialis also improves blood flow, allowing for enhanced nutrient and oxygen delivery to muscles during workouts, leading to greater stamina and more effective muscle growth.0 However, the benefits of nitric oxide, a key ingredient in many legal bodybuilding supplements, are unclear.1 Cialis also lowers blood pressure, which is a concern for many bodybuilders due to strokes, heart attacks, and blockages.2 Evidence suggests that Cialis and Viagra increase testosterone, which may increase libido via this mechanism.