Stephan Bonnar and Josh Barnett , mixed martial arts (MMA) fighters from the UFC and PRIDE Fighting Championships , have also tested positive for the banned substance.  After the World Extreme Cagefighting show on January 20, 2006 Muay Thai turned MMA fighter Kit Cope also tested positive for boldenone.  Following the Strikeforce card on June 22, 2007 former PRIDE and UFC fighter Phil Baroni tested positive for boldenone, as well as stanozolol .  At a K-1 WGP event in Las Vegas on August 17, 2007 two fighters, Rickard Nordstrand and Zabit Samedov , both tested positive for boldenone.  Alexandre Franca Nogueira tested positive for boldenone in July 2008. 
Although anabolic androgenic steroids like Boldenone may increase lean muscle mass, strength, and the ability to train longer and harder, the serious side effects of steroids are many and may not be reversible. The minor side effects of steroid use include acne, oily skin, excess hair growth, and deepening of the voice. The major side effects of steroid use include an increased risk of cancer, increased risk of heart and liver disease, jaundice, fluid retention, reduction in HDL-C (“good cholesterol”), high blood pressure, changes in blood coagulation, increased risk of atherosclerosis, swelling of the soft tissues of the extremities (edema), and obstructive sleep apnea.