With Boldenon in moderate doses aromatisation is usually not a problem to worry about. But it does aromatise a little so if you are sensitive or uses Boldenon in high doses there is still a reason to look out. This means that the risk of side effects like gynocomastia and water retention is small. The small aromatisation that does occur is positive for the glucose utilization (bringing back glycogen in the cell after a hard workout) and increases your natural growth hormone release. The main advantage is that oestrogen upgrades the androgen receptors giving an anabolic effect. Boldenon is not so toxic for the liver and the DHT conversion is also low. Acne and high blood pressure problems are also rare, this steroid is in all fairly safe to use and very much recommended.
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.