Boldenone undecyclenate is generally injected every four or five days but some people will inject every day while others will inject once per week. The longer half-life of the undecyclenate ester would dictate an injection frequency of every 10-14 days but there has been a trend towards more frequent dosing by AAS users even with drugs known to have long half-lives. Dosing is generally kept pretty low (300-500 mgs per week) however the low binding affinity would argue for doses twice that which would be taken with testosterone. The anabolic to androgenic ratios are favorable for boldenone however people do not consider boldenone to be a particularly potent steroid, possibly due to the low doses that are utilized. Also, boldenone does not cause much water retention so many people assume it is not working if they do not put on ten pounds in one week. Boldenone is said to cause an increase in vascularity. There is no mechanism to explain why boldenone would do this anymore than any other AAS.
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.