Former WBO cruiserweight champion Enzo Maccarinelli has been given a six-month anti-doping suspension, UK Anti-Doping have confirmed.
The 31-year-old Welshman, best known for surrendering his title to David Haye in 2008, tested positive for methylhexaneamine (MHA) on March 23 following a win over Shane McPhilbin.
His ban was backdated to April 19 and will expire on October 18.
UK Anti-Doping Chief Executive Andy Parkinson said: "This is a timely reminder that, no matter what your sport, under the principle of strict liability athletes must exercise extreme caution over what they put into their body.
"With this in mind, Olympic athletes should be aware that they are now in-competition from 16 July until 12 August and could be tested at anytime, anywhere. MHA is available in a range of supplement products, is banned in-competition, and can often be listed under a number of different names.
"UK Anti-Doping continues to work closely with the British Boxing Board of Control to maintain the integrity of the sport."