Welsh Premiership player Lee Evans has received a two-year ban from all sport after an anti-doping rule violation.
Neath player Evans, a former captain of the west Wales club, tested positive for the anabolic steroid drostanolone following an out-of competition test conducted last summer.
UK Anti-Doping (UKAD) confirmed the Evans decision on its official website, with the 32-year-old suspended until 27 July, 2016.
UKAD director of legal Graham Arthur said: "Mr Evans maintained that the banned substance had entered his body because of the supplements he was taking.
"While the panel agreed that there was some evidence to support Mr Evans's claim, it concluded that he hadn't undertaken any serious research into the supplements which contained prohibited substances.
"This failure has resulted in a two-year ban.
"Supplements are a known risk and there is no guarantee that they are ever free from banned substances. If an athlete chooses to take a supplement, they should always undertake thorough research before use."
Evans, who has completed a UKAD anti-doping advisor's course, will now work with the Welsh Rugby Union to deliver education to players.
In a statement released by the WRU, Evans said: "While I did not set out to cheat in any way, I was naive and I have suffered as a result.
"I failed a drugs test after taking supplements without making the appropriate checks as to whether they contained banned substances.
"After what has happened to me, I would like to help ensure that doesn't happen to others in the game and that all players are fully aware of the importance of checking each and every ingredient contained in the supplements.
"Anyone who doesn't do this puts themselves at risk."