PGA Tour professional Scott Stallings was handed a three-month ban, after he violated the tour's doping code.
Scott Stallings will serve a 90-day ban from the PGA Tour, after discovering he had inadvertently violated the tour's doping rules.
Stallings, a three-time winner on the US tour, owned up to officials after learning the supplement he had been taking - known as DHEA - was considered a performance-enhancing one.
The 30-year-old said he was advised to take the supplement by his doctor, and claimed he was taking the substance - which was to deal with an "incredible amount of fatigue" - during the Humana Challenge in January, when he did not produce a positive test.
"I discovered in February 2015 that I had inadvertently taken a supplement for the prior two months that was not permitted by the PGA Tour," Stallings' statement read.
"I did so on the recommendation of my physician due to chronic fatigue I had felt over a period of time " not in any way for performance enhancement.
"I immediately self-reported this fact to the PGA Tour - consistent with my values and with the long tradition of self-reporting all rules violations on or off the golf course.
"I regret my inadvertent mistake in not doing my homework to know for sure what was on the list of permitted and non-permitted substances.
"I take responsibility and accept the penalty imposed by the PGA Tour."
Stallings received a three-month ban, and will be eligible to appear back on tour from October 7.
He has just one top-60 finish to his name in his past 12 tournament starts - missing the cut in seven - since losing a play-off to Jason Day at the Farmers Insurance Open in February.