American golfer Scott Stallings has been suspended for three months for violating the PGA Tour's anti-doping policy, making him the third player to be sanctioned for performance-enhancing drugs since the policy was introduced seven years ago.

Stallings said in a statement released Tuesday by the PGA Tour that he took a supplement to help with chronic fatigue and turned himself in when he realized in February that it was on the list of banned substances.

"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," Stallings said. "I take responsibility and accept the penalty imposed by the PGA Tour."

The suspension means the 30-year-old Stalling is out for the rest of the season. He would not be eligible to return until Oct. 7, the week of the Presidents Cup in South Korea. The 2015-16 season opens the following week at the Frys.com Open.

Doug Barron, who had not had a full PGA Tour card in three years, was suspended for one year in October 2009 for taking a substance to cope with low testosterone. His lawsuit against the tour was settled and he was granted a therapeutic use exemption the following year.

In January, Bhavik Patel on the Web.com Tour was suspended for taking a banned substance. Patel said he had a lapse in judgment.

Stallings is the first PGA Tour winner to be suspended. He has won three times in five years, most recently in 2014 at Torrey Pines. (hhr)

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