American golfer Scott Stallings has been suspended until early October after confessing to taking banned substances.

Stallings called foul on himself after realising that a supplement that was recommended by his doctor was on the banned list.

The three-month ban means that the 30-year-old will be allowed to return to action for the start of next season.

"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," he said in a statement.