Downhiller Chelsea Redwood has accepted a two-year suspension for testing positive for the appetite suppressant phentermine.

Redwood, 34, of Big Bear Lake, California, tested positive September 26 during the U.S. Mountain Bike National Championships at Mammoth Mountain, California, U.S. Anti-Doping Agency officials announced Saturday. She finished 14th in the pro women’s DH, racing for Turner-No Brakes Racing.

She told officials she used the substance for weight loss without knowing it was banned by the Union Cycliste Internationale.

Under the terms of the suspension, Redwood was disqualified from the September race and will be ineligible to compete for two years from the date of her positive test.