Two horses trained in the United Kingdom by Suzi Best have been disqualified by the British Horseracing Authority after post-race samples detected minoxidil, a vasodilator that is also an ingredient in a hair regrowth product sold in the United Kingdom under the brand name Regaine (Rogaine in the United States).
The two runners, Outrath and Ertidaad, were victorious at Kempton Park last February, according to the Racing Post. Both horses were cared for by assistant Tom Best, the trainer's brother in law who the Racing Post reported has been using Regaine shampoo for seven years. The BHA reportedly accepted the explanation that contamination from the hair regrowth product led to the positive test.
A statement from Suzi Best reported by the Racing Post as read by the BHA's director of integrity and regulation, Tim Naylor, stated: “As the horses were under my care and control I take full responsibility even though I had no reason to believe it could result in a positive, my assistant has been using the product for many years and neither of us had the slightest idea this could happen.
“As the trainer I take full responsibility for the unfortunate circumstances that led to the positives and am devastated.”
This is not the first time hair regrowth products have led to a hairy situation in drug testing. In 2015, a show-jumping horse tested positive for minoxidil in South Africa. An investigation determined that the horse had been accidentally contaminated with the substance by the horse's owner, who was trying to thicken his thinning locks.
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