A new minimum reporting level (MRL) for the banned substance metformin has been proposed by HISA's Anti-Doping and Medication Control (ADMC) Committee, according to a HISA release Monday. The proposed MRL is 4.0 nanograms per milliliter in blood and is based on recommendations received at HISA and HIWU's request from the Racing Medication & Testing Consortium's (RMTC) Scientific Advisory Committee (SAC). The modification will be circulated for public comment in the coming days. Following a series of positive test results for metformin and what Monday's HISA release called, "intelligence received...