We have previously posted about an "all natural" EPO supplement that is making its way around the industry at the moment. It has been widely promoted in the Blood Horse and other industry publications. The products primary agent was the herb Echinacea angustifolia with the science behind its efficacy in boosting red blood cells in thoroughbreds questionable. It seems that there is another lesser known EPO supplement that is also doing its rounds. The supplement is based on Rh