We all have or will at some point in the future, feed our horses a supplement. Electrolytes for hard workers, biotin for the cinderella's, Ulcerkind for the worriers, calmers for the neurotics, but do any of us actually understand how they work? Equine America's Senior Nutritionist Deborah Leabeater joins us, with Tess in full #BiologyExcitement mode, to talk through how she became a nutritionist, why chewing on bark is good and not a piece of evidence to hand to a mental health nurse, why electrolytes are so damn important (and no you can't just use table salt) AND all the new and unbelievably exciting places that supplement research is going.