InsulinWise by Wiser Concepts
This product was recommended by my vet for our insulin resistant TWH mare. She has been on this product for almost a year and is doing very well. She can be a picky eater but she doesn't leave anything in her feed tub. I will continue to use InsulinWise until my vet says otherwise. The folks at KBC are very nice and the price for this is the best I've found to date.