I have been using Calf-Manna since 1973 and I will continue to use it as long as I have horses. I have used it on every horse I've had and even on my 24 year young Peruvian Stallion, it makes him look like he's 12, outside of his gray hairs! This is the best product, for me and my horses, on the market. All the right vitamins and minerals added to their grain makes a healthy horse: shiny coat, good body weight, good overall health. I use Horse Manna when I can't find Calf-Manna and in it's concentrated form, still does the same job. Manna Pro knocks it out of the park with their products. Keep up the great job making great supplements and horse supplies.