Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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All the best,
Dr. Getty
Hi Suzanne!
What an interesting fellow you have! 
Certainly, he could be more eager to be outdoors and play than eating. That's a good sign because it shows that he's satisfied and as long as he does eventually eat, there is no need to be concerned. I expect that he's feeling better, his stomach is not bothering him, and his nervous system is healthy and calm from the B vitamins you're providing, along with the low starch diet.
Regarding the Vitamin E and selenium... 4.5 lbs of Ultium provides approximately 1.1 mg of Selenium. The label does not give the amount of vitamin E, however, I would expect that it is not more than 100 IU per lb (though this is an estimate). So, he's getting approximately 450 IU of vitamin E, using my assumption.
This level is adequate, though not optimal. If he is being exercised, he could do with some more vitamin E and your soils are low in selenium, so you may want to consider adding a small amount of a supplement. I would recommend Su-Per Natural E/Se and only give him one scoop per day. This will provide an additional 1000 IU of vitamin E and .5 mg of Selenium, bringing his total intake up to optimal levels.
All the very best,
Dr. Getty 
Where are you from? Bayfield, CO
Hi Suzanne,
There has been recent evidence to support the benefits of hyaluronic acid, fed orally. Injections are more direct, it's true, but over time, they can be problematic so I don't recommend them for the long term. Reitsport HA-100 is a complete product and would be worthwhile.
I seem to recall that I originally recommended Ration Plus because of your horse's ulcer. If this is the same horse, I would suggest that you continue feeding Ration Plus, in addition to the Reitsport HA-100 because Ration Plus feeds the existing bacteria to keep them healthy. And, whenever there is a problem with the digestive tract, the health of these micro-organisms is very important.
The probiotic in Reitsport does support the digestive tract by adding some of the microbes that exist there. But in the case of an ulcer, it is worthwhile to provided the added support from the prebiotic (Ration Plus) to feed the many different types of microbes living in the hind gut.
All the best,
Dr. Getty
Where are you from? Bayfield, CO