Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
Welcome to my forum.
Here you will find more than 6 years of questions and my answers. It is searchable and offers a great deal of information.
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All the best,
Dr. Getty
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