Equi-Nox is a Vitamin E supplement for horses that increases performance and strengthens the immune system of the creature.  Very low amount of naturally occurring Vitamin E are available in today's feeds.  It is easily destroyed in processing, drying and even when we storage the feed.  Adding up with an oral source of Vitamin E is an excellent way to get the proper levels of it in your horse's feed. So the efficiency of vitamin E can be reduced by Equi-Nox supplement in the horses feed.