Like vitamin E the B vitamins help in the functions and the metabolism of many of the other vitamins. A horse can manufacture his own Niacin from vitamin E.
There is still much to learn yet about B complex vitamins.
This is a reproduction of an article written by Bud Wrona as it was published for the local Redmond (WA) paper, in a column titled "Off the Hoof," which was created to help educate the community on, mainly, the proper care and feeding of horses. Some of the information might be outdated (unfortunately, we don't have the original publish dates) so please leave a comment if you happen to notice something that is.