Vitamin and Mineral Supplements in the last 30 years became such a lucrative market in human nutrition that it was quickly taken up by the Animal Feed and Veterinary Supply Industries. There are a wide range of such products marketed especially for horses. Let us consider some of the natural sources of Vitamins and Minerals one at a time. Otherwise let a few dandelions grow around the yard and the Horse will chose them for itself. Not needed as a supplement for grazing animals.
Wheat germ is a commercial source of both E s and B s.
A little fresh wheat germ for those horses not on grains is all that is required. Anything more expensive or more processed is nonsense. It all boils down to Grains, Green Feed, Wheat Germ, Molasses, Carrots, Rosehips and Kelp. To this I would add Garlic as a protection against infection and provide access to the odd weed like Dandelion and Comfrey. Robert McDowell Herbalist September 1999.