They usually include Nutraceuticals, Functional Foods, and Herbs. Nutraceuticals are generally agreed to be any purified NHP in dosage form. Examples include whey protein isolate from whole milk, and glucosamine sulfate from bovine or shark cartilage. Herbs are simply botanicals that are consumed to treat an illness. Nutraceuticals and Functional Foods are generally consumed on an ongoing basis, and tend to be used as a preventive action against disease.
Herbs tend to be used more as a transitory treatment when horses have a specific illness or problem.