Lysine is an essential amino acid, which means horses can only get lysine through their diet. Lysine is needed for protein synthesis, and if not getting enough lysine, it can restrict protein availability. So, if a horse is getting protein, but deficient in lysine, they can still be protein deficient. 

Another essential amino acid, methionine supports the health and integrity of a horse's tendons, ligaments, connective tissues and joints. Methionine is also a building block of keratin, which is needed to form healthy hair and hooves.

Threonine is an essential amino acid, which plays an important role in healthy immune function and gut health, helping to build a healthy gut lining. 

Vitamin E is fat-soluble vitamin and an antioxidant, and high levels are needed for horses with poor quality hay or pasture or horses that have undergone stress & training. Vitamin E is needed to support the horse’s immune system and protect cells, reducing tissue inflammation and protecting from free radicals. 

Magnesium is a macro mineral that plays a vital role in nerve and muscle function. Horses that are deficient in magnesium can show signs of nervousness, tension, excitability, stress and muscle tremors. 

Magnesium is also believed to help in reducing equine obesity and can reduce the risk of laminitis. 

Prebiotics are 'fuels' that aren't digestible by the horse but instead feed and nourish the good microbes in their gut.

Probiotics are 'life microbes' and feeding them adds good living microbes to the gut, stabilising and promoting a healthy microbial population.

Without a good microbial population in the hindgut, a horse is not able to effectively digest plant fibre material.