Because marketing people playt with words as there is nothing that will show up on test but it is still illegal to use it for that purpose! as in the FEI rules it is expressly forbidden to administer any product that will alter the temperament or way of going of a horse. Some companies have changed their wording others havent but none are strictly competition legal!!!
Of course its not simple! However any body administering a calmer tube at a competition cannot really say they are rectifying a feed issue can they!!! That should have been done at home ages ago through simple feeding management.Dont get me going on magnesium deficiency as in reality very few horses have a deficiency but the magnesium in calmers does have some effect on them but not because they were deficient in the first place but because they cannot mobilise it when stressed! In some of these horses the more magnesium you feed the more symptoms you get as the over supply in the animals reduces its ability to use it .It is very complicated. This is why some riders say that the calmer actually made the horse worse.
