Kohnkes Own Mag-E is a high quality magnesium, vitamin E and vitamin B1 (thiamine) supplement for working, travelling and competitive horses. Mag-E is designed to correct the low levels of magnesium, vitamin E and B1 often found in grain based, low roughage diets to help support healthy muscle and nerve function. This veterinarian formulated supplement has a pleasant vanilla milk flavour and also contains debittered yeast to help promote healthy digestion.