Pharmaceutical compositions based on Ademethionine; neutraceutical preparations for veterinary and human use; vitamin supplements; probiotic supplements; nutritional supplements for medical use; dietetic supplements for medical use; nutritional supplements for medical use; mineral supplements for medical use; feed supplements for veterinary use; dietary supplemental drinks; food supplements for non-medical purposes; nutraceuticals for use as a dietary supplement; vitamin preparations in the nature of food supplements; dietetic substances for medical use; dietetic food and preparations for medical use; dietetic substances adapted for veterinary use