No!Under the current FEI regulations, Amino Acids are permitted and Equinety Horse XL is a patented, proprietary, 100% All Natural Amino Acid stack!
(The below insert is taken directly from the FEI.org website)
Permitted Substances of interest to equine feed industry
The FEI Rules and Regulations permit the use of certain substances such as:
B-vitamins, amino acids and electrolytes. These have always been allowed orally and in many cases this is still the preferred route of administration. However in some circumstances a veterinarian may prefer to administer them intravenously or intramuscularly.
See the post here: http://www.fei.org/fei/horse-health-and-welfare/doping-controlled-medication