Tryptophan by ESC Laboratoire is an amino acid, that is to say a constituent of proteins. Among the 22 existing amino acids, tryptophan is one of the nine so-called “essential” ones: it cannot be produced by the body and must be supplied in the diet. This unique amino acid is a precursor of a neurotransmitter, serotonin, that is to say it participates in its production. This brings serenity (fight against anxiety) to stressed horses. This care product also allows the synthesis of vitamin B3 which is involved in energy production. This amino acid is generally found in plants: animals do not have the capacity to synthesize it. Plant microorganisms are therefore the only ones capable of synthesizing this amino acid. The original formula is a concentrate of tryptophan (10g/day at full dose!) enriched with magnesium and lithothamne, a small marine algae beneficial in cases of gastric acidity.