Farnam Horse Health B-Kalm Paste is a calming supplement for horses that provides the essential amino acid L-Tryptophan to mildly suppress central nervous system responses It helps maintain calmness and relaxation without side effects and is ideal for competition, travel, racing, or handling difficult horses The paste is NASC certified, made of pure L-Tryptophan, and is considered legal under FEI rules, though users should always check their organization’s prohibited substances list