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L-tryptophan is an essential amino acid precursor to serotonin, a critical neurotransmitter for stabilizing mood, relieving panic and anxiety, and maintaining a normal sleep-wake pattern. With tryptophan, a horse makes niacin, a B vitamin, which is important for normal digestion, skin, nerves, and serotonin. Tryptophan in the form of L-tryptophan is considered 100% digestible and available to the animal.