Taurine Calming Neurotransmitter Taurine is a crystalline, free-form amino acid. It is a soothing, inhibitory neurotransmitter and plays a major role in stabilizing the heartbeat and electrical activity of the nerves.Taurine is also necessary for the proper functioning of the "sodium/potassium ATP-ase pump", which regulates the ion balance between the cells and the extracellular fluid that surrounds them. This critically important "pump" actually uses 7% to 40% of the ATP energy our bodies produce.* Powder Option Available: 3.53 Suggested Use: 1/4 teaspoon per day, between meals or at bedtime. If you experience stomach irritation, take with meals. Allergies: Suitable for vegetarians. Contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor, or fragrance.