Prolific Equine Stress & Performance Support is an organic nutrient-dense spirulina tablet with a vast array of benefits for horses, including nutritional support for muscle growth, stress, immunity and performance. Spirulina is a blue/green algae superfood known as one of the most concentrated natural sources of nutrition. It contains all essential amino acids, including nine that support lean muscle growth. It is also rich in chlorophyll, beta-carotene and other natural phytochemicals and is the only green food rich in the essential gamma-linolenic fatty acid.