Spirulina platensis is a blue-green algae that is rich in protein, fatty acids, vitamins, and minerals. It is used to support healthy skin, metabolic health, lung function and the immune system in horses. It has anti-histamine, anti-inflammatory and anti-oxidant effects that could benefit horses with frequent illness or allergies. It can be used as a nutritional support for horses in stressful situations like competition and high-intensity exercise.