Herbs for Horses Breathe No Garlic is a clinically proven supplement used to support a healthy respiratory system. Reducing coughs, congestion and other respiratory problems, this product is one of the most effective on the market. This is the only clinically proven formula for COPD (chronic obstructive pulmonary disease)/heaves or small airway disease. This product strengthens the respiratory system of your equine friend and is a natural stable cough remedy. This formula now comes with Blue Green Algae which offers effectiveness against allergies. This powder does not come with garlic as some horses do not like the taste.