McTarnahans Nayzo Nasal Horse Ointment, 14-oz bottle; The McTarnahans Nayzo Nasal Ointment Horse Supplement is designed to support the relief of respiratory inflammation and congestion to keep your horse breathing easily. When applied to your horse’s nostrils or tongue up to three times daily, this ointment supports the temporary relief of minor respiratory issues. It includes eucalyptus and natural decongestants to support your horse’s respiratory health and comfort.