HorseFlex Oregano RefillHorseFlex Oregano is a feed supplement for horses that supports digestion and respiratory health. It also contributes positively to your horses overall vitality. Oregano as a supplement for horses Oregano, also known as Origanum vulgare or wild marjoram, belongs to the mint family. This aromatic herb, well known from Italian and Greek cuisine, also has many health benefits for horses. Like other plants in the same family, such as thyme and rosemary,