Here are some potential benefits of feeding garlic to horses:
A common way of feeding horses garlic is granules or flakes. These supplements are usually processed through freeze-dried, air-dried, or cold-pressed dehydration. Less allicin is destroyed through these processing methods than in conventional heat-dried powdered garlic, so they may be more beneficial for your horse.
Garlic still loses potency as it sits on the shelf, so if you buy granules or flakes, ensure the product comes in a container with a tight-fitting lid to help retain potency.