All Natural Herbs for Stallions & Geldings Hormones A hormonal imbalance in your horse or equine needs to be regulated. For regulating hormones for stallions and geldings, there are many methods you can try, but we recommend taking a more natural approach. If your horse is moody, you may be able to help their hormone balance by giving them a diet more closely to what they would have naturally through supplementation. Many professional riders and veterinarians recommend Silver Lining Herbs for hormone issues with their horses. Our herbal supplements carry the NASC Quality Seal of approval because of our high standards and commitment to equine health.