These natural herbs may help defend against hypothyroidism (underactive thyroid). The thyroid helps regulate your pet's metabolism to convert food into energy and is crucial to overall health. Cardamom seed contains antioxidants, which can help combat oxidative stress and reduce the risk of thyroid damage caused by free radicals. Mustard seeds contain antioxidants, such as selenium and magnesium, which help protect cells from oxidative stress and damage, and oxidative stress can negatively impact thyroid health. Lastly, Kelp is rich in iodine, which is necessary for producing thyroid hormones. We packaged it in a recyclable jar with a 1/4 teaspoon for easy serving.