Thyroid powder capsules are an effective way to naturally support your thyroid gland function. They contain ingredients that have been shown to be beneficial for supporting healthy thyroid activity. These include organic ashwagandha root, which has been used traditionally as a natural remedy for hypothyroidism. Other herbs included in these capsules include gotu kola herb, bladderwrack, kelp, bioperine, iodine, copper, zinc, vitamin b5, calcium pantothenate, and potassium iodide. 90 Veggie Caps.