Additionally, the iodine is problematic and can cause further thyroid damage. (thyroidpharmacist.com)
However, studies are showing that natural antioxidant therapy — such as with vitamin C — can reverse thyroid damage and even help those who don't see improvement with their prescription medication. (nutritionmayhem.com)
They won't cause any type of thyroid damage but they can interfere with medications used to treat hypothyroid conditions. (verywellhealth.com)