Tyro Plus contains iodine, which contributes to the normal production of thyroid hormones, along with amino acids tyrosine, glutamine and glycine, other minerals, vitamins and sarsaparilla root associated with endocrine nutrition.DirectionsOne capsule, three times a day with food.IngredientsL-Tyrosine, L-Glutamine, L-Glycine, Smilax Sarsaparilla Root Extract 4:1, Zinc Citrate, Pyridoxine Hydrochloride, Thiamine Mononitrate, Riboflavin, Nicotinamide, Manganese Gluconate, Copper Gluconate, Potassium Iodide, Sodium Selenite, Cholecalciferol, Cellulose, Magnesium Stearate, Corn Starch, Capsule: Hydroxypropylmethyl CelluloseAllergen InformationVegetarian,Hypoallergenic,AdditivesSweeteners and AdditivesCellulose, Magnesium Stearate, Corn Starch