"Synthroid is a naturally occurring hormone important for normal energy and metabolism. Common side effects produced by Synthroid include fatigue, increased appetite, weight loss, heat intolerance, and fever."
"Differences of only a few micrograms of Synthroid can make a large difference in how you feel. The thyroid gland. Synthroid is to be used only by the patient for whom it is prescribed. Synthroid is a naturally occurring hormone produced by the thyroid glands. A variety of reasons, when the body may not produce enough thyroid hormone."
"Levothyroxine is a naturally occurring hormone produced by the thyroid glands also known as goiter. Synthroid is the most commonly prescribed of all the thyroid supplements."