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Synthroid, also known by its generic name levothyroxine, is a medication that serves as a synthetic replacement for the thyroid hormone. The thyroid gland produces hormones that play a crucial role in regulating metabolism, energy levels, and overall bodily functions. When this gland is underactive, a condition known as hypothyroidism arises, leading to various health issues. Synthroid helps to restore normal levels of thyroid hormone in the body, thus alleviating symptoms associated with low hormone production, such as fatigue, weight gain, and depression. This makes it essential for individuals who need to manage their thyroid hormone levels effectively.

The other options refer to hormones that play different roles in the human body. Insulin is primarily associated with glucose metabolism; estrogen is involved in reproductive health; and cortisol is a steroid hormone related to stress response and metabolism. Each of these hormones serves a unique purpose, distinct from that of the thyroid hormone, further emphasizing why Synthroid is specifically designated for thyroid hormone replacement.