Follicular cells are specialized cells found in the thyroid gland. They play a crucial role in producing thyroid hormones, specifically thyroxine (T4) and triiodothyronine (T3). These hormones are essential for regulating metabolism, growth, and development in the body. In addition to hormone production, follicular cells also help in the uptake of iodine, which is vital for synthesizing thyroid hormones. The health and function of these cells are important for maintaining overall endocrine balance, and any dysfunction can lead to conditions such as hypothyroidism or hyperthyroidism.