The thyroid gland synthesizes and secretes hormones that are responsible for regulating energy production, metabolic rate and body heat production, among other things. Thus, people with low thyroid hormone levels often experience fatigue, weight gain, cold intolerance and a variety of other symptoms.

Progesterone plays an important role in the health of women. This hormone regulates menstruation, supports pregnancy and alters fertility. Progesterone also affects men. It changes testosterone level and impacts sperm count.

Adrenaline, or epinephrine, and cortisol, or hydrocortisone, are stress hormones secreted from the adrenal glands, which sit above the kidneys. Though both chemicals are stress hormones, adrenaline and cortisol play different biochemical roles. Adrenaline primarily binds to receptors on the heart and heart vessels.

The thyroid is a butterfly-shaped gland in your neck. Although small in size, it plays a significant role in your wellness by producing hormones that help regulate your metabolism, energy level, mood and body temperature.

The hormone estrogen is largely responsible for the differences between boys and girls. Children have low levels of this hormone, but during puberty, the levels increase and bodies change rapidly.

Hypothyroidism is a condition where the thyroid gland does not produce enough thyroid hormones. According to the Mayo Clinic, it is the most common thyroid disorder. Symptoms of hypothyroidism include weight gain, fatigue and intolerance to cold and dry skin.

Hypothyroidism is a condition where your production of thyroid hormone decreases below what your body requires. Among many side effects, your metabolism slows down, which often leads to weight gain. If you are living with hypothyroidism, you should see a doctor or an endocrinologist.

The thyroid gland is a small gland located in the front of your windpipe. It releases hormones that control your metabolism, which is your body's ability to burn calories. T3, or triiodothyronine, is one type of thyroid hormone released from the thyroid gland.

For transgendered individuals, the start of hormone therapy can be exciting and anxiety-provoking. Because a trans man's genetic gender does not match his brain gender, testosterone therapy is administered to help masculinize his body.

Porcine thyroid glandular supplements are over-the-counter nutritional supplements that are made from dried thyroid glands of pigs. People take these as a way to boost thyroid-gland function.

Reproductive health in both men and women require maintaining balanced levels of hormones. Follicle-stimulating hormone (FSH) is made in the pituitary gland in the brain. In women this hormone helps to regulate ovulation and the menstrual cycle.

Cortisol is a hormone released from the adrenal gland during stress. It’s involved in immune function, glucose metabolism, insulin release and inflammation. Chronically high cortisol levels can impair your cognitive performance, decrease muscle tissue, suppress thyroid function and increase visceral fat.