Synthroid, also known as Levothyroxine, is a synthetic hormone used to treat hypothyroidism. Hypothyroidism occurs when your thyroid fails to produce enough thyroid-stimulating hormone, or TSH. This can cause weight gain and susceptibility to illness as your immune system becomes suppressed.

The thyroid is a gland that produces hormones important for energy levels, mood and metabolism. If your thyroid produces too few hormones, you have a condition known as hypothyroidism. Depending on the severity of your condition, your doctor may prescribe synthetic thyroid medications.

There are scores of health issues related to cow's milk -- the growth hormones and pesticides used to produce milk. In fact, according to Dr. Joseph Mercola, cow's milk is the number one allergic food in the United States.

The Natural Hormones website suggests that progesterone levels may fluctuate during the course of a woman’s normal menstrual cycle, and low progesterone levels are common during the follicular phase of the menstrual cycle. Women with low progesterone levels may suffer from estrogen dominance.

Steroids are a class of lipid hormones synthesized from cholesterol. They regulate metabolism, immune response, reproduction and other essential biological processes, the 1999 textbook “Biochemistry” notes.

Progesterone is a female hormone that your doctor may prescribe to help you if you have passed through menopause, MedlinePlus states. Along with another female hormone called estrogen, progesterone can help as a hormone replacement therapy. It works to decrease the potential of cancer developing in your uterus.

Testosterone supplements are products that increase the male sex hormone testosterone, which governs muscle mass, aggression and secondary sexual characteristics in men. Prohormones, testosterone boosters and estrogen blockers are all different types of testosterone supplements.

The thyroid is a gland positioned at the bottom of the neck and shaped like a butterfly. Its main function is to control metabolism, determining how much energy the body's cells use and controlling body temperature, heart rate and the production of proteins.

Your pituitary gland is responsible for relaying messages from your hypothalamus to your endocrine glands and also secreting hormones that control growth and development.

Hair is a form of dead protein that pushes through the layer of skin on the scalp. Through a normal life cycle, hair goes through a growing phase, a resting phase and a shedding phase. As the hair is shedding, the growing phase begins all over again.

Honey is a sugar-rich syrup that is purported to be a beneficial sweetener because it contains natural sugar, rather than artificial sweeteners such as high-fructose corn syrup. While honey can be beneficial in some ways, one nutritional use for which honey is unlikely to be beneficial is increasing testosterone.

Chasteberry, also referred to as vitex, chaste tree and agnus castus, has a long history of use for addressing a variety of conditions triggered by female hormonal imbalances. Examples include breast tenderness, premenstrual syndrome and infertility.