Hormones are chemical substances that help to regulate processes in the body.Hormones are secreted by glands and travel to their target organs in the bloodstream. Several hormones are involved in the female menstrual cycle.Hormones can be used to control human fertility and have advantages and disadvantages.
Hormones are chemical messengers that travel throughout the body coordinating complex processes like growth, metabolism, and fertility. They can influence the function of the immune system, and even alter behavior. Before birth, they guide development of the brain and reproductive system.
Some of the approved drugs are synthetic versions of the natural hormones, such as trenbolone acetate and zeranol. Just like the natural hormone implants, before FDA approved these drugs, FDA required information and/or toxicological testing in laboratory animals to determine safe levels in the animal products that we eat (edible tissues). Furthermore, FDA required that the manufacturers demonstrate that the amount of hormone left in each edible tissue after treatment is below the appropriate safe level. As described above, a safe level is a level which would be expected to have no harmful effect in humans.
The three main types of female sex hormones are:
- Estrogen: A female sex hormone produced by the ovaries, the adrenal gland, and (in small quantities) by body fat. Estrogen helps to retain calcium in bones, regulates the balance of high density lipoprotein (HDL) and low density lipoprotein (LDL) cholesterol in the bloodstream, and aids the maintenance of blood-sugar levels, memory functions, and emotional balance, just to mention a few.
- Progesterone: A female sex hormone produced in largest amounts during and after ovulation that prepares the uterus for the implantation of a fertilized egg. It also helps reduce body fat, aids in relaxation and reduction of anxiety, and promotes hair growth.
- Testosterone: The principal male sex hormone, testosterone is also produced in smaller amounts in women's bodies mostly by the ovaries and adrenal glands. It plays an important role in the health and well-being. Testosterone affects libido, mood, energy, and body fat and helps to protect against osteoporosis.