Progesterone

Progesterone is a steroid hormone secreted by the corpus luteum of the ovaries, placenta and (in small quantities) the adrenal cortex and testes. It plays an important role in the reproductive system and pregnancy.

The main functions of progesterone:

  1. Preparing the endometrium (uterine lining) for implantation of a fertilized egg. Progesterone causes endometrial proliferation and increases vascularization to provide optimal conditions for embryo implantation.

  2. Maintaining pregnancy. During pregnancy, the placenta produces large amounts of progesterone, which prevents uterine contractions and subsequent miscarriages.

  3. Preventing the production of new eggs in the ovaries during pregnancy. Progesterone suppresses ovulation to prevent another pregnancy.

  4. Regulation of the menstrual cycle. Changing progesterone levels controls the duration of the cycle phases.

Thus, progesterone is extremely important for reproductive function in women. See also menstrual cycle, gestagen.



Progesterone is one of the most important hormones responsible for women's reproductive health. This steroid hormone is secreted by the corpus luteum of the ovaries, placenta and, in small quantities, by the adrenal cortex and testes. It plays an important role in preparing the female body for pregnancy and maintaining it throughout the entire period.

One of the main functions of progesterone is to prepare the endometrium for embryo implantation. In the case of fertilization of a mature egg, progesterone creates the necessary conditions in the uterus for the normal course of pregnancy. It helps maintain the thickness of the endometrium, provides a sufficient number of blood vessels and prepares the breasts for lactation.

Progesterone also interferes with the production of new eggs in the ovaries, which is one of the reasons why the chance of conception decreases during pregnancy. This hormone also improves mood and reduces depression in women.

The menstrual cycle is closely related to the level of progesterone in a woman’s body. In the first phase of the cycle, ovulation occurs under the influence of estrogen. Then, after ovulation, progesterone levels begin to rise and reach their peak during the luteal phase of the cycle. If pregnancy does not occur, progesterone levels drop, causing a new cycle to begin.

Progestins, including progesterone, are used to treat certain gynecological diseases such as menstrual disorders, endometriosis and infertility. They can also be used in contraception.

Although progesterone is a naturally occurring hormone, too little or too much of it can lead to serious health problems. For example, low progesterone levels can lead to menstrual irregularities, infertility, and also increase the risk of miscarriage in early pregnancy. High progesterone levels can lead to drowsiness, fatigue, and digestive problems.

In conclusion, progesterone is an important hormone that plays a key role in pregnancy and women's reproductive health. It helps prepare the body for pregnancy, supports it throughout the entire period and improves mood. However, a lack or excess of progesterone can lead to serious illnesses, so it is important to monitor its levels and consult a doctor if necessary.



Progesterone is a special hormone that is responsible for the normal process of pregnancy. This hormone is secreted by the corpus luteum of the ovaries, as well as the placenta and adrenal cortex. It can also be produced in small quantities by the testicles in men.

Progesterone plays an important role in the process of preparing the endometrium to accept a fertilized egg for fetal development. In this process, it reduces the sensitivity of the uterus to other tissue. When conception occurs, progesterone provides the necessary atmosphere for the growth and development of the embryo throughout pregnancy, and also suppresses the release of new eggs into