Does natural progesterone prevent breast cancer?

No. There is no evidence Progesterone of any type prevents breast cancer, "natural" Progesterone or not. If a woman has menses that only occur a few times a year, six or four or fewer, however, Progesterone or progesterone-like compounds can very definitely prevent endometrial hyperplasia (which can lead to uterine cancer), and should be used regularly to oppose continuous estrogen stimulation.
No. Progesterone has been implicated as the "bad guy" in combined hormone replacement therapy when it comes to breast cancer. Women taking estrogen + progesterone, natural or not, were at higher risk of developing breast cancer. Also, their breast cancers tended to be more aggressive. Progesterone also seems to increase the aggressiveness of other cancers. Natural Progesterone is not any safer.

Related Questions

If I have too much estrogen, or not enough progesterone, does that make me more susceptible to breast cancer?

Breast cancer risk. Maybe: some breast cancers take up estrogen as a sort of growth hormone to encourage growth, so too much estrogen can speed growth of these cancers. There is a very small increase in breast cancer risk with estrogen only given postmenopausally for the symptoms. Relative increase in Progesterone only is associated with some breast disorders also but cancer risk is unclear. Read more...
High E2/Prog is NG. A high estrogen/progesterone ratio is a contributing factor to many medical and metabolic problems. Breast, ovarian, cervical cancer, pms. High e2/prog ratio will activate your parasympathetic nervous system and cause symptoms from excess vagal stimulation. Have your doctor check your e2 and prog during mid luteal phase of your menstrual cycle (day 18-21). Read more...

Should I take progesterone therapy for adenomyosis if I have a strong family history of stroke, breast cancer, and migraines with aura?

Very specific case. We can not really provide very specific guidance in unique cases such as this. A discussion with your obgyn is warranted discussing the various options, the risks and the benefits. Read more...
No. it realy depends on your plan to have children.if you no longer wishes to have children you should not take any risk with hormonal treatment,and choose surgical option.if you are planning to have more children,then you conservative,medical,hormonal treatment is the only option,in spite of your family history.discuss your options with your GYN. Read more...

Hormone replacement therapy. Estrogen alone increases risk of uterine cancer. Adding progesterone increases risk of breast cancer, but reduces risk of uterine cancer. What's the right balance?

Individual. Yes, estrogen alone does increase the risk of uterine cancer over time. And yes the whi showed that the combination of a certain synthetic estrogen and a certain synthetic progestin increased the risk of breast cancer. But most specialists do not use those older types of synthetic hormones and with newer medications the risks are lower and different. So a balance can be achieved. Read more...

Are the risks of getting cancer (especially breast cancer) higher, if I am already on hormone treatment (estrogen and progestogen) at age 17?

Family practice . Tell us why you are on hormone replacement therapy. Did they remove both ovaries or are they nonfunctional. Not higher risk for breast cancer. Slightly higher risk for blood clots. Don't smoke and exercise regularly. Read more...
No. Hormone use as birth control is not felt to increase the risk of developing breast cancer. It is the use of hormone replacement after menopause that is the concern. Read more...

Tamoxifen is given to breast cancer patients to suppress estrogen or both estrogen & progesterone?

Estrogen. Tamoxifen is given to individuals with specific breast cancers that are driven to grow by the presence of estrogen receptors. Tamoxifen interferes with the activity of estrogen in the breast, preventing cancer growth. The role of Progesterone receptors is unclear, though Progesterone receptors in breast cancer are generally associated with estrogen receptors, making tamoxifen an effective therapy. Read more...
Estrogen. Tamoxifen is an anti- estrogen in the breast, but can act like estrogen in other organs, notably the uterus. Women on tamoxifen, who have not had a hysterectomy, need to have a gyne keep a close eye on uterine health. Read more...
It's complicated. Tamoxifen is a selective estrogen receptor modulator which competes with estrogen to block this receptor on cancer (and other) cells. It does not suppress production of either estrogen or progesterone. Ironically, it is effective against breast cancer cells that harbor either the estrogen or Progesterone receptors (although, tumors that are estrogen rec. (-) and Progesterone rec.(+)are rare.). Read more...

Is flaxseed thought to prevent breast cancer?

No. Only moderate amounts of ground flaxseeds, up to two to three tablespoons per day at most, should be eaten. Flaxseed contains some phytoestrogens which likely don't encourage cancer or affect hormone positive breast cancers, but, as with many vitamins/minerals, it's nearly always best to get majority of nutrition from diet. Read more...