Estrogen

Estrogens are a family of related molecules that stimulate the development and maintenance of female characteristics and sexual reproduction.

What is Estrogen?

Estrogens (also called Oestrogens) are steroid compounds that are important for development and functioning of females of the species. They are named so because they play an important role in the estrous cycle. Their name comes from estrus/oistros (period of fertility for female mammals) + gen/gonos = to generate.

Estrogen in Cosmetics

Estrogen Types

The Role of Estrogen in Men’s Health

Estrogen in Medicine

Estrogen Function

Estradiol and Estrogen Levels

Latest Estrogen News and Research

Gut bacteria may help explain why endometriosis pain varies

A study of 50 women with surgically confirmed endometriosis found that differences in gut bacterial composition were associated with menstrual pain, urinary symptoms, and infertility.

9 Oct 2026

Younger postmenopausal women may not get enough calcium

A small Italian study examined whether women facing heightened bone-loss risks are getting enough calcium from their diets, with particular attention to breast cancer patients receiving endocrine therapy.

6 Oct 2026

Phase III trial tests MRD-guided treatment for patients with ER-positive/HER2-negative breast cancer

Alliance Foundation Trials, LLC (AFT), a national leader in conducting innovative, practice-changing cancer clinical trials, and Natera, Inc., a global leader in cell-free DNA and precision medicine, today announced the launch of AFT-70 NAVIGATE, a randomized phase III trial evaluating a novel molecular residual disease (MRD)-guided treatment strategy for patients with intermediate and high-risk ER-positive/HER2-negative early breast cancer.

5 Oct 2026

Sex chromosomes influence immunity, cancer, aging and disease risk

A new review published in Science brings together growing evidence that the X and Y chromosomes do much more than determining biological sex. They also shape how cells function, age and respond to disease.

1 Oct 2026

Targeting specific nuclear receptor could help preserve aging muscle function

Scientists in the Gerhart-Hines Group pinpoint a molecular cause of muscle aging, and a possible fix. By investigating how muscles adapt to age and disease-related decline, the scientists discovered the involvement of a druggable nuclear receptor, ERRγ, that could be targeted to preserve muscle function.

29 Sep 2026

Long-term endocrine therapy adherence remains low after breast cancer surgery

Many patients with early-stage breast cancer do not consistently maintain the long-term hormone therapy prescribed after lumpectomy, a large U.S. insurance claims analysis indicates.

27 Sep 2026

EGFR co-targeting and nanotechnology offer new triple-negative breast cancer therapies

Triple-negative breast cancer (TNBC) remains one of the most challenging forms of breast cancer to treat because it lacks the estrogen, progesterone and HER2 receptors that enable targeted treatment in other breast cancer subtypes.

24 Sep 2026

New trial aims to evaluate chemotherapy benefit for ER+/HER2- breast cancer patients

The addition of CDK4/6 inhibitors to endocrine therapy has changed the standard of care for patients with high-risk early-stage estrogen receptor-positive, HER2-negative (ER+/HER2-) breast cancer by reducing the risk of recurrence.

24 Sep 2026

Mifepristone offers effective emergency contraception with fewer side effects

Emergency contraception containing mifepristone prevents more pregnancies with fewer side effects than some other common emergency contraceptive pills such as levonorgestrel, according to a new Cochrane review involving 87 trials.

20 Sep 2026

Why might a higher BMI at 20 be linked to lower breast cancer risk later in life?

A large UK cohort study found that higher BMI at age 20 was associated with lower postmenopausal breast cancer risk, while higher BMI in later adulthood was linked to increased risk. Lower VAS percentage mammographic density appeared to explain part of the early-adulthood association, while fibroglandular volume showed a different relationship with life-course adiposity.

20 Sep 2026

High estrogen alters brain circuit causing temporary memory impairment during pregnancy

Many women usually say the same thing during pregnancy: they walk into a room and forget why, misplace their keys or struggle to follow a conversation.

17 Sep 2026

Shatavari may affect more than hormones, and the gut could help explain why

A review in Nutrients examined how bioactive compounds in Asparagus racemosus (Shatavari) may influence cognitive health through the microbiota-gut-brain axis, estrogen-related signaling, neuroinflammation, oxidative stress, and neurotransmitter regulation. Evidence from computational, cellular, animal, and limited human studies suggests several plausible biological pathways, but key questions remain about bioavailability, brain exposure, dosing, and clinical efficacy.

16 Sep 2026

Menopause may not drive rising pulse pressure and midlife aortic stiffness in women

Contradicting conventional wisdom, menopause may not be the driving force behind an increase in aortic stiffness in women after midlife, according to new, independent research published today in Hypertension, a peer-reviewed scientific journal published by the American Heart Association journal.

15 Sep 2026

Women use creatine differently from men, survey reveals

A cross-sectional survey of 2,094 current or recent creatine users found that women were more concentrated in shorter-duration use groups than men and reported different supplementation goals, information sources, and knowledge patterns. Women were less likely to cite athletic performance and more likely to cite healthy aging as a goal, while researchers cautioned that the survey design cannot explain why these differences exist.

10 Sep 2026

Hormone therapy during menopause transition associated with lower heart disease risk

A study led by Virginia Commonwealth University and the University of Pittsburgh provides pivotal insights into one of the most debated questions in women's health: how does hormone therapy for menopause symptoms affect cardiovascular disease risk when used in peri- or early postmenopause?

8 Sep 2026

Ovulation drives women to use conspicuous luxury to attract men

Hormonal fluctuations associated with fertility are associated with a greater tendency for women to use conspicuous luxury symbols, potentially to be noticed by men, according to a study published September 2, 2026, in the open access journal PLOS One by Aekyoung Kim of Jeonbuk National University of the Republic of Korea, and colleagues.

4 Sep 2026

Estrogen hormone combination may help relieve menopausal brain fog

Many women going through menopause report struggling with memory lapses, trouble concentrating and slower thinking, a set of symptoms often described as "brain fog."

1 Sep 2026

HRT linked to lower dementia risk, but timing and menopause type matter

In a UK Biobank study of 183,450 postmenopausal women followed for an average of 13.3 years, hormone replacement therapy use was associated with a modestly lower risk of dementia, with stronger associations in women who had surgical menopause or shorter natural estrogen exposure. The relationship also varied by age at HRT initiation, while the observational design means the findings cannot establish that HRT prevents dementia.

27 Aug 2026

Study challenges traditional breast cancer classification methods

Breast cancer is often classified as either estrogen receptor-positive (hormone-sensitive) or not. However, a new study from Karolinska Institutet suggests that this simplified classification may overlook important biological differences between patients that could affect treatment decisions.

27 Aug 2026

Higher BPA exposure tracked with higher estrogen and progesterone in women

Researchers found that higher urinary concentrations of BPA and several phthalate metabolites were associated with higher serum estrogen and progesterone levels in 90 premenopausal women from Iran. The cross-sectional study also identified positive associations for combined chemical exposures, although the authors cautioned that the mixture findings are exploratory and cannot establish causality.

24 Aug 2026