Estrogen is one of the sex hormones produced by the ovaries in females and the testes in males. They are known as female hormones because they are found in greater amounts in females than in males. It plays a dominant role in the female reproductive...

The estrogens are of a group of hormones synthesized by the reproductive organs and adrenal glands in females and, in lesser quantities, in males. All naturally occurring estrogens, including estradiol, estrone, and estriol, are C18 steroids secreted...

(oestrogens) A set of SEX HORMONES including ESTRADIOL and ESTRONE secreted from the ADRENAL GLAND and the OVARIES. See also: corticosteroids; endocrine glands; estrus; hormones; hormones—classification; menstrual cycle; organization effects of...

A HORMONE responsible for the development and maintenance of female characteristics. The US spelling is estrogen. See also:...

Estrogens (alternative spellings: oestrogens or œstrogens) are a group of steroid compounds, named for their importance in the estrous cycle, and functioning as the primary female sex hormone. Estrogens are used as part of some oral contraceptives, in...

Although estrogen is commonly referred to in the singular, there are many kinds. They are made by both men and women as well as by animals, but are made in much greater quantities in females than in males. The three major varieties of...

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Five years after a landmark study scared millions of women off hormones for menopause symptoms, new research suggests the pills may offer some heart benefits for certain younger women who start taking them in their 50s. Women who took estrogen suffered less hardening of the...

Estrogen may give women an edge in resisting heart disease that can be caused in part by air pollution, a new West Virginia University study found.Researchers determined that males and post-menopausal females are more likely to suffer damaged arteries linked to diesel exhaust than women...