Many steels add to the iron-steel mix other metals that give the entire substance desirable properties such as strength, heat resistance, or flexibility. Steel is considered a mixture rather than a compound because the iron does not chemically bond with the carbon and other components.
Some of estrogen's effects include: 1  Increasing serotonin, and the number of serotonin receptors in the brain. 2  Modifying the production and the effects of endorphins, the feel-good chemicals in the brain. 3  Protecting nerves from damage, and possibly stimulating nerve growth.
What effect does menopause have on the skin? On average menopause occurs as women reach early to mid-50 years. Leading into this time changes in hormone production occur, most notably a decline in oestrogen levels (hypo-oestrogenism). It has been found that oestrogen affects every organ system of the body including the skin. It appears that oestrogen receptors are most abundant around the genital area, face and lower limbs.