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.
Neurotransmitter fluctuations can have an effect on thinking, digestion, sleeping, eating, pain levels, and can lead to onset of disease and mental health disorders. Symptoms of low estrogen levels may include: Fatigue; Hot flashes; Night sweats; Memory lapses; Difficult concentrating; Joint pain; Vaginal dryness