Female birth control pills are intended to prevent contraception in women. They are most often a combination of synthetic forms of both types of female hormones, estrogen and progesterone 1. Although rarely used, female hormones may be taken by men for a number of medical conditions such as prostate enlargement, testicular cancer and aromatase deficience. Because oral contraceptives are not intended for use in men, side effects have not been well studied or documented; however, they may cause a number of adverse effects in men similar to those seen with the use of other female hormones 1. Testosterone is responsible for the formation and development of male sex characteristics. When testosterone is opposed by high levels of female hormones present in birth control pills, testosterone will be less effective.
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Human growth hormone (HGH): Does it slow aging? - Mayo Clinic
Scientists call environmental substances that can potentially alter our bodies' hormone system "endocrine disruptors. Yet, under some conditions, they stay in the environment and contaminate the food supply. Such contamination may affect the basic processes of our bodies. Environmental hormones can have a significant effect on our maturation. Manufacturers have used this chemical in plastic products like water bottles and food trays since the s.
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Can human growth hormones really benefit aging, like the elusive fountain of youth? In , the Spanish explorer Juan Ponce de Leon arrived in Florida to search for the fountain of youth. If he got any benefit from his quest, it was due to the exercise involved in the search.
The hormonal theory of sexuality holds that, just as exposure to certain hormones plays a role in fetal sex differentiation , such exposure also influences the sexual orientation that emerges later in the adult. The hormonal theory of sexuality and gender identity holds that, just as exposure to certain hormones plays a role in fetal sex differentiation, such exposure also influences the sexual orientation and or gender identity that emerges later in the adult. Differences in brain structure that come about from chemical messengers and genes interacting on developing brain cells are believed to be the basis of sex differences in countless behaviors, including sexual orientation. As seen in young children as well as in vervet and rhesus monkeys, sexually differentiated behavior in toy preference is differing in males versus females, where females prefer dolls and males prefer toy balls and cars; these preferences can be seen as early as 3—8 months in humans. An endocrinology study by Garcia-Falgueras and Swaab postulated that "In humans, the main mechanism responsible of [ sic ] sexual identity and orientation involves a direct effect of testosterone on the developing brain.