95% of the serotonin in the human body is located in the gut. Serotonin deficiency in men causes impulsive, violent behavior and alcohol abuse.
Levels of a stress hormone called cortisol — the same ancient chemical that instructs men to fight or flight — tend to spike about 4 to 6 weeks after men learn that they are going to be fathers.
Melatonin levels secreted in breast milk vary depending on the time of day, helping a baby know when to sleep/wake up and thus regulate its sleep cycle. Babies who are fed formula have a harder time regulating their sleep cycle and are more prone to colic.
Ghrelin, an appetite-stimulating hormone - is increased in both anorexics and obese people.
Higher levels of estradiol are linked to increased attractiveness, femininity and fertility in women.
The word "Adrenalin" - which would become genericized as "adrenaline" - is actually a trademarked name for the hormone "epinephrine."
There is a hormone called "Relaxin" that Relaxes pelvic ligaments to help with pregnancy.
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Melatonin has undergone clinical trials as a female contraceptive. At high doses, it effectively prevented pregnancy, with drowsiness as the only documented side effect.
The hormone Oxytocin, known as the 'Love Hormone', can promote prejudice, xenophobia, and intergroup violence.
10Human Growth Hormone
Human Growth Hormone (HGH) extracted from cadavers causes Creutzfeldt-Jakob disease, a rapidly degenerative neurological disorder, which is why HGH is now created using recombinant DNA.