Sweetening the deal for potential winners seems to strengthen the effects of testosterone in competitions.
A new study finds that higher cortisol levels before, but not during, a speed-dating event makes men more popular with women. It depends on timing.
An over-the-counter hormone supplement called melatonin, typically made from animal pineal glands or synthesized in a laboratory, was tested on rats in the present study to see if it would be able to protect the intestines of rats treated with radiation.