Latest Challenge hypothesis Stories
Reasons for low testosterone and basic tips on how to increase testosterone levels naturally are revealed.
A new study, led by the University of Missouri, has found that testosterone levels during group competition vary depending on the relationships of the competitors. These hormones levels may be related to the formation of alliance in warfare.
In male songbirds of the temperate zone, the concentration of sex hormones is rising in spring, which leads to an increase in song activity during the breeding season.