A viral Twitter post from April 9 claims testosterone levels have dropped by almost 50% over the past 20 years. "Here's a cheery Friday fact," reads the post. "An average 22 year-old (sic) male today ...

Testosterone is arguably one of the most essential hormones for supporting men’s health. It plays a role in supporting intimate, bone, muscle, and mental health. Testosterone levels that are higher or ...

Starting around age 40, many men notice the first physical changes that may be related to their hormone levels: Energy wanes more quickly, sleep is less restful, and waistlines often expand. These are ...

仕事に、人生に効く一冊。 Inc.：男性も女性も人々はみな、子宮の中、思春期、成人期などそれぞれの成長の過程でテストステロン（男性ホルモンの一種）の影響を受けています。科学者の多くはテストステロンのレベルが脳の発達に影響を及ぼす、という ...