AGENT FOR INCREASING TESTOSTERONE LEVEL

摘要

Disclosed is a substance which is a safe food ingredient that has been used in a food for many years and can increase the testosterone level. The substance comprises vitamin K as an active ingredient. The vitamin is preferably menaquinone-4 and/or menaquinone-7. The substance is useful as a pharmaceutical agent, a supplement, a health food or a functional food for the prevention, amelioration and/or treatment of a condition or disease induced by the decreased testosterone level.