The supplement comes from dried or raw testicular tissue, usually from bulls. Glandular therapy holds that eating an organ delivers nutrients that help that same organ in the body.
Advocates believe the nutrients, peptides, and proteins in testicle tissue promote male endocrine and reproductive health. This includes libido, vitality, and hormone balance. Some people take it as part of a broader male health or anti-aging routine.
People usually take it as a capsule or tablet with food, cycling on and off for several weeks. Scientific evidence is scant. Traditional use rests on anecdotal reports, not rigorous studies.