Testosterone
The principal androgen, driving male sexual development and, in both sexes, muscle and bone mass, libido, mood, and red-blood-cell production.
Too little may be associated with
Low libido, fatigue, loss of muscle and bone density, and low mood.
Too much may be associated with
Acne, aggression, and (from anabolic misuse) testicular shrinkage and cardiovascular strain.
Informational only — not medical advice.
Organ systems
Stimuli that influence it
Behaviors
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