ProHormones are a chemical compound that does
not have a significant hormonal effect in
itself, but which is a precursor to an actual
active hormone. Prohormones are taken in order
to boost the body's available hormone supply.
Enzymes convert these precursors to full,
active hormones during metabolism. The most
commonly used prohormones are anabolic
precursors of testosterone. Their effects are
similar to synthetic steroids and they are
taken to increase muscle mass and
strength.