P202：Do not handle until all safety precautions have been read and understood.
P264：Wash hands thoroughly after handling.
P264：Wash skin thouroughly after handling.
P270：Do not eat, drink or smoke when using this product.
P273：Avoid release to the environment.
P301+P312：IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.
P308+P313：IF exposed or concerned: Get medical advice/attention.
Description
Testosterone is the prototypic and predominant circulating androgenic steroid. It plays a major role in the growth and function of many reproductive and non-reproductive tissues and organs including muscle, liver, and brain, directing the development of the male phenotype during embryogenesis and at puberty. Testosterone is synthesized from 17α-hydroxy progesterone by the enzymes 17,20-lyase and 17β-hydroxysteroid dehydrogenase in the gonads of both males and females. In many target cells it is reduced to 5α-dihydro testosterone, which mediates many of the biological actions of testosterone. It is then further metabolized to 17β-estradiol by aromatase. Serum levels of testosterone range from 0.5 ng/ml in women to approximately 6-10 ng/ml in men, declining with age.
