Testosterone is the primary male sex hormone, but is also found in women, though in much smaller amounts. An average man, for instance, may contain as many as 1,000 nanograms of testosterone in a deciliter of blood plasma, while a typical female does not usually exhibit more than 60 nanograms of the hormone in the same amount of plasma. The location of testosterone production is also different between the sexes, males producing the substance primarily in the testes and females manufacturing it in the ovaries and adrenal glands. Testosterone can be synthesized in the laboratory as well, in which case it generally occurs as a white crystalline powder that is virtually insoluble in water.