It doesn't seem like its enough!


It is typical for the average man's testicles to produce about seven milligrams of testosterone a day,

Of the 2-4% of testosterone not bound to one of these proteins is known as free-testosterone and it is this testosterone that has effect on muscle-building and all the other physiological benefits we look for from increased testosterone.


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Same info, different source:

Most men produce 6-8 mg of the male hormone testosterone (an androgen) per day, compared to most women who produce 0.5 mg daily. Female hormones, estrogens, are also present in both sexes, but in larger amounts for women.

http://health.howstuffworks.com/sexual-health/sexuality/estrogen-and-testosterone-hormones-dictionary.htm