Testosterone suspension is an injectable preparation containing testosterone (no ester) in a water base. Therefore, there is no ester to be accounted for in the weight. This means 100 mg of testosterone suspension contains 100 mg of the steroid. Testosterone suspension acts quickly and effectively in the body.

Since Testosterone Suspension is not highly water soluble, the steroid will noticeably separate from the solution when the vial is left to sit. Although it may contain testosterone without the benefit of an ester, and contrary to popular belief, the microcrystal design of this injectable will sustain an elevated testosterone release for 2-3 days. Clearly the suspension we see today is not the basic water plus testosterone design used in the 1940's. And since the drug will not leave circulation in a matter of hours, it is obviously useful.

The key role of Testosterone include:

- promoting health and well-being through enhanced libido,
- promoting energy,
- promoting immunity,
- preventing osteoporosis (loss of bone density)
- preventing possible protection against heart disease.

Testosterone is also responsible for normal growth and development of male sex organs and maintenance of secondary sex characteristics. Secondary sex characteristics are specific traits that separate the two sexes, but are not directly part of the reproductive system, for example: chest and facial hair and a distinguished jaw line.