Testosterone USP is natural bio-identical testosterone that has been approved by the United States Pharmacopoeia and is available as a bulk chemical. Upon a prescription order, compounding pharmacists can use Testosterone USP to prepare numerous dosage forms.

The only absolute contraindications to androgen replacement therapy are the presence of prostate or breast cancer. "Although it is known that the clinical course of prostate cancer is accelerated by testosterone, its incidence is not increased by [testosterone] administration... There is even no clear evidence that testosterone replacement accelerates the development of BPH."

Natural Testosterone Replacement is central to the treatment of all facets of andropause. The term "testosterone" is often used generically when referring to numerous synthetic derivatives, as well as natural bio-identical testosterone. Confusion is responsible for conflicting data in the medical literature about the benefits and risks of testosterone therapy. Studies must be reviewed carefully to determine the form of testosterone that was used. Natural testosterone must not be confused with synthetic derivatives or "anabolic steroids," which when used by athletes and body builders have caused disastrous effects. For example, administration of synthetic non-aromatizable androgens, like stanozolol or methyltestosterone, causes profound decreases in HDL-C ("good cholesterol") and significant increases in LDL-C ("bad cholesterol"). Yet, hormone replacement with aromatizable androgens, such as testosterone, results in lower total cholesterol and LDL cholesterol levels while having little to no impact on serum HDL cholesterol levels. Proper monitoring of laboratory values and clinical response are essential when prescribing testosterone replacement therapy.