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Individuals who are especially physically active and/or bathe often may not be good candidates, since the medication can be washed off and may take up to six hours to be fully absorbed.
Testosterone-containing creams and gels that are applied daily to the skin are also available, but absorption is inefficient (roughly 10%, varying between individuals) and these treatments tend to be more expensive.
It has been suggested that the prevalence of use among high-school students in the U. In order to be sufficiently active when given by mouth, testosterone derivatives are alkylated at the 17α position, e.g. This modification reduces the liver's ability to break down these compounds before they reach the systemic circulation.
Testosterone can be administered parenterally, but it has more irregular prolonged absorption time and greater activity in muscle in enanthate, undecanoate, or cypionate ester form.
Studies indicate that the anabolic properties of AAS are relatively similar despite the differences in pharmacokinetic principles such as first-pass metabolism.
However, the orally available forms of AAS may cause liver damage in high doses.