Transdermal patches (adhesive patches placed on the skin) may also be used to deliver a steady dose through the skin and into the bloodstream. 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. 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. There is also the risk that an intimate partner or child may come in contact with the application site and inadvertently dose himself or herself; children and women are highly sensitive to testosterone and can suffer unintended masculinization and health effects, even from small doses. Injection is the most common method used by individuals administering AAS for non-medical purposes. 
As eluded to before, each and every anabolic steroid carries an anabolic and androgenic nature, and as such, we can define this nature by its specific rating. The anabolic and androgenic rating of a particular steroid defines its nature in the anabolic and androgenic regard, but as discussed, what is more important is how these natures translate into action once in the body. Recall our example of Halotestin, a powerful steroid that carries a strong anabolic and androgenic rating, in-fact they are massive yet it displays very few androgenic traits. Then we have steroids like Anadrol that while it carries a modest androgenic rating and decent anabolic rating it translates into action of a higher nature regarding both.