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. 
Protection against one particular research toxin (7,12-DMBA) has been noted with acute usage of 9mmol/kg calcium-D-glucarate ( 3 hours prior to and another dose 30 minutes prior to DMBA injections) which reduced tumor occurrence from 100% to 30%  and studies with more chronic loading have noted benefit with dietary supplementation of 75mmol/kg (of the diet, /kg bodyweight and 213mg/kg human equivalent).   This protective effect extends beyond breast cancer and is able to attenuate skin cancer with either calcium-D-glucarate itself  or the main bioactive metabolite  (skin cancer is known to be able to be induced by DMBA  ) and may also extend to DMBA induced oral cancers.