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. 
FDA evaluated the results of numerous studies before approval to determine if Posilac® was safe for treated dairy cows. Many of the studies were conducted under typical farm conditions in multiple regions of the . The effects of treatment were evaluated on all aspects of cows’ health, feed intake, ability to have a calf, and the health of their offspring. FDA concluded that Posilac® was safe to use in healthy dairy cows. Some increased side effects were observed in Posilac®-treated cows, but FDA determined that these effects were manageable under normal . farming conditions. The labeling for the product identifies the potential side effects to treated cows so that dairy farmers can make an informed decision on whether to use Posilac® in their herd. A post-approval monitoring study in 28 herds around the . and including more than 1000 dairy cows confirmed the safety of the product to treated cows. Additional information on the safety of Posilac® for dairy cows is provided in the references below.
"Based on the EU legislation, for any action on the growth promotion in farm animal by using substances having hormones was prohibited in prohibition was applied to the Member States. The first banned was during 1980s regarding the import of hormones raised beef. However based on the US legislation, the FDA permits the use of hormones and synthetic hormones. Recombinant bovine growth hormone (bovine somatotropin) is permitted in USA for dairy cattle only. (Linda A. Mooney David Knox and Caroline Schacht) But countries like Japan, Europe, Canada, Australia and New Zealand banned this milk."