Fermented dairy products like kefir are a little-known magic bullet for muscle building. Kefir is the perfect addition to any muscle-building blender bomb, providing distinct nutritional advantages over water or regular milk. If you usually use water in your shakes, 1 cup of kefir will add 150 calories to your diet. Compared to regular milk, kefir will allow your meal to be more easily digested due to the presence of probiotics (up to 10 billion good bacteria per cup). These healthy bacteria will help keep your digestive track running at peak condition so it can break down and assimilate a maximum amount of calories and nutrients from your meals.
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.