Any endocrinologist will confirm that insulin is more anabolic in the body than testosterone for everything, including muscle growth.
Get your insulin functioning properly, by eating a low carb (no milled grain), high protein, moderate healthy fat diet and your muscles will look more robust and healthy, as will your skin and everything about you.
Read on: http://www.sciencedaily.com/releases/2009/09/090925115457.htm
"Do the thing you fear and the death of fear is certain." Ralph Waldo Emerson