What is Serostim (Somatropin) 6mg? Serostim is a brand name for Somatropin, which is a synthetic version of the human growth hormone (HGH). Bodybuilders and athletes have been known to use Somatropin to enhance their physical performance and achieve better results in their workouts. Somatropin is believed to increase muscle mass, reduce body fat, and improve athletic performance b... https://www.yourmuscleshop.to/