Follistatin is a protein-sugar hybrid called a glycoprotein, produced by the liver, it is found everywhere in the body.
It is of great interest to performance enhancers and longevity scientists because of its role in increasing muscle tissue in response to any muscle damage, and basically promotes cell growth throughout the body.
There are many forms of Follistatin, 344, 315, 288, 300. Follistatin 344 is the most basic form, and it is the one currently studied in gene therapy. Follistatin 344 can be converted into more specific types to target different parts of the body.