Definition: Activin is a small protein that your body makes to help regulate blood flow in muscles, tendons, and connective tissue. Activin helps strengthen muscle fibers by preventing them from getting damaged or inflamed. In simple terms, Activin makes muscles stronger so they can do more work. When the body doesn't have enough Activin, it's like the muscles don't get enough energy to do their job, so they become weak and start hurting. Activin is also what your brain sends to the muscles when you're stressed or tense, which helps them relax and let the muscle fibers rest. Activin can work in two different ways: through a protein called Akt, or through a hormone called cAMP. It's important for everyone to have enough Activin because it's really good at helping muscles do their job, but if you don't get too much of it, you may not feel like you're doing anything.

activin