Collagen is the most abundant protein in your body. It is the major component of muscle tissue and connective tissues that make up several body parts, including tendons, ligaments and skin. Collagen has many important functions, including providing your skin with structure and strengthening your bones. It should come as no surprise that it can have a big impact when it comes to building muscle mass. Foods that contain creatine are for instance Steak, Tuna, Chicken, Salmon and Pork. Added Vitamin C, also known as ascorbic acid, is necessary for the growth, development and repair of all body tissues. It’s involved in many body functions, including formation of collagen, absorption of iron, the immune system, wound healing, and the maintenance of cartilage, bones, and teeth.