The primary protein source critically needed for muscle repair is protein itself. This macronutrient plays a vital role in the recovery and growth of muscle tissues after exercise or injury. Sources of protein include meat, fish, eggs, dairy products, legumes, and nuts. Consuming an adequate amount of protein post-workout helps facilitate the rebuilding of muscle fibers that are broken down during strenuous activities. For athletes, bodybuilders, and anyone engaged in physical training, prioritizing protein intake is fundamental for achieving strength and recovery goals.