Collagen is the body’s most abundant protein and a core component of connective tissue in skin, bones, tendons, ligaments, and blood vessels. It plays an important role in strength, elasticity, and structure throughout the body. As we age, collagen production declines, which can affect skin appearance, joint comfort, and recovery. This guide explains collagen synthesis, types, potential benefits of oral collagen supplements, how to choose products, and smart ways to support collagen production with a balanced diet.