Collagen

Collagen is the most abundant protein in the human body, making up approximately 30% of all protein and serving as the primary structural component of skin, bones, tendons, ligaments, cartilage, blood vessels, and connective tissue. Think of collagen as the scaffolding that holds your body together — it provides strength, structure, and elasticity to tissues throughout your body.

There are at least 28 known types of collagen, but types I, II, and III account for 80-90% of the collagen in your body. Type I (found in skin, bones, and tendons) is the most abundant and is stronger than steel on a per-weight basis. Type II is the primary component of cartilage. Type III supports the structure of muscles, organs, and arteries. Your body naturally produces collagen by combining amino acids from protein-rich foods with vitamin C, zinc, and copper.

Collagen production naturally declines with age — starting in your mid-20s, you lose approximately 1-1.5% of your collagen each year. This gradual loss is visible in aging skin (wrinkles, sagging, thinning), and felt in joints (stiffness, reduced cartilage). Factors that accelerate collagen breakdown include excessive sun exposure (UV radiation), smoking, high sugar diets (glycation), and chronic stress. This has fueled a booming collagen supplement industry, though the scientific evidence for oral collagen supplementation is still evolving.

Collagen is clinically relevant in dermatology (skin aging and wound healing), orthopedics (osteoarthritis and joint health), and gastroenterology (gut lining integrity). If you're experiencing joint pain, skin changes, or connective tissue problems, your doctor may discuss collagen's role in these tissues and whether dietary or supplemental collagen might be beneficial.

Hydrolyzed collagen supplements (collagen peptides) have shown promising results in some clinical trials for improving skin elasticity, reducing joint pain in osteoarthritis, and supporting bone density, though more research is needed. Supporting your body's natural collagen production through adequate protein, vitamin C, and protection from UV damage remains the most evidence-based approach.