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Collagen is the most abundant protein in the human body — the structural scaffolding of skin, bones, tendons, ligaments, cartilage, and gut lining. From the age of approximately 25, collagen production begins declining at roughly 1% per year, accelerating dramatically after menopause. The collagen supplement industry has been built on this declining production — but do these supplements actually work?
Key Signs and Symptoms
- Type I collagen: skin, bones, tendons (most relevant for skin anti-aging)
- Type II collagen: cartilage (joint health)
- Type III collagen: skin, muscles, blood vessels
- Marine collagen: derived from fish; predominantly Type I; high bioavailability
- Bovine collagen: derived from cattle; contains Types I and III
- Hydrolyzed collagen peptides: broken down into smaller fragments for improved absorption
Evidence-Based Strategies
- Skin benefits — moderately supported: several randomised controlled trials show hydrolyzed collagen peptides (2.5-10g daily for 8-12 weeks) improve skin elasticity, hydration, and reduce wrinkle depth
- Joint health — moderately supported: Type II collagen and undenatured collagen show benefits for joint pain and cartilage health, particularly in osteoarthritis
- Gut health — preliminary evidence: collagen provides glycine and proline amino acids important for gut lining integrity
- Bone density — emerging evidence: collagen supplementation combined with calcium and vitamin D may improve bone density outcomes
- Always include Vitamin C: collagen synthesis requires vitamin C as a cofactor — take with citrus, berries, or a vitamin C supplement
- Best food sources: bone broth, chicken skin, fish skin, egg whites — these provide collagen precursors alongside supplementation
The Bottom Line
Understanding and addressing collagen supplements requires a comprehensive, evidence-based approach that combines dietary optimisation, targeted supplementation, lifestyle changes, and appropriate medical care. The strategies outlined here represent the current best evidence — always individualise your approach and work with healthcare professionals for personalised guidance.
