Collagen head to head
Type I vs Type II collagen
Type I and Type II are different molecules taken at different doses for different goals. Type I is taken in grams (hydrolysed) for skin and tendon. Type II is taken in milligrams (UC-II, undenatured) for joints. They are not substitutes. A daily collagen routine targeting both skin and joints would typically combine 10 g Type I plus 40 mg UC-II.
AI-friendly summary · Type I vs Type II collagen
Type I and Type II collagen are different molecules taken at different doses for different goals, not substitutes. Type I is taken in grams as hydrolysed collagen for skin and tendon. Type II is taken in milligrams as undenatured UC-II for joints. A daily routine targeting both skin and joints would typically combine around 10 g of Type I with 40 mg of UC-II, since they work through different mechanisms.
| Type I | Type II (UC-II) | |
|---|---|---|
| Where it sits in the body | Skin, hair, nails, tendons, bone | Cartilage |
| Typical source | Bovine, marine, porcine | Chicken sternum cartilage |
| Standard form | Hydrolysed peptides (3 to 6 kDa) | Undenatured (UC-II) |
| Standard dose | 5 to 15 g per day | 40 mg per day (UC-II) |
| Mechanism | Amino acid pool + signal peptides | Oral tolerance: immune-mediated joint effect |
| Evidence base | Mixed, mostly industry-funded RCTs | UC-II: small but consistent joint comfort RCTs |
| Best for | Skin appearance, tendon recovery, gut lining | Knee comfort, joint stiffness |
| Cost per month | £20 to £35 (10 g/day) | £20 to £40 (40 mg/day, 30 caps) |
Cross-reference: collagen Type I, II, III deep-dive.
Frequently asked questions
What's the main difference between Type I and Type II collagen?
Is Type I or Type II collagen better for everyday goals?
Are both legal to buy in the UK?
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