Collagen
Evidence summary
Collagen has moderate evidence in this guide. The reference dose is 10-15g daily, with timing listed as 30-60 minutes before training with vitamin c. Supplements should support a sound diet and training plan, not replace them.
- May support joint health
- Could improve skin elasticity
Benefits
- ✓ May support joint health
- ✓ Could improve skin elasticity
- ✓ Research on tendon/ligament repair promising
- ✓ Easy to add to coffee/smoothies
Possible Side Effects
- ⚠ Not a complete protein (lacks tryptophan)
- ⚠ Evidence still emerging
- ⚠ Quality varies between products
What Is Collagen?
Collagen is the most abundant protein in the human body, making up a significant portion of your skin, tendons, ligaments, cartilage, and bones. As a supplement, it is typically derived from bovine (cow) or marine (fish) connective tissue and comes in hydrolysed form — broken down into smaller peptides for easier absorption.
How It Works
When you consume hydrolysed collagen, it is broken down into amino acids and small peptides (particularly glycine, proline, and hydroxyproline) that may preferentially accumulate in connective tissues. The theory is that these peptides signal your body to increase its own collagen production, supporting joint, tendon, and skin health.
Research by Keith Baar at UC Davis suggests that taking collagen with vitamin C 30-60 minutes before training increases collagen synthesis in tendons and ligaments. The vitamin C is essential — it is a required cofactor for collagen production. Without it, the collagen supplement is significantly less effective.
What the Research Says
The evidence for collagen is promising but still developing. Several studies show improvements in joint pain (particularly in athletes), reduced symptoms of osteoarthritis, and improved skin elasticity. The research on tendon and ligament repair is particularly exciting for athletes recovering from injury or looking to bulletproof their connective tissues.
However, collagen is not a replacement for whey or other complete proteins for muscle building. It lacks tryptophan (an essential amino acid), making it an incomplete protein. Think of it as a targeted supplement for connective tissue, not a general protein source.
Who Should Take It
Athletes with joint issues, anyone recovering from tendon or ligament injuries, older adults looking to support connective tissue health, or people who want to support skin health. It pairs well alongside a complete protein source like whey.
Who Should Skip It
If you are looking for a protein supplement to build muscle, whey or a complete plant protein is a better choice. Collagen alone will not drive muscle protein synthesis effectively.
Vegan?
Collagen is not vegan-friendly. It is derived from animal connective tissue (bovine hide, fish scales, or chicken cartilage). There is no true vegan collagen on the market. Products labelled as “vegan collagen” or “collagen boosters” typically contain vitamin C, glycine, proline, and other nutrients that may support your body’s own collagen production — but they are not actual collagen. If you are vegan and concerned about joint health, focus on vitamin C, glycine-rich foods, and consider targeted joint supplements like glucosamine (though most glucosamine is also animal-derived).
Where to Buy
- Bulk Hydrolysed Collagen — from £12.99
- Amazon — Vital Proteins Collagen Peptides — from £24.99
- Myprotein Collagen Powder — from £14.99
Collagen: common questions
What is collagen used for?
Collagen is commonly considered for may support joint health, could improve skin elasticity, research on tendon/ligament repair promising, easy to add to coffee/smoothies. The evidence rating in this guide is moderate.
When should I take collagen?
The practical timing used in this guide is 30-60 minutes before training with vitamin c. Consistency and the total daily dose are often more important than a narrow timing window.
How much collagen should I take?
The reference dosage in this guide is 10-15g daily. Individual needs vary, so check the product label and speak to a qualified healthcare professional if you have a medical condition, take medication, are pregnant, or are unsure.
Is collagen vegan friendly?
Not every collagen product is vegan friendly. Check the source, capsule material, flavouring, and allergen information on the specific product.
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