Marine versus bovine collagen is the question most people hit first when they start shopping. Both are genuine collagen supplements; they differ mainly in source, collagen type and a few practical details. Here's a straight comparison to help you choose — without the marketing spin.
For transparency: in Great Britain, collagen is not authorised to carry specific health claims, so nothing here should be read as a promise that either type improves skin, joints or hair. This is about the differences between the two sources and how to choose, not a health claim. Where authorised claims exist, they come from the vitamin C paired with the collagen.
The core difference: source and type
Marine collagen is extracted from fish (typically the skin and scales) and is predominantly Type I — the collagen type most abundant in skin. Bovine collagen comes from cattle and supplies Types I & III, the combination found throughout skin, bone and connective tissue. So the headline distinction: marine is Type I–rich; bovine brings Types I and III.
Marine collagen at a glance
- Source: fish — suitable for pescatarians (not for vegetarians or vegans; no collagen is plant-based).
- Type: predominantly Type I.
- Often chosen by: people focused on a Type I–rich, skin-oriented option who don't eat beef.
- Our version: Marine Collagen Capsules — Type I, with hyaluronic acid and vitamin C.
Bovine collagen at a glance
- Source: cattle — not suitable for vegetarians, vegans, or those avoiding beef for dietary or religious reasons.
- Type: Types I & III.
- Often chosen by: people who want both Type I and III, and frequently a higher dose per gram.
- Our versions: Bovine Collagen Capsules (with hyaluronic acid and vitamin C) and Bovine Collagen Powder (14,000mg, Types I & III).
Which should you choose?
There's no universally superior option — it comes down to three practical questions. Diet: if you don't eat beef but do eat fish, marine is your route; if neither, note that no collagen is plant-derived. Type priority: want a Type I–focused, skin-oriented profile, choose marine; want Types I & III, choose bovine. Format and dose: bovine is available as both capsules and a high-dose powder, while our marine option is a capsule — which leads neatly to the next decision, covered in collagen powder versus capsules.
What they have in common
Both are hydrolysed for clean mixing and absorption, both are described honestly by type and dose, and in our capsule versions both are paired with vitamin C — which contributes to normal collagen formation for the normal function of skin. That vitamin C pairing is the one place an authorised claim genuinely applies, which we cover in collagen and vitamin C. For the full picture on choosing any collagen, see our main guide to choosing a collagen supplement in the UK.
Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle. If you are pregnant, breastfeeding, taking medication or managing a medical condition, speak to your GP or pharmacist before starting a new supplement. Signed, Dr. Miron, Founder of Pure Vitamins UK.
