FAQ · Collagen
Marine or bovine collagen, which should I choose?
Marine vs bovine collagen at a glance
| Feature | Marine collagen | Bovine collagen |
|---|---|---|
| Collagen types | Almost entirely Type I | Type I and Type III combined |
| Source | Fish skin and scales | Cow hide |
| Typical molecular weight | 1 to 3 kDa (smallest) | 3 to 6 kDa |
| Best-matched goals | Skin and tendon, where Type I dominates | Skin elasticity plus gut lining and vascular support |
| Relative cost per gram | Usually higher | Lower, often by 30 to 50 percent |
| Dietary notes | Suits pescatarian preference | Halal-certified options exist; grass-fed is the higher-quality source |
When marine wins
- · Skin-first goal where Type I dominance matters.
- · Pescatarian dietary preference.
- · Smallest molecular weight (1 to 3 kDa) for strongest gut absorption.
- · Lower environmental impact compared to bovine in some sourcing models.
When bovine wins
- · Type I plus Type III combined.
- · Cheaper per gram, often by 30 to 50 percent.
- · Wider goal coverage: gut lining, vascular support, alongside skin.
- · Halal-certified options exist; marine collagen typically does not require Halal certification but bovine certification matters more for some consumers.
Sustainability and sourcing
- · Marine wild-caught: typically the most traceable source.
- · Marine farmed: mixed sustainability picture; check brand sourcing statement.
- · Bovine grass-fed: the higher-quality bovine source.
- · Bovine intensively-farmed: the cheaper but lower-welfare option.
Can you take both?
Yes. The two are not mutually exclusive. Some users alternate (marine some days, bovine others) for broader Type coverage. The total daily collagen target (10 to 15 g) is what matters; the source split is preference.
Related: Marine vs bovine deep-dive · Marine vs bovine vs vegan hub · Best UK marine collagen.