Neither has been shown to be clearly better for skin in head-to-head human trials. Marine collagen is mostly type I and suits pescatarians and people avoiding beef; bovine collagen offers types I and III and is usually easier to find. Pick by diet, allergies and taste.
Side by side
| Marine | Bovine | |
|---|---|---|
| Source | Fish skin and scales | Cattle hides |
| Collagen types | Mainly type I | Types I and III |
| Diet fit | Pescatarian, no beef | Not for pescatarians |
| Allergy note | Avoid with fish allergy | Generally fine with fish allergy |
| Taste | Can be slightly fishy | Usually neutral |
The “better absorption” claim
Marine collagen is often marketed as better absorbed because of smaller peptides. Absorption depends more on how finely a product is hydrolysed than on the animal it came from, and there is no strong evidence that this translates into visibly better skin.
What the evidence says overall
Independent reviews are mixed for skin benefits from any collagen powder. See what the 2025 meta-analysis found before you buy.
Our picks
For marine, Vital Proteins Marine Collagen. For bovine, Sports Research Collagen Peptides. More options in best collagen supplements.