Collagen: Bovine or Fish (Marine)? The Comparison

The short version: Bovine collagen delivers predominantly collagen types I and III and is usually cheaper; fish collagen (marine) consists above all of type I and often scores with a particularly small peptide size. Both are hydrolysed collagen peptides, both are not vegan – the choice is above all a question of your priorities and dietary preferences.

You're standing in front of the collagen shelf and reading „bovine“, „marine“, „type I“, „type I & III“, „hydrolysed“ – and wonder whether that even makes a difference. In short: yes, there are a few practically relevant differences. In this guide we compare bovine and fish collagen in such a way that at the end you know exactly which variant suits you – factually, but without playing down the differences.

The most important points at a glance

• Bovine collagen comes from the connective tissue and hides of cattle and delivers predominantly types I and III.
• Fish collagen (marine) is obtained from the skin and scales of fish and consists predominantly of type I.
• Both are usually offered as hydrolysed collagen peptides – broken down into small, easily soluble fragments.
• Marine collagen often has a particularly small peptide size; bovine collagen is frequently cheaper.
• No collagen is vegan; no health-related statements are currently authorised for collagen in the EU.

What is collagen – and what are peptides?

Collagen is the most common structural protein in the human body and a central building block of connective tissue, skin, bones and cartilage. You can think of it like the fibres in a fabric that give the whole thing hold and tensile strength. In food supplements, animal collagen is almost always hydrolysed – the long protein chains are enzymatically broken down into short chains, the collagen peptides. These are readily soluble in liquid, mostly neutral in taste and can be stirred in easily.

A basic overview of forms and peptides is given in Collagen: forms, peptides & use. Collagen is often considered together with hyaluron; the differences are explained in Collagen or hyaluron.

What do collagen types I, II and III mean?

Before we compare the two sources, it's worth a brief look at the types – because they are the real difference. The types describe in which tissues the respective collagen predominantly occurs in the body:

• Type I is by far the most common collagen and is found above all in skin, bones and tendons.
• Type III often occurs together with type I and is likewise part of skin and connective tissue.
• Type II mostly comes from cartilage and is offered for other areas of application (not from cattle or fish, but typically from chicken cartilage).

Bovine collagen typically delivers types I and III, marine collagen predominantly type I. The type designation thus helps you classify which tissue the collagen originally comes from – this is expressly not connected with any health-related statement.

Bovine collagen in profile

Bovine collagen is obtained from the connective tissue, the hides and partly bones of cattle. It delivers above all the types I and III, which occur in the human body in skin and connective tissue, among others. This combination makes bovine collagen one of the most frequently offered variants on the market: widespread, readily available and often attractively priced – a popular entry point.

For people who don't consume pork for religious or personal reasons, bovine collagen is a common alternative to porcine (pig) collagen. The origin and quality of the raw material are important: pay attention to transparent origin details – such as from pasture farming – and to a tested quality. The light, often neutral inherent taste makes bovine collagen uncomplicated to use, for example stirred into coffee, smoothies or water.

Fish collagen (marine) in profile

Marine collagen comes from the skin and scales of fish and consists predominantly of type I – the type that also makes up the largest share in human skin. It is known for an often particularly small peptide size (low molecular weight), which is why it is readily advertised by providers as easily soluble and fine. How well a substance is absorbed by the body generally depends on several factors – see Bioavailability simply explained.

Marine collagen is often somewhat more expensive than bovine, which is related to the more elaborate extraction. Two points are important: it is a fish product and therefore not suitable for people with a fish allergy. And a slight fishy inherent taste is possible depending on product and quality, but is usually perceived as low with high-quality, well-processed powders. Anyone stirring in marine collagen can additionally mask the taste with juice or flavourings.

Bovine or fish: the direct comparison

The table shows: the choice is above all a question of priorities. Anyone who values a particularly small peptide and a pure type-I profile often tends towards marine collagen; anyone looking for an inexpensive, broadly positioned product with type I and III or wanting to avoid fish reaches rather for bovine collagen. Both are usually offered as a low-flavour powder or in capsules and fit well into everyday life. Whether powder or capsule suits better is clarified in Collagen: powder or capsules?.

Why collagen from animal sources is so old

The idea of deliberately consuming connective tissue is anything but new. Long before there was collagen powder, bone and stock broth was a classic in many kitchens around the world – from French fond to Asian bone broth to grandmother's chicken soup. During the long boiling of bones, skin and tendons, collagen passes into the broth in the form of gelatine; it gels in the fridge, which you can tell from the wobbly consistency. Modern hydrolysed collagen powder is ultimately the concentrated, readily soluble and practical further development of this old idea: the same protein building blocks, only more finely broken down and without hours of cooking. Marine collagen in turn uses fish skin and scales – parts that often used to remain unused.

What research is investigating

Collagen peptides are an active field of research. Among other things, it is being investigated how the body utilises the contained amino acids and small peptides after absorption and whether the peptide size plays a role. Because no health claims are authorised for collagen in the EU, we classify this deliberately with restraint: it's about research directions around a protein building block, not about proven product effects. What is textbook-solid: collagen delivers a characteristic amino acid profile with a lot of glycine, proline and hydroxyproline, and the body continuously forms collagen itself – whereby vitamin C is involved in this body's own formation.

How to find quality – with both sources

Regardless of whether you decide on bovine or fish, it's worth looking at the same quality features:

• Clear origin details (e.g. pasture farming for cattle, region of origin for fish).
• Stated collagen type and the note „hydrolysed“ or „collagen peptides“.
• Laboratory testing for contaminants such as heavy metals – a sensible criterion especially with marine collagen.
• Clean composition without unnecessary additives and with a clear quantity per serving.

What to pay attention to in detail is explored in Recognising collagen quality. As a German manufacturer with laboratory testing, Scheunengut values transparent origin and clean composition.

Honestly classified: what's established and what isn't

No health-related statements (health claims) are currently authorised for collagen in the EU. We therefore describe collagen deliberately factually: its origin, the collagen types, the peptide size and practical properties such as solubility and taste. Statements about a concrete benefit for skin, hair, nails or joints would not be legally permitted – and we therefore don't claim them. What can be said: collagen is a high-quality protein building block that delivers typical amino acids such as glycine, proline and hydroxyproline, and the body forms collagen itself, whereby vitamin C is involved in this body's own formation. Since both sources are of animal origin, no collagen is vegan.

Matching products from Scheunengut

Products around skin, hair and nails – including collagen variants – are bundled in the category Beauty – Skin, Hair & Nails. Anyone wanting to consider collagen in connection with moisture will also find something in the category Hyaluron. In the product description, pay attention to the source (bovine or fish), the collagen type and the note „hydrolysed“ in order to specifically choose the right variant. Anyone wanting to think about the area more broadly will find orientation in Skin, hair & nails: biotin, zinc & selenium and in the comparison Collagen or hyaluron.

Frequently asked questions (FAQ)

Is bovine or fish collagen better?

„Better“ depends on your priorities. Bovine collagen delivers types I and III, is usually cheaper and neutral in taste. Fish collagen (marine) consists predominantly of type I and often has a particularly small peptide size. Anyone wanting to avoid fish or looking for an inexpensive broadband profile chooses bovine; anyone valuing pure type I and fine peptides chooses marine.

What is the difference between type I and type III collagen?

The types describe in which tissues the collagen occurs in the body. Type I is the most common collagen and is found above all in skin, bones and tendons. Type III often occurs together with type I and is likewise part of skin and connective tissue. Bovine collagen typically delivers both, marine collagen predominantly type I.

Does fish collagen taste of fish?

A slight fishy inherent taste is possible depending on product and quality, but is usually perceived as low with high-quality, well-processed powders. Anyone stirring in marine collagen can additionally mask the taste with juice or flavourings. Bovine collagen, by contrast, is usually neutral in taste.

Is there vegan collagen as a bovine or fish substitute?

No. Genuine collagen is always of animal origin – both bovine and marine collagen. A direct vegan substitute with identical collagen does not exist. For a plant-based diet, at most products come into question that support the body's own collagen build-up with building blocks such as vitamin C, which contributes to normal collagen formation.