Marine, Bovine, or Eggshell Membrane Collagen: Which One Is Best?

Collagen has become one of the most popular supplements for skin, joints, hair, nails, and healthy ageing. But with so many different collagen products on the market - marine collagen, bovine collagen, eggshell membrane collagen, Type I collagen, Type II collagen - it is no surprise that many people feel confused.

Marketing often makes it sound as though each collagen type has one specific role and that one collagen source is clearly superior to another. However, current research suggests the reality may be far more nuanced.

What Is Collagen?

Collagen is not just one substance. It is actually a large family of structural proteins found throughout the body.

Scientists have identified at least 28 different types of collagen in the human body, although

Types I, II, III, V, and X are among the most clinically relevant and commonly discussed in nutrition and supplementation.

The “type” refers to the structure and function of the collagen protein. Different tissues require different collagen architectures depending on whether they need strength, flexibility, elasticity, cushioning, or mineralisation.

Think of collagen as the body’s internal scaffolding. Different tissues require different types of support, so the body creates different forms of collagen to meet those needs.

The Main Types of Collagen

Type I Collagen

Type I collagen is the most abundant collagen in the human body, accounting for around 90% of total collagen.

It is found mainly in:

• Skin

• Hair

• Nails

• Tendons

• Ligaments

• Bones

Its main role is to provide strength and structure. This is why Type I collagen is commonly associated with:

• Skin elasticity

• Anti-ageing support

• Hair and nail strength

• Bone health

Marine collagen is especially rich in Type I collagen.

Type II Collagen

Type II collagen is found mainly in cartilage.

Its role is to provide cushioning and shock absorption within joints. This makes it particularly important for:

• Joint comfort

• Mobility

• Cartilage health

Type II collagen is commonly found in chicken cartilage-based supplements.

Type III Collagen

Type III collagen is found in:

• Skin

• Blood vessels

• Intestines

• Organs

It supports elasticity and soft tissue structure and is often found alongside Type I collagen.

Bovine collagen commonly contains both Type I and Type III collagen.

Type V Collagen

Type V collagen plays more of a regulatory role.

It helps organise collagen fibres and is found in:

• Skin

• Hair

• Cornea

• Placenta

Eggshell membrane collagen naturally contains Type V collagen.

Type X Collagen

Type X collagen is involved in:

• Cartilage repair

• Bone formation

• Mineralisation

It is particularly active where cartilage is transforming into bone and is also found naturally in eggshell membrane collagen.

Marine vs Bovine vs Eggshell Membrane Collagen

Marine Collagen

Marine collagen is sourced from fish and is naturally rich in Type I collagen.

It is commonly marketed for:

• Skin

• Hair

• Nails

• Healthy ageing

Marine collagen is also usually highly hydrolysed, meaning it is broken down into smaller peptides that may improve absorption.

Bovine Collagen

Bovine collagen is sourced from cows and commonly contains both Type I and Type III collagen.

It is often used for:

• Skin support

• Connective tissue

• Muscle and fascia support

• General collagen support

  
  

Eggshell Membrane Collagen

Eggshell membrane collagen is derived from the thin membrane inside eggshells.

Unlike many collagen supplements, eggshell membrane naturally contains a broader connective tissue matrix, including:

• Type I collagen

• Type V collagen

• Type X collagen

• Hyaluronic acid

• Glucosamine

• Chondroitin

This is one reason eggshell membrane collagen is often used for:

• Joint support

• Connective tissue

• Mobility

• Skin hydration

  
  

Are Different Types of Collagen Really That Different?

• For years, collagen marketing has suggested:

  • Marine collagen → usually marketed for skin, hair, nails, and beauty support because it is naturally rich in Type I collagen.

  • Bovine collagen → often marketed for joints, muscles, connective tissue, gut lining, and overall structural support because it typically contains both Type I and Type III collagen.

  • Type II collagen → usually marketed specifically for joint and cartilage support, and is commonly sourced from chicken cartilage or sometimes eggshell membrane products.

  
  

However, newer research suggests the picture may not be quite so simple.

Once collagen is consumed, it is broken down into amino acids and peptides during digestion. The body does not simply “send fish collagen to the skin” or “send bovine collagen to the joints”.

Instead, collagen peptides appear to act as signalling molecules that stimulate the body’s own collagen production.

This may explain why different collagen sources often produce overlapping benefits.

A 2024 human study comparing fish, bovine, and porcine collagen hydrolysates found similar absorption of key collagen-derived peptides regardless of source or molecular weight.

This suggests that collagen source may matter less than previously believed — at least in terms of absorption.

So Is Marine Collagen Better for Skin?

Not necessarily.

Marine collagen is still a very reasonable option for skin support because it is rich in Type I collagen, is usually taken in higher doses, and many skin-health studies use marine collagen.

However, this does not mean other collagen sources are ineffective.

In fact, a recent randomised clinical trial comparing fresh eggshell membrane collagen with hydrolysed collagen found that eggshell membrane improved skin elasticity and firmness despite being taken at a much smaller dose. Researchers believe this may be because eggshell membrane works differently. Rather than simply providing collagen peptides, it provides a broader connective tissue matrix including naturally occurring hyaluronic acid, glycosaminoglycans, elastin, and other structural compounds.

Bovine collagen also remains a valuable option, particularly for broader connective tissue support. Naturally rich in Type I and Type III collagen, it is commonly used to support skin, muscles, tendons, ligaments, bones, and gut health.

The Real Takeaway

The current evidence suggests that collagen source does matter to some extent - but probably not in the simplistic way often presented in marketing. Marine collagen, bovine collagen, and eggshell membrane collagen all have slightly different compositions and strengths.

However, overall collagen metabolism is likely influenced by far more than collagen type alone. Many other actors play major roles in collagen production and skin ageing, such as:

• Protein intake

• Vitamin C

• Zinc

• Copper

• Sleep

• Exercise

• Hormonal health

• Inflammation

• Smoking

• UV exposure

• Blood sugar balance

Final Thoughts

If your primary goal is skin support, marine collagen may still be a sensible option due to its Type I collagen content and strong association with skin-health research.

If you are looking for broader connective tissue support, including skin, muscles, tendons, ligaments, bones, and gut health, bovine collagen may be a valuable all-round choice.

If your focus is joints, cartilage, flexibility, or a more complete connective tissue matrix, eggshell membrane collagen may be an excellent option.

And for vegetarians who consume eggs but avoid bovine collagen, eggshell membrane collagen can be a very reassuring alternative. And for those who prefer to avoid animal products altogether, it is important to remember that the body naturally produces its own collagen. Many plant foods and nutrients can support this process by providing the amino acids, antioxidants, vitamins, and minerals needed for collagen synthesis - a topic that deserves an article of its own.

The most important takeaway is this:

No collagen supplement works in isolation. The best results come from combining collagen supplementation with good nutrition, adequate protein, vitamin C, sleep, exercise, and an anti-inflammatory lifestyle.