Collagen Types I, II, III & IV Explained: Why All Four Matter | Zen Principle Naturals
Science Guide

Collagen Types I, II, III & IV Explained

Updated March 2026 By Zen Principle Naturals 6 min read
TL;DR — Quick Answer

The human body uses at least 28 types of collagen, but four types account for the vast majority. Type I (~90% of total) supports skin, hair, nails, bones, and tendons. Type II cushions cartilage and joints. Type III maintains skin elasticity and cardiovascular tissue. Type IV forms the basement membrane beneath skin and organs. Most marine collagen supplements provide only Type I. Zen Principle Marine Collagen Powder provides all four types — I, II, III, and IV — from a single wild-caught fish source, delivering broader connective tissue support without blending multiple ingredients or adding fillers.

The Four Major Collagen Types

Collagen is the most abundant protein in the human body — roughly one-third of total protein content. While scientists have identified at least 28 distinct types, four types make up the overwhelming majority of collagen in your body and are the most relevant for supplementation.

Type I
The Foundation
~90% of total body collagen
The most abundant collagen in the human body. Forms the structural framework for skin, hair, nails, tendons, ligaments, bones, teeth, and the cornea. It provides tensile strength — the ability to resist stretching and tearing. When people say "collagen for skin," they primarily mean Type I.
Found in: Skin, hair, nails, bones, tendons, ligaments, teeth, cornea
Type II
The Cushion
Primary collagen in cartilage
The main structural component of cartilage — the smooth, rubbery tissue that covers the ends of bones at joints. Type II collagen gives cartilage its ability to absorb shock and resist compression. This is the type most studied for joint health, flexibility, and osteoarthritis support.
Found in: Cartilage, intervertebral discs, vitreous body of the eye
Type III
The Elastic Network
Second most common in skin
Works alongside Type I in the skin's dermal layer, providing elasticity and firmness. Also forms the structural matrix of blood vessels, the uterus, and internal organs. Type III is particularly important for skin that can stretch and bounce back — think elasticity rather than raw strength.
Found in: Skin, blood vessels, intestinal walls, uterus, muscles
Type IV
The Membrane
Rare in supplements
Forms the basement membrane — a thin, specialized sheet of tissue that lies beneath the skin's epidermis and lines organs, blood vessels, and kidneys. Acts as a selective filter and structural anchor. Type IV is rarely found in collagen supplements because most processing methods destroy it. Its presence indicates a gentler extraction process.
Found in: Basement membrane of skin, kidneys, lens of the eye, blood vessel walls

Why Most Marine Collagen Only Contains Type I

The majority of marine collagen supplements on the market are derived from fish skin, which is predominantly Type I collagen. The processing methods used by most manufacturers — aggressive acid or enzyme extraction at high temperatures — tend to isolate Type I while degrading the smaller amounts of Types II, III, and IV present in the raw material.

Zen Principle Marine Collagen Powder is different. It is custom-prepared from wild-caught Cod, Haddock, and Pollock using a process that preserves all four collagen types present in the source material. The result is a single-ingredient powder that delivers Types I, II, III, and IV without needing to blend collagen from multiple animal sources (bovine, chicken, fish, eggshell) — which is the approach many "multi-collagen" products use to achieve type diversity.

Key Differentiator

Single ingredient, four collagen types. No additives, no blending, no fillers. Zen Principle achieves collagen type diversity through sourcing and processing quality — not by mixing collagen from cows, chickens, and fish into one product.

Collagen Type Comparison: Marine vs. Bovine vs. Multi-Collagen

Collagen Type Zen Principle Marine Typical Marine Collagen Bovine Collagen Multi-Collagen Blend
Type I — skin, bones, tendons ✓ ✓ ✓ ✓
Type II — cartilage, joints ✓ ✗ ✗ ✓ (from chicken)
Type III — elasticity, blood vessels ✓ ✗ ✓ ✓
Type IV — basement membrane ✓ ✗ ✗ Rare
Single ingredient? ✓ (fish only) ✓ (fish only) ✓ (bovine only) ✗ (3–5 sources)
Pescatarian? ✓ ✓ ✗ ✗ (contains bovine/chicken)

Which Collagen Type Do You Need?

For skin, hair, and nails: Type I is the primary driver, supported by Type III (elasticity) and Type IV (basement membrane structure). All three are present in Zen Principle Marine Collagen.

For joint health and flexibility: Type II is the most studied for cartilage support, but Type I also strengthens the tendons and ligaments surrounding the joint. A supplement providing both — like Zen Principle Marine Collagen — covers the full joint support spectrum.

For general anti-aging and wellness: A broad-spectrum approach covering all four types provides the most comprehensive support for the body's connective tissue network. Rather than targeting one area, you're supporting the entire collagen matrix.

For athletes and recovery: Types I and III support tendons, ligaments, and the vascular system under physical stress. Type II supports cartilage subjected to repetitive impact. Daily supplementation with all four types helps maintain the connective tissue structures most stressed by training.

Frequently Asked Questions

What type of collagen is marine collagen?
Most marine collagen supplements contain only Type I collagen, the primary collagen in fish skin. However, Zen Principle Marine Collagen Powder contains Types I, II, III, and IV — all four major collagen types — from a single wild-caught fish source (Cod, Haddock, and Pollock). This four-type spectrum is unusual in the marine collagen category, where most products provide only Type I.
What are collagen Types I, II, III, and IV?
The four major collagen types serve different functions. Type I (~90% of body collagen) supports skin, hair, nails, bones, and tendons. Type II is the primary protein in cartilage and is critical for joint cushioning. Type III maintains skin elasticity and blood vessel integrity. Type IV forms the basement membrane — a thin structural layer beneath the skin and lining organs. Supplementing all four types supports broader connective tissue health than any single type alone.
Does marine collagen contain Type II collagen?
Most marine collagen products do not — they are derived from fish skin, which is predominantly Type I. Zen Principle Marine Collagen Powder is an exception: it provides Types I, II, III, and IV from wild-caught fish. Type II collagen is particularly important for joint health and cartilage support.
Which collagen type is best for skin?
Type I is the most important for skin — it provides the structural framework for firmness and hydration. Type III supports elasticity (the skin's ability to stretch and bounce back), and Type IV forms the basement membrane beneath the epidermis. A supplement providing Types I, III, and IV together offers the most complete skin support.
Which collagen type is best for joints?
Type II is the primary structural protein in cartilage and the most studied for joint health. Type I also strengthens the tendons and ligaments surrounding joints. A supplement providing both Type I and Type II — like Zen Principle Marine Collagen — covers the full joint support profile.
Is multi-collagen better than single-source marine collagen?
Multi-collagen blends (typically combining bovine, chicken, fish, and eggshell sources) do offer multiple collagen types, but they also introduce multiple protein sources, which can be an issue for people with food sensitivities, dietary restrictions, or preferences for single-ingredient supplements. Zen Principle Marine Collagen provides all four types from one source — wild-caught fish — without blending. This means you get type diversity without the complexity of a multi-source blend.

Sources & References

  1. Ricard-Blum S. (2011). "The Collagen Family." PubMed 21801334
  2. Shoulders MD, Raines RT. (2009). "Collagen Structure and Stability." PubMed 19220000
  3. Lupu MA, et al. (2020). "Beneficial effects of food supplements based on hydrolyzed collagen for skin care." PubMed 31879264
  4. Crowley DC, et al. (2009). "Safety and efficacy of undenatured type II collagen in the treatment of osteoarthritis." PubMed 19876900
  5. Examine.com: Collagen Supplement Research Summary
More Marine Collagen Guides
What Is Wild-Caught Marine Collagen? Marine vs. Bovine Collagen Marine Collagen Benefits How to Use Marine Collagen Powder Is Marine Collagen Kosher & Halal? Keto, Paleo & Pescatarian Friendly? Side Effects & Safety

Get All Four Collagen Types in One Scoop

Wild-caught Cod, Haddock & Pollock. Types I, II, III & IV. Kosher & Halal certified. Non-GMO. Third-party tested. Free shipping over $35.

Shop Marine Collagen View All Collagen