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The Types of Collagen —
what sets type I, II, and III apart.
"Collagen" is not one thing. The body makes more than two dozen kinds, each suited to a different tissue — but three dominate the conversation, and knowing which is which changes how you read a label.
I
One word, many
different molecules.
It is easy to talk about collagen as though it were a single substance. In fact it is a family. Scientists have identified more than twenty-eight distinct types of collagen, each a variation on the same basic idea — a triple-helix protein built for structure — but tuned for a particular job in a particular tissue. The collagen in a tendon is not arranged the same way as the collagen in cartilage, and the difference is not incidental. It is the point.
Most of that family, though, is rare. Three types account for the overwhelming majority of collagen in the human body, and they are the three worth knowing by name: Type I, Type II, and Type III. Together they make up the structural backbone of skin, bone, tendon, cartilage, and the walls of organs and vessels. When a label or an article refers to "collagen" without qualification, it is almost always one or more of these three.
This follows directly from the question we asked in marine collagen and the question of source. Source determines what kind of collagen you start with; type determines what that collagen is structurally suited for. Both sit upstream of any other consideration — they describe what the material actually is.
Twenty-eight types exist.
Three carry nearly all the weight.
Knowing which is which changes the label.
The Three That Matter
Type I, II, and III —
and where each one lives.
The most abundant
Type I is by far the most common collagen in the body, making up the large majority of the total. It is the structural collagen of skin, bone, tendon, and ligament — the dense, high-tensile form found wherever tissue needs to resist pulling and bear load. It is also the type most associated with marine sources.
The cartilage form
Type II is the primary collagen of cartilage — the smooth connective tissue at the ends of bones and elsewhere. Its organization differs from Type I, suited to a tissue built for compression rather than tension. It is the type most associated with cartilage specifically rather than skin or tendon.
The companion fiber
Type III frequently appears alongside Type I, forming finer networks in skin, blood vessels, and the walls of internal organs. The two are so often found together that formulas built around Type I commonly include Type III as its constant companion in connective tissue.
II
Why Types I and III
keep each other's company.
Of the three, Types I and III are the pair that turns up together most often. They co-occur throughout the body's soft connective tissue — in skin, in blood vessels, in the framework of organs — where Type I provides the dominant structural fiber and Type III forms the finer network woven through it. They are less two competing options than two parts of one connective fabric.
That pairing is exactly what a marine-sourced collagen tends to deliver, and it is the combination this formula is built on: hydrolyzed wild-caught fish collagen peptides supplying Types I and III, the two forms most associated with skin and the broader connective framework. It is the same logic we followed in collagen and hyaluronic acid — the fiber and the structures around it, considered as a system rather than a single ingredient.
Type II, by contrast, tends to stand apart. Because it is the collagen of cartilage specifically, it is usually discussed and sourced separately from the Type I and III that dominate skin and connective tissue. None of this is a ranking — no type is "better" than another. They are simply different tools for different tissues, which is the whole reason the body bothers to make more than one.
III
Why type belongs in
a longevity conversation.
Structural longevity is the slow upkeep of the body's framework over decades, and that framework is not made of one material but of several, each in its place. Understanding that collagen comes in types is part of reading the body's architecture accurately — recognizing that skin, tendon, and cartilage are built from related but distinct versions of the same protein, and that "collagen" on its own is an incomplete description.
It is the same attention to the framework that runs through the centenarian body — the idea that the structures holding us together are worth understanding precisely, not vaguely. Type is part of that precision. It is the difference between knowing a building is made of "material" and knowing where the steel, the glass, and the stone each go.
So when a label lists a type — I, II, III, or a combination — it is telling you something specific about what the collagen is for. Type I and III point toward skin and connective tissue; Type II toward cartilage. Reading the type is reading the design intent. It is one more way the source and structure of a collagen tell you what you are actually holding.
No type is better than another.
They are different tools
for different tissues.
Codeage · Structural Integrity · Pillar 02
Types I and III,
in a daily ritual.
Codeage Creatine Collagen Peptides is built on 8 g of hydrolyzed wild-caught fish collagen peptides supplying Types I & III — the connective-tissue pair of this article — alongside creatine, magnesium, hyaluronic acid, vitamin C, and biotin. Available in two flavors at equal weight.
Creatine Collagen Peptides — Vanilla
A daily powder pairing 8 g hydrolyzed wild-caught fish collagen peptides (Types I & III) with 3.5 g creatine monohydrate, 125 mg magnesium (glycinate & oxide), 60 mg hyaluronic acid, vitamin C, and biotin. Vanilla.
Add to Cart →Creatine Collagen Peptides — Mango
The same daily formula in a tropical profile: 8 g hydrolyzed wild-caught fish collagen peptides (Types I & III), 3.5 g creatine monohydrate, 125 mg magnesium (glycinate & oxide), 60 mg hyaluronic acid, vitamin C, and biotin. Mango.
Add to Cart →Formulated without dairy, soy, or gluten. Non-GMO. Manufactured in the USA in a cGMP-certified facility with global ingredients.
Previously in This Series
Marine Collagen — Why the Source of Collagen Matters
Codeage · The Longevity Code
A system built for
the long view.
The Longevity Code is a four-pillar daily system — every formula mapped to a specific dimension of how the body sustains itself across time.
Explore The Longevity Code →This article is provided for educational and informational purposes only and has been reviewed against FDA and FTC guidelines to ensure it does not make any health, disease, or treatment claim. Any research or studies referenced were conducted independently and did not involve Codeage products; no Codeage product has been used in any study or to establish, prove, or imply any benefit. These statements have not been evaluated by the Food and Drug Administration. Codeage products are not intended to diagnose, treat, cure, or prevent any disease.
