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Collagen is not one protein —
it is a family of twenty-eight,
and the body uses every one.
Twenty-eight distinct collagens have been catalogued in the human body to date. Each occupies a different tissue. Each contributes a different structural role. Each shares the same triple-helix backbone — a design so foundational that it has remained essentially unchanged for over half a billion years of vertebrate evolution. The idea behind a multi-collagen formulation begins here, in the anatomy of a protein family the body has never relied on in isolation.
I
One protein, twenty-eight versions —
and the design that links them all.
Collagen is the most abundant protein in the human body. By mass, it accounts for roughly thirty per cent of every protein the body contains — more than any other single protein family by a wide margin. It is the structural protein of skin, bone, tendon, ligament, cartilage, blood vessel walls, the cornea of the eye, the dentin of teeth, the basement membrane beneath every epithelial surface, and the matrix that holds nearly every soft tissue in shape. Wherever the body keeps its form, it is keeping it largely with collagen.
What is less widely understood is that the word collagen does not refer to a single protein. It refers to a family of related proteins — twenty-eight of them have been formally identified and characterised to date, numbered with Roman numerals from Type I to Type XXVIII. They differ in their precise amino acid composition, in the way their molecules assemble into fibrils or sheets or networks, and in the tissues where they are predominantly expressed. What they share is a structural signature: a triple-helix architecture in which three protein chains wind around one another to form a rope-like molecule of extraordinary tensile strength. The triple helix is the defining feature of collagen. It is what makes the family a family.
The biology that produces this architecture is exacting. Each collagen chain is built from a repeating amino acid sequence in which every third residue is glycine — the smallest of the amino acids — and the two positions between glycines are typically proline or hydroxyproline. This sequence is what allows three chains to coil tightly enough to form the triple helix in the first place. The chemistry is conserved across the family with remarkable precision; the genes that encode the various collagens differ in their fine detail but share the same fundamental grammar. Multi-collagen formulations are built on this biological fact — the body did not evolve to use one collagen type in isolation, and the dietary sources humans have relied on for most of recorded history have always supplied several types at once. The wider biology of structural proteins in long-lived tissue sits in this same conceptual neighbourhood.
About one in three of every protein molecule in the body is a collagen.
No other single protein family is anywhere close to that share.
The Family — Major Members
Five collagens that account
for the structural majority of the body.
Of the twenty-eight catalogued types, five are responsible for the structural majority of human tissue. The remaining twenty-three play essential but more specialised roles — in basement membranes, in the cornea, in the inner ear, in muscle attachment sites — and contribute the architectural detail that the major fibre-forming collagens cannot supply on their own.
Type I
I
Skin · Bone · Tendon
The most abundant collagen in the body — roughly ninety per cent of all collagen present. Type I forms the long, parallel fibres that give tendons their tensile strength, the woven networks of the dermis, and the organic scaffold within bone that the mineral phase deposits onto. It is the collagen most people are referring to, often without realising it, when they speak of collagen at all.
Type II
II
Cartilage
The defining collagen of articular cartilage. Type II forms a meshwork of thinner fibrils that, together with proteoglycans and water, gives cartilage its compressive resilience — the structural property that allows it to absorb load at the surfaces of every moving joint without fracturing. Without Type II, the cartilage that lines the knee, hip, and shoulder would not have the architectural composition it has.
Type III
III
Vasculature · Reticular Tissue
Co-occurs almost everywhere Type I is found, often in a tightly coordinated ratio. Type III contributes to the reticular fibre networks that hold soft organs together and is particularly prominent in the walls of blood vessels, where its mechanical properties differ from those of Type I in ways that suit the demands of vascular tissue specifically. The dermis itself contains roughly fifteen per cent Type III alongside its Type I majority.
Type V
V
Fibril Regulator
A minor component by mass but architecturally essential. Type V molecules co-assemble into the fibrils that Type I and Type III form, and the proportion of Type V present has been shown to govern the diameter of those fibrils — more Type V produces thinner, more uniform fibrils; less Type V allows them to grow thicker. It is one of the molecular regulators that gives different tissues their distinctive collagen fibre dimensions.
Type X
X
Growth Plate · Mineralisation
Found in the hypertrophic zone of the growth plate, where cartilage is being remodelled into bone. Type X is associated with the process by which cartilage matrix becomes calcified — a step that is essential to skeletal growth in childhood and continues, in modified form, in the maintenance of bone structure across adulthood. Eggshell membrane is one of its dietary sources.
II
Why so many types coexist
in the same tissue.
The architecture of biological tissue rarely depends on a single material. Bone is collagen and mineral. Cartilage is collagen and water and proteoglycans. Skin is collagen and elastin and ground substance, arranged in layers. And within each of these tissues, several collagen types coexist — not as redundant copies of the same protein, but as members of an assembly with distinct roles. Type I supplies the bulk fibres. Type III regulates the mechanical properties of those fibres in tissues that need flexibility as much as strength. Type V calibrates fibril diameter. Type II builds an entirely different fibrillar architecture for compressive load. Type X marks the boundary where one tissue becomes another. They work as a system.
This co-occurrence is one of the more elegant features of vertebrate biology. A tendon is not made of one collagen — it is made of Type I as the primary load-bearing fibre, Type III interleaved among the Type I fibres, Type V regulating the diameter at which those fibres pack together, and several minor collagens at the interfaces where the tendon attaches to muscle and to bone. The mechanical properties of the tendon as a whole emerge from the interaction of these components, not from any one of them alone. Subtract any of them and the tendon, in development at least, does not form the architecture it would otherwise form.
The implication for how collagen is consumed dietarily is straightforward. Traditional dietary sources of collagen — bone broths, slow-cooked connective tissues, the cartilage and skin that ancestral diets used routinely — never supplied a single collagen type. They supplied several at once, in proportions reflecting the composition of the tissues they came from. A bone broth made from beef joints contributes substantial Type I (from bone matrix and tendon) alongside Type II (from articular cartilage) and Type III (from blood vessel and reticular tissue). Marine collagen, drawn primarily from the skin and scales of wild-caught fish, is dominated by Type I but in a molecular form distinct from the bovine version. Eggshell membrane introduces Type V and Type X. A formulation that combines several sources is not assembling collagen types that have nothing to do with one another — it is reproducing, in a single serving, the kind of multi-type collagen profile that the body's tissues themselves are built from.
Wherever the body keeps its shape,
it is keeping it with collagen.
And rarely with only one type.
Collagen in numbers
The structural protein of the body,
seen at three different scales.
28
Distinct collagen types catalogued in the human body to date — each with its own gene, its own tissue distribution, and its own contribution to the structural matrix
The numbering runs from Type I through Type XXVIII. New members of the family have been characterised in roughly each decade since the original Types I, II, and III were identified in the mid-twentieth century, and the catalogue is generally regarded as essentially complete — though the structural and regulatory biology of the lesser-studied members continues to be refined.
~30%
Of all protein in the human body, by mass, is collagen — making it the single most abundant protein family the body produces
No other protein family approaches this share. For comparison: the contractile proteins of muscle account for a smaller fraction; the haemoglobin of the blood, smaller still; the immunoglobulins of the immune system, smaller again. Collagen's share reflects the structural cost of building a vertebrate body that retains its shape across a lifetime.
500M+
Years of evolutionary history during which the triple-helix architecture of collagen has remained essentially unchanged across vertebrate lineages
Collagen-like proteins appear in the earliest vertebrate ancestors and in invertebrate lineages older still. The triple-helix design has been conserved through every major vertebrate transition — the move onto land, the radiation of mammals, the emergence of every modern body plan — because, structurally, the design admits very little room for revision in the role it performs.
III
What the family tells us
about how to think about collagen.
The architecture of the collagen family explains why a particular kind of formulation exists. A single-source collagen supplies one or two of the major types, depending on the tissue it was extracted from. Bovine hide is dominated by Type I, with a measurable Type III component. Bovine cartilage is dominated by Type II. Marine sources are nearly all Type I, but in a distinct molecular form with lower average molecular weight than its bovine counterpart. Eggshell membrane carries Type I, Type V, and Type X in a single matrix. None of these sources, on its own, reproduces the full structural diversity that the body's own tissues display. A multi-collagen formulation is the deliberate response to that biological observation: combine several sources, contributing several types, to create a profile that mirrors the multi-type architecture the body itself is built from. The reasoning is not new — bone broth, made for centuries from the entire connective tissue complex of an animal, was already a multi-collagen preparation in everything but name.
What collagen does inside the body, once consumed, is the subject of a great deal of ongoing investigation. Hydrolysed collagen and collagen peptides — collagen broken down into shorter chains during processing — are digested as proteins are digested, releasing amino acids and short di- and tripeptides that the body uses as substrate for its own protein synthesis, including the synthesis of new collagen by fibroblasts and chondrocytes. The amino acid profile of collagen is distinctive — glycine, proline, and hydroxyproline together account for the majority of its residues, in proportions that do not occur in this density in any other dietary protein. As with much of the biology of structural proteins, the literature here continues to develop, and the picture described in this article reflects the current understanding rather than a closed account.
Multi-collagen formulations sit, in the end, on a fairly straightforward biological premise. The body's structural tissues are built from a family of collagens that act as a system, not as isolated proteins. Dietary sources that supply several types at once mirror this biological reality more closely than sources that supply only one. Whether the formulation is taken as a powder, peptides, capsules, or the broth that pre-dates all of these, the underlying logic is the same: a structural protein family that the body uses in combination is most coherently approached, dietarily, in combination. The rest of the collagen series will work through the individual members, the cell that produces them, the sources that supply them, and the biology that decides how they are used. Studies referenced here were conducted independently and did not involve any specific Codeage product.
Codeage · Structural Integrity · Pillar 02
A multi-collagen architecture,
built around the family.
Codeage's multi-collagen formulations bring together five collagen types — I, II, III, V, and X — drawn from grass-fed bovine, wild-caught marine, chicken cartilage, and eggshell membrane sources, in a single serving designed around the multi-type biology described above.
Multi Collagen Protein Powder
Five collagen types — I, II, III, V, X — drawn from four sources: grass-fed bovine, wild-caught marine, chicken cartilage, and eggshell membrane. Unflavoured. Mixes into water, coffee, or smoothies. The flagship of the Codeage collagen architecture.
View Product →Multi Collagen Peptides Powder Platinum
The Platinum line — five collagen types from four sources combined with biotin, keratin, hyaluronic acid, and supporting vitamins. Hydrolysed peptide format. Designed for those approaching collagen as part of a broader structural-integrity system.
View Product →Multi Collagen Protein Capsules
The same five-type, four-source multi-collagen profile in capsule form. For those who travel, who prefer not to mix a powder, or who use collagen alongside a daily set of foundation formulations. Same structural architecture, different delivery format.
View Product →Previously in the Codeage library
The cell runs a continuous protein quality operation — and aging is partly what happens when it slows.
Codeage · The Longevity Code
A system built for
the structural long view.
The Longevity Code is a four-pillar daily system — every formulation mapped to a specific dimension of how the body sustains itself across time. Multi-collagen is the structural protein of Pillar 02.
Explore The Longevity Code →
