Collagen peptides are made from the skin, bones, and connective tissue of animals, most commonly cows and fish. These raw tissues undergo a chemical and enzymatic process that breaks the large collagen protein down into small, easily dissolved fragments. The final powder you scoop into your coffee is essentially a concentrated source of the same structural protein that holds together skin, joints, and bones in both animals and humans.
Animal Sources and Raw Materials
The majority of collagen peptide supplements start as byproducts of the meat and fishing industries. Bovine (cow) collagen comes from hides and bones. Marine collagen comes from the skin, scales, and bones of fish. Pork skin and bones are also used, though less commonly in supplements marketed to consumers. These tissues are naturally dense with collagen because the protein’s job in the animal was the same as it is in your body: providing structural support.
The source matters because different animals yield different types of collagen. Bovine collagen contains both type I and type III collagen, which together support skin, muscles, arteries, and organs. Marine collagen is particularly rich in type I collagen, the same type that makes up about 90% of the collagen in human skin, bones, tendons, and ligaments. This is why marine collagen is often marketed for skin and nail benefits, while bovine collagen is positioned as a broader option covering joints, muscles, and gut health.
How Raw Tissue Becomes a Powder
Turning animal hide or fish scales into a fine, dissolvable powder requires several steps. First, the raw material is cleaned and soaked in either an acid or alkaline solution to strip away fats and minerals. This pre-treatment loosens the tightly wound collagen fibers. The tissue is then heated in water, which unravels the collagen’s triple-helix structure into gelatin, a simpler, partially broken-down form of the protein.
Gelatin is what you get when you boil bones and cartilage for hours, then let the liquid cool and set into a jelly. It’s the same substance that gives bone broth its thick, wobbly texture. But gelatin molecules are still relatively large, so they don’t dissolve easily in cold liquids and can cause clumping.
To create collagen peptides, manufacturers take the process one step further. Enzymes are added to chop the gelatin chains into much smaller fragments. These fragments, called hydrolyzed collagen or collagen peptides, typically weigh between 500 and 1,000 Daltons, a unit of molecular weight. For comparison, a full collagen molecule weighs roughly 300,000 Daltons. The small size of peptides is what allows the powder to dissolve in water, juice, or coffee without gelling or clumping.
What’s Actually in the Powder
Collagen peptides have a distinctive amino acid profile that sets them apart from other protein sources like whey or egg. Amino acids are the building blocks of all proteins, and collagen is unusually heavy on three of them: glycine, proline, and hydroxyproline. In a typical collagen peptide supplement, glycine makes up about 22 grams per 100 grams of product, proline about 13 grams, and hydroxyproline about 12 grams. Together, these three amino acids account for nearly half the total protein content.
This composition is both the strength and the limitation of collagen peptides. Glycine and proline are key raw materials your body uses to build and repair its own collagen. Hydroxyproline is especially notable because it barely exists in other dietary proteins. It plays a critical role in stabilizing collagen’s structure. However, collagen peptides are low in some essential amino acids that your body can’t produce on its own, which is why they don’t count as a complete protein and shouldn’t replace other protein sources in your diet.
Bovine vs. Marine vs. Other Sources
Most collagen peptide products fall into two camps: bovine and marine. Bovine collagen is the most widely available and tends to be less expensive. Because it contains both type I and type III collagen, it appeals to people looking for general benefits across skin, joints, and gut health. The raw material, cow hides and bones, is abundant as a byproduct of beef production.
Marine collagen is extracted from fish and is almost exclusively type I collagen. Some research suggests its smaller peptide size may allow for slightly better absorption, though both forms are well absorbed compared to intact collagen or gelatin. Marine collagen is a common choice for people who avoid beef for religious or dietary reasons, or who prefer a pescatarian option. It tends to carry a higher price tag because fish skins and scales require more processing to remove odor and impurities.
Collagen from pigs and chickens also exists. Chicken-derived collagen is often rich in type II collagen, the type found in cartilage, which is why it sometimes appears in joint-specific supplements. Eggshell membrane collagen is a smaller niche product that contains types I, III, and V.
Plant-Based and Lab-Grown Alternatives
True collagen does not exist in plants. The protein is exclusively an animal product. However, researchers have developed ways to produce human collagen without animals by inserting human collagen genes into yeast or bacteria. These microorganisms, particularly strains of common baker’s yeast, are genetically modified to read the collagen gene and assemble the protein inside their cells. The yeast is then broken open, and the collagen is extracted and purified.
This approach is still largely in the research and specialty manufacturing stage. The yields are improving, but the process is complex: the yeast cells don’t naturally secrete the collagen, so they have to be broken apart and treated with enzymes to isolate the final product. Most consumer supplements labeled “vegan collagen” or “plant-based collagen” don’t actually contain collagen. Instead, they contain nutrients like vitamin C, zinc, and specific amino acids that support your body’s own collagen production. If you see a product claiming to be vegan collagen, check the ingredient list carefully to see whether it contains actual collagen protein or just collagen-supporting nutrients.
What Stays and What’s Removed
A well-made collagen peptide product is almost entirely protein, typically 90% or higher by weight. The manufacturing process strips away fats, minerals, and other cellular material from the original tissue. What remains is a concentrated amino acid profile in small, bioavailable fragments. Most products contain no significant carbohydrates, fats, or fiber.
Some products add vitamin C because the body requires it as a cofactor to build new collagen internally. Others include hyaluronic acid or additional amino acids. Flavored versions will contain sweeteners and natural or artificial flavors. Unflavored collagen peptide powder, at its core, is simply the broken-down protein extracted from animal connective tissue with everything else washed away.