Hydrolyzed collagen comes primarily from the skin, bones, and connective tissues of cattle, pigs, chickens, and fish. These animal tissues are rich in collagen protein, which gets broken down through a combination of heat and enzyme treatment into small peptides your body can absorb. Bovine (cattle) sources dominate the global market at roughly 45% of supply, followed by marine (fish) sources at 25% and porcine (pig) sources at 15%.
Bovine Collagen: The Most Common Source
The majority of hydrolyzed collagen on store shelves comes from cattle. Specifically, manufacturers use cowhides, bones, and cartilage. These tissues are rich in Type I and Type III collagen, the same types that make up most of the collagen in human skin, bones, and tendons. Human skin alone is 85 to 90% Type I collagen and 10 to 15% Type III.
Bovine collagen’s dominance is largely practical. The cattle industry produces enormous quantities of hides and bones as byproducts of meat production, and the infrastructure to collect and process these materials is well established worldwide. This makes bovine collagen the most cost-effective option for supplement manufacturers.
Marine Collagen From Fish Skin and Scales
Marine collagen comes from fish, primarily their skins but also scales and fins. Species used include cod, tilapia, catshark, rabbitfish, and various deep-sea fish like lantern sharks and grenadiers. Fish skin yields significantly more collagen than scales. In tilapia, for example, skin extraction produces about 27% collagen yield compared to just 3% from scales.
Marine collagen is predominantly Type I, which makes it popular in skincare and beauty supplements. It’s also the go-to option for people who avoid beef or pork for religious or dietary reasons. Marine collagen currently accounts for about a quarter of the global collagen market, with demand growing steadily in the supplement and cosmetics industries.
Porcine and Poultry Sources
Pig skin is the primary tissue used for porcine collagen. Like bovine sources, it provides Types I and III collagen, and its protein structure closely resembles the collagen in human connective tissue. This similarity makes porcine collagen particularly useful in medical applications like wound-healing sheets and surgical membranes, though it also appears in food and supplement products.
Chicken collagen fills a different niche. It’s one of the main sources of Type II collagen, the type found in cartilage. This makes chicken-derived collagen popular in joint health supplements. The collagen is typically extracted from chicken feet, cartilage, and sternal (breastbone) tissue. Chicken feet treated with enzymes at various temperatures have been shown to yield collagen with useful functional properties, including the ability to retain water and oil.
How Raw Tissue Becomes Hydrolyzed Collagen
The word “hydrolyzed” refers to the process of breaking collagen’s large, tough protein structure into tiny peptides that dissolve in liquid and pass through your intestinal wall. Raw collagen on its own is indigestible in any meaningful way, so manufacturing involves two key steps.
First, the raw animal tissue is heated above 40°C. This denatures the collagen, meaning it unwinds from its tightly coiled triple-helix structure into loose, separate protein chains. This step essentially converts collagen into gelatin.
Next, enzymes are added to chop those chains into much smaller pieces. Manufacturers use protein-digesting enzymes, with one called alcalase being the most common because it works quickly and produces a broad range of peptide sizes. Other enzymes include pepsin (which works in acidic conditions at pH 1.5 to 2.5), trypsin (which prefers a slightly alkaline environment at pH 7 to 8), and plant-derived options like papain from papaya and bromelain from pineapple. This enzymatic step typically happens at temperatures between 45°C and 55°C.
The final product is a collection of peptides weighing between 3,000 and 6,000 Daltons, a unit of molecular weight. For comparison, intact collagen molecules are roughly 100 times larger. These small peptides dissolve easily in water and are absorbed in the gut through a specific transport system called PepT1, which shuttles small peptides (two or three amino acids long) across the intestinal wall and into the bloodstream.
Why the Source Matters for Collagen Type
Different animals provide different types of collagen, and the type determines what the supplement is best suited for. Type I collagen is the most abundant in the human body and plays a structural role in skin, bones, teeth, tendons, and ligaments. If you’re taking collagen for skin elasticity or bone support, you want Type I, which comes from bovine hides, fish skin, or pig skin.
Type II collagen is the primary protein in cartilage and is used in supplements targeting joint health, particularly for osteoarthritis. Chicken cartilage and bovine cartilage are the main sources. Type III collagen supports blood vessels, the gut lining, and muscles. It’s almost always found alongside Type I in bovine and porcine sources.
Lab-Grown Collagen Without Animals
A small but growing segment of the collagen market uses microorganisms instead of animal tissues. Researchers have engineered both bacteria (E. coli) and yeast (Pichia pastoris) to produce what’s called recombinant human-like collagen. These organisms are given a gene encoding part of the human collagen sequence, then they manufacture the protein during fermentation.
The appeal is straightforward: no risk of animal-borne contamination, no batch-to-batch variation from different animal sources, no religious or ethical conflicts, and a shorter production cycle. Pichia pastoris yeast has emerged as the preferred production host because it can secrete the collagen protein more efficiently than bacteria. However, recombinant collagen remains far more expensive than animal-derived versions and currently occupies a niche market, mostly in biomedical research and high-end skincare rather than mainstream supplements.
What to Look For on the Label
Collagen supplements sold in the U.S. aren’t required to specify which tissues were used, but most reputable brands list the animal source (bovine, marine, porcine, or chicken) and the collagen type (I, II, III, or a combination). If you’re buying marine collagen, look for products that name the fish species or carry certifications from organizations like the Marine Stewardship Council, which independently verifies sustainable fishing practices and tracks the supply chain from ocean to product.
For bovine collagen, terms like “grass-fed” and “pasture-raised” indicate the cattle’s living conditions but don’t speak directly to the collagen extraction process. The more useful detail is whether the product specifies “hydrolyzed collagen peptides” rather than just “collagen” or “gelatin,” since only the hydrolyzed form has been broken into peptides small enough for efficient absorption.