Collagen supplements are made by extracting collagen protein from animal tissues, breaking it down into small, absorbable fragments using acids and enzymes, then purifying and drying the result into a powder, liquid, or capsule. The process transforms tough, fibrous connective tissue into something your body can actually use, and it involves several distinct stages from raw material to finished product.
Where the Raw Material Comes From
Nearly all collagen supplements start with animal byproducts from the food industry. The specific source determines what type of collagen ends up in the final product.
Bovine collagen uses the skin, bones, and Achilles tendons of cattle. These tissues are rich in both type I collagen (the kind most abundant in human skin, tendons, and bones) and type III collagen, which provides strength and flexibility to soft tissues. Porcine collagen similarly comes from pig skin and bones, and it’s widely used in both supplements and the pharmaceutical industry because its structure closely resembles human collagen.
Marine collagen draws from fish skin, bones, fins, and scales, along with invertebrates like jellyfish, squid, and prawns. Marine sources are particularly rich in type I collagen, making them popular in skin-focused supplements. Fish collagen also tends to have smaller peptide chains, which some manufacturers market as easier to absorb.
These raw materials arrive at processing facilities as waste from meat and fish processing. The hides, bones, and scales would otherwise be discarded, so collagen production is essentially a way of extracting value from parts of the animal that don’t end up on your plate.
Cleaning and Pre-Treatment
Raw animal tissue is far from supplement-ready. It contains fats, minerals, pigments, and other proteins that need to be stripped away before collagen extraction can begin. The first step is thorough washing and mechanical cleaning to remove surface contaminants, followed by chemical pre-treatment.
For most sources, the tissue is soaked in either an acidic or alkaline solution. Acid pre-treatment works well for thinner materials like fish skin and scales, while alkaline solutions (typically using lime) are better suited for thicker bovine hides and bones. This soaking step loosens the collagen fibers from surrounding tissue and begins to dissolve unwanted components. Bones often undergo an additional demineralization step, where they’re treated with acid to dissolve the calcium and phosphorus that make bone rigid, leaving behind the soft collagen matrix.
Extracting the Collagen
Once pre-treated, the material is heated in water to dissolve the collagen. This is essentially the same process that happens when you simmer bones for broth. The heat breaks the bonds holding collagen’s signature triple-helix structure together, causing the protein to unwind and dissolve into the liquid. The temperature and duration are carefully controlled because too much heat degrades the protein, while too little leaves collagen trapped in the tissue.
This extraction produces gelatin, a partially broken-down form of collagen. Gelatin is a useful product on its own (it’s what makes Jell-O gel), but it has relatively large molecules that the body doesn’t absorb efficiently. For supplements, manufacturers need to break it down further.
Breaking Collagen Into Peptides
The step that separates a collagen supplement from a packet of gelatin is hydrolysis. This is where large collagen chains are cut into much smaller fragments called peptides.
Manufacturers add specific enzymes to the gelatin solution. These enzymes act like molecular scissors, snipping the long protein chains at particular points. The process is often combined with acidic conditions, which research has shown produces more efficient extraction results than using enzymes or acid alone. Different enzymes cut at different locations along the chain, giving manufacturers control over the size of the resulting peptides.
The goal is to produce hydrolyzed collagen with a molecular weight between roughly 500 and 6,000 daltons. For context, intact collagen molecules weigh around 300,000 daltons, and gelatin typically falls in the 20,000 to 100,000 range. Peptides in the 500 to 1,000 dalton range are small enough to pass through tissue membranes more readily. Some manufacturers use specialized membrane reactors that filter the solution during enzymatic treatment, allowing them to collect peptides of a specific size range and produce a more consistent product.
Purification and Deodorizing
After hydrolysis, the liquid contains collagen peptides along with fats, salts, and odor-causing compounds. Marine collagen in particular carries a strong fishy smell from compounds like trimethylamine, the same molecule responsible for the characteristic odor of seafood.
Purification typically involves filtration to remove fats and particulates, followed by more advanced techniques like ion exchange chromatography for deodorizing. In this process, the collagen solution is adjusted to a specific acidity level and passed through a column of charged resin beads. The collagen peptides and the odor molecules bind to the resin with different strengths, so when the column is flushed with a buffer solution, they separate. The collagen peptides wash off at a different rate than the unwanted compounds, allowing manufacturers to collect clean, neutral-smelling collagen while leaving the fishy or animal odors behind.
After chromatography, the solution goes through desalination to remove residual salts from all the acid and alkali treatments used earlier in the process.
Drying Into a Finished Powder
The purified collagen solution is still mostly water at this point, so it needs to be dried into a stable powder. The standard industrial method is spray drying, where the liquid is pumped through a fine nozzle into a chamber of hot air. The tiny droplets dry almost instantly as they fall, producing a fine powder that collects at the bottom.
Inlet temperatures for spray drying collagen typically range from 140 to 160°C (284 to 320°F). Despite those high air temperatures, the collagen itself stays much cooler because the rapid evaporation of water absorbs most of the heat. This is similar to how you can briefly pass your hand through a hot oven without burning. Some manufacturers encapsulate their collagen in a protective shell of plant-based starches before drying, which improves stability during storage and helps the powder dissolve more easily in liquids.
The resulting powder is highly soluble in water, nearly tasteless (especially after deodorizing), and shelf-stable for extended periods. From here, it’s either packaged as a standalone powder, pressed into tablets, filled into capsules, or dissolved into ready-to-drink liquids.
How Vegan Collagen Alternatives Are Made
A small but growing number of products use bioengineered collagen that doesn’t come from animals at all. Instead of extracting collagen from tissue, manufacturers insert human collagen genes into microorganisms like bacteria (commonly E. coli) or yeast. These engineered microbes are grown in large fermentation tanks, where they produce human collagen proteins as part of their normal metabolic activity.
The collagen is then separated from the bacterial cells, purified, and processed similarly to animal-derived collagen. Because the inserted gene codes for a specific human collagen type (such as type III), the result is structurally identical to what your body produces naturally. This approach is still more expensive and less widely available than animal-sourced collagen, and most “vegan collagen” supplements on the market today don’t actually contain collagen. They contain vitamin C, zinc, and amino acids intended to support your body’s own collagen production.
Quality Control and What’s Not Regulated
Collagen supplements fall into the dietary supplement category in most countries, which means they aren’t subject to the same pre-market approval that pharmaceuticals require. Manufacturers are responsible for their own quality testing, and the rigor of that testing varies widely between brands.
The main concerns are heavy metal contamination (since animal bones and fish can accumulate lead, arsenic, cadmium, and mercury over their lifetimes) and accurate labeling of collagen content. Reputable manufacturers test for heavy metals at multiple stages of production and submit their finished products to third-party labs. Look for products that carry a certification from organizations like NSF International or USP, which independently verify that what’s on the label matches what’s in the container. Without third-party testing, there’s no guarantee that a collagen supplement contains the amount or type of collagen it claims, or that contaminant levels fall within safe ranges.