Collagen powder is made from the connective tissues of animals, primarily the skin, bones, scales, and hides of cows, pigs, chicken, and fish. These animal parts are processed through a series of steps that break down the collagen protein into smaller pieces called peptides, which dissolve easily in liquids and are easier for your body to absorb. The specific source and processing method determine the type of collagen you get and how it behaves in your body.
The Raw Materials
Most collagen powder starts as a byproduct of the meat and fishing industries. Bovine (cow) collagen comes from cowhides and bones, making it the most widely available and affordable option. It primarily provides type I and type III collagen, which are the types most abundant in human skin, bones, and tendons.
Marine collagen is extracted from fish skin and scales, sometimes from the bones as well. It’s almost entirely type I collagen, the same type that makes up about 80% of human skin. Marine collagen peptides tend to be smaller than bovine peptides, which some research suggests may improve absorption, though the practical difference for most people is modest.
Chicken collagen comes from the cartilage, bones, and skin of poultry. It’s rich in type II collagen, the kind found in your joint cartilage. Porcine (pig) collagen, sourced from pig skin, is structurally very similar to human collagen and has been used in medical and food applications for decades. If a product doesn’t specify its source, it’s often bovine or porcine.
How Animal Tissue Becomes Powder
Turning raw animal tissue into a fine, dissolvable powder requires several stages of processing. The goal is to isolate the collagen protein, break it into smaller fragments, and dry it into a stable product.
First, the raw materials are cleaned and pretreated. For bovine hides, this usually means soaking them in either an acid or an alkaline (lime) solution for days to weeks. This step removes fats, minerals, and non-collagen proteins, leaving behind a purified collagen matrix. Acid pretreatment tends to be faster and is common for fish and pig sources, while alkaline pretreatment is traditional for thicker bovine hides.
Next comes extraction. The pretreated material is heated in water, which causes the tightly wound collagen fibers to unravel and dissolve. This produces gelatin, which is essentially collagen that has lost its rigid triple-helix structure. If you’ve ever made bone broth and noticed it turn jiggly in the fridge, you’ve seen this process in action. The temperature and duration of extraction affect the quality of the final product: lower temperatures preserve more of the protein’s integrity, while higher temperatures extract more material but can degrade it.
To turn gelatin into collagen peptides (also called hydrolyzed collagen), manufacturers add enzymes that cut the protein chains into much smaller fragments. These peptides typically weigh between 2,000 and 5,000 daltons, compared to full collagen molecules that weigh around 300,000 daltons. This enzymatic hydrolysis is what makes collagen powder dissolve in cold water without clumping, unlike gelatin, which only dissolves in hot water and gels when cooled.
Finally, the liquid is filtered, concentrated, and spray-dried or freeze-dried into a powder. Some manufacturers add a final sterilization step to ensure food safety.
Collagen Peptides vs. Gelatin vs. Undenatured Collagen
These three products all come from the same raw materials but differ in how much the collagen protein has been broken down. Gelatin is partially broken down collagen. It dissolves in hot water and forms a gel when cooled, which is why it’s used in gummy candies, marshmallows, and thickened sauces. Collagen peptides (hydrolyzed collagen) are broken down further into small fragments that dissolve in any temperature liquid and won’t gel. This is what most people mean when they say “collagen powder.”
Undenatured collagen is a less common form that preserves the protein’s original structure. It’s typically derived from chicken cartilage and taken in very small doses (around 40 mg per day compared to 5,000 to 15,000 mg for hydrolyzed collagen). It works through a completely different mechanism, training the immune system to stop attacking joint cartilage rather than providing raw material for the body to use.
What’s Actually in the Powder Nutritionally
Collagen powder is roughly 90% protein by weight. A typical 10-gram scoop contains about 9 grams of protein with minimal fat and carbohydrates. The amino acid profile is distinctive and unlike most other protein sources. About one-third of the amino acids are glycine, with large amounts of proline and hydroxyproline as well. Hydroxyproline is particularly notable because it’s rare outside of collagen and plays a role in stabilizing collagen structures in your body.
What collagen powder lacks is also important. It’s missing tryptophan entirely, making it an incomplete protein. It’s also low in the branched-chain amino acids that are central to muscle building. This is why collagen supplements aren’t a good replacement for other protein sources like whey, eggs, or meat if your goal is muscle growth. They serve a different purpose, supplying the specific amino acids your body uses to maintain skin, joints, bones, and gut lining.
Most collagen powders contain no significant vitamins or minerals on their own, though some brands add vitamin C because it’s essential for your body’s own collagen production. Without adequate vitamin C, your body can’t properly assemble new collagen fibers regardless of how much collagen powder you consume.
How Source Affects What You Get
The animal source determines the collagen type, peptide size, and potential allergen concerns. Bovine collagen is the most versatile and well-studied for skin and bone benefits. It’s also the least expensive to produce at scale. If you have a beef allergy or follow dietary restrictions that exclude beef, this is worth checking on labels, since many products use bovine sources without prominently advertising it.
Marine collagen is popular among people who avoid land animal products or prefer a collagen with smaller peptide sizes. The trade-off is cost: marine collagen typically runs 30% to 100% more expensive than bovine. It also has a faint taste that some people notice in plain water, though most flavored products mask it completely. Anyone with fish or shellfish allergies should check the specific source, as some marine collagens use shellfish-derived materials.
Chicken collagen is the go-to for joint-specific concerns because of its type II collagen content. It’s less common as a standalone powder and more often found in capsule supplements or multi-collagen blends that combine several animal sources into one product.
What Additives Show Up in Commercial Products
Pure collagen powder contains only hydrolyzed collagen and nothing else. In practice, many products include additional ingredients. Common additions are natural or artificial flavors, sweeteners (stevia, monk fruit, or sucralose), hyaluronic acid, vitamin C, biotin, and digestive enzymes. Some products include fillers or flow agents like silicon dioxide to prevent clumping.
If you want to know exactly what you’re getting, look for products that have been third-party tested by organizations like NSF International or USP. Collagen supplements aren’t regulated as strictly as pharmaceuticals, so independent testing is the most reliable way to verify that what’s on the label matches what’s in the container. Some testing has found that certain collagen products contain detectable levels of heavy metals, particularly those sourced from bone, since bones can accumulate lead and cadmium over an animal’s lifetime. Reputable brands test for these contaminants and publish results.