Type 1 and type 3 bovine collagen are two forms of the most abundant protein in your body, sourced from cow hides and bones. They’re almost always sold together in supplements because they naturally coexist in the same tissues, particularly skin, and serve complementary structural roles. Type 1 provides rigid strength to skin, bones, and tendons, while type 3 gives flexibility to blood vessels, organs, and muscles.
Where Bovine Collagen Comes From
Bovine collagen has been extracted from cow skin and bones since the 1950s. These tissues are naturally rich in both type 1 and type 3 collagen, which is why most bovine collagen supplements contain both types in a single product. Cowhide in particular mirrors the collagen ratio found in human skin: roughly 80 to 85% type 1 and 8 to 11% type 3. This natural pairing is one reason bovine collagen is so widely used for skin-focused supplements.
What Type 1 Collagen Does
Type 1 collagen makes up about 90% of all the collagen in your body. It’s the primary structural protein in your skin, bones, tendons, ligaments, corneas, and the connective tissue wrapping your organs. Think of it as the steel reinforcing bar inside concrete: it provides tensile strength so tissues can resist being pulled apart.
In bone, type 1 collagen accounts for over 90% of the protein matrix. Mineral crystals anchor themselves to this collagen framework, which is what gives bones both hardness and a degree of flexibility so they don’t shatter on impact. In tendons, it makes up 60 to 80% of the dry weight, creating the tough, rope-like cords that connect muscle to bone. In skin, it forms the dense, woven layer of the dermis that keeps your skin firm.
What Type 3 Collagen Does
Type 3 collagen plays a different structural role. It’s concentrated in hollow organs and tissues that need to stretch and recoil repeatedly: large blood vessels, the uterus, the bowel, and the walls of the bladder and gallbladder. It’s also found in the heart, skin, spleen, and fat tissue. Where type 1 collagen resists pulling forces, type 3 collagen provides the elastic give that keeps these organs from tearing during normal expansion.
Type 3 collagen is also critical in wound healing. It’s the first collagen your body lays down at an injury site, forming a temporary scaffold. Over time, your body gradually replaces much of that type 3 with the stronger type 1 as the wound matures. This is why supplements marketed for skin repair or recovery often emphasize both types together.
How Hydrolyzed Collagen Differs From Raw Collagen
A whole collagen molecule is enormous, around 300 kilodaltons in molecular weight and roughly 280 nanometers long. Your gut can’t absorb something that large efficiently. Hydrolyzed collagen (also labeled “collagen peptides”) has been broken down through enzymes into fragments weighing just 3 to 6 kilodaltons, roughly 1/50th to 1/100th the size of the original molecule. This is what allows the peptides to pass through your intestinal wall and reach your bloodstream.
Most bovine collagen supplements on the market are hydrolyzed. If a label says “collagen peptides” or “hydrolyzed collagen,” the type 1 and type 3 proteins have already been broken into these small, absorbable fragments. Gelatin, by contrast, is only partially broken down and dissolves in hot water to form a gel. It contains the same amino acids but is less convenient for mixing into cold drinks or smoothies.
The Amino Acid Profile
Collagen has a distinctive amino acid makeup that sets it apart from other protein sources. The most abundant amino acid in bovine collagen hydrolysate is glycine, accounting for about 22.6% of the total amino acid content. Glycine is a building block your body uses to produce its own collagen, support joint cartilage, and maintain the gut lining.
Bovine collagen is also unusually rich in proline and hydroxyproline, two amino acids that are rare in most foods. Hydroxyproline in particular is almost exclusive to collagen and plays a direct role in stabilizing collagen’s triple-helix structure in your tissues. This is the main reason people take collagen supplements rather than simply eating more generic protein: the specific amino acid ratios signal your body to ramp up its own collagen production.
What the Research Shows for Skin
Clinical trials on bovine collagen peptides have measured real changes in skin hydration. In one controlled study, participants taking bovine-derived collagen peptides daily saw an 18% increase in skin hydration after just four weeks. By eight weeks, hydration had jumped 29% compared to baseline, and was 26% higher than the placebo group. These are large effect sizes, suggesting the peptides were actively influencing the water-binding structures in the deeper layers of the skin rather than just sitting on the surface.
The mechanism appears to involve stimulating your skin cells (fibroblasts) to produce more of the structural proteins and moisture-retaining molecules that naturally decline with age. This is why the combination of type 1 and type 3 collagen is popular for skin goals specifically: type 1 supports the dermal framework while type 3 contributes to the pliable, hydrated quality of healthy skin.
Bovine Collagen vs. Marine Collagen
Marine collagen, sourced from fish skin and scales, is predominantly type 1 only. Bovine collagen’s advantage is that it naturally provides both type 1 and type 3, making it a broader option if you’re looking for benefits beyond skin alone, such as gut lining support or vascular health.
Marine collagen does have a smaller molecular structure after hydrolysis, which may allow it to be absorbed somewhat more efficiently. Some estimates suggest marine collagen is absorbed up to 1.5 times better than bovine collagen, with absorption rates around 90%. However, both forms are hydrolyzed to similarly small peptide sizes (3 to 6 kilodaltons), and clinical results for skin health have been demonstrated with both sources. The practical difference for most people comes down to dietary restrictions (marine collagen is not suitable for shellfish allergies, bovine is not suitable for those avoiding beef) and whether you want the added type 3 component.
How to Choose a Bovine Collagen Supplement
Look for products labeled “hydrolyzed bovine collagen” or “bovine collagen peptides” that specify types 1 and 3. Grass-fed and pasture-raised sourcing is a quality marker that reflects the conditions of the cattle, though it doesn’t change the collagen’s amino acid composition. Third-party testing certifications (NSF, USP, or Informed Sport) provide more meaningful assurance that the product contains what the label claims.
Collagen peptides are flavorless and dissolve in both hot and cold liquids, which makes them easy to add to coffee, water, or smoothies. Vitamin C is a required cofactor for your body to synthesize its own collagen, so pairing your supplement with a vitamin C source (citrus, bell peppers, or a separate supplement) can support the process. Results for skin hydration appear to begin within four weeks of consistent daily use, with more pronounced effects by eight weeks.