Supplements

Where Does Collagen Come From? The Complete Guide to Collagen Sources

Written by Kat Kennedy, NASM CPT, NCSF CPT, NCSF SNS
Medically Reviewed by Dr. Elaine Gavalas, ND, PhD

June 2, 2025

Where does collagen come from? It's one of the most important questions you can ask before investing in any collagen supplement. With the global collagen market exploding and countless products flooding the shelves, understanding the source of your collagen isn't just helpful—it's essential for getting real results.

From the depths of the ocean to grass-fed pastures, collagen sources vary wildly in quality, processing methods, and effectiveness. Marine collagen offers superior absorption, chicken collagen targets joint health specifically, while bovine collagen provides the most comprehensive benefits. Each source undergoes completely different processing methods that can make or break the final product's potency.

In this comprehensive guide, we'll uncover exactly where different types of collagen come from, how they're processed, and most importantly—which source is right for your specific health goals. By the end, you'll know exactly what to look for on that supplement label and why it matters more than you might think.

Table Of Contents

First Things First, What Is Collagen?

Before we explore where collagen comes from, let's talk about what it actually is. Imagine collagen as the body's internal construction crew. It's the most abundant protein in your body, making up about 30% of all your protein content (1). This remarkable substance acts like a biological glue, holding together your skin, bones, muscles, tendons, and blood vessels (2, 3).

Your body naturally produces collagen, but here's the catch—starting around age 25, your collagen production begins to slow down (4). It's like having fewer workers on your internal construction site each year. This is why many people turn to collagen supplements to help fill in the gaps.

A inforgraphic of the effects of collagen loss as your age on skin

Bovine Collagen

A photo of black and white cows grazing in an open pasture

The Source of Bovine Collagen

Bovine collagen comes from cattle, specifically from their hides (the largest source), bones, cartilage, and sometimes tendons. The hide provides primarily Type I collagen, while bones and cartilage contribute both Type I and Type III collagen (5). It's like having access to a comprehensive collagen library all from one source.

Why Bovine Collagen is the Popular Choice

Bovine collagen provides both Type I and Type III collagen, potentially offering comprehensive support for skin, bones, muscles, and cardiovascular health. Its amino acid profile closely matches human collagen, potentially ensuring superior absorption and utilization. 

Clean sourcing from grass-fed cattle helps eliminate the heavy metals, pathogens, and chemical concerns found in other sources. Think of it this way: a cow that spends its days wandering green pastures, breathing fresh air, and eating nutrient-rich grass is going to produce higher-quality collagen than a cow that's stressed, confined, and fed an unnatural grain-based diet. 

The nutritional differences are remarkable— grass-fed bovine collagen contains higher levels of beneficial omega-3 fatty acids, has a better amino acid profile, and comes from animals raised without routine antibiotics or growth hormones (6).

The practical advantages are equally compelling. Bovine collagen tends to dissolve more easily without taste or texture issues, making daily supplementation effortless. Most clinical research proving collagen's benefits has used bovine sources, providing confidence in its effectiveness. With the best cost-per-serving ratio and universal accessibility, bovine collagen potentially delivers optimal results without the limitations that plague other collagen types.

Marine Collagen

A school of silver fish swimming in the ocean

Where Marine Collagen Comes From

Marine collagen comes primarily from fish—specifically from fish skin, scales, bones, and swim bladders.  It can be sourced from jellyfish, sponges, sea urchin, octopus, cod, snapper, or anything under the sea, really (7).

Unique Characteristics of Marine Collagen

Marine collagen is almost exclusively Type I collagen, which is the same type that makes up about 80% of your skin's collagen content (8). This makes it potentially effective for skin health benefits. The molecular structure of marine collagen is also smaller than other types, which potentially makes it easier for your body to absorb and utilize.

The cosmetic industry has found success in using marine collagen to treat burns, open wounds, and as an antimicrobial. And in surgery, it has been used for bone regeneration and cartilage tissue engineering (9).

The Issue With Marine Collagen

Marine collagen primarily contains only Type I collagen, potentially limiting its benefits compared to sources that contain Type I and III. Sustainability concerns plague the industry, with overfishing and ocean pollution leading to products that may contain heavy metals and microplastics. The infamous fishy taste and smell make it unpalatable for many consumers, while the premium pricing doesn't justify the potentially limited nutritional profile.

Porcine Collagen

A group of pigs

The Source of Porcine Collagen

Porcine collagen comes from pigs, primarily from their skin (which makes up the largest portion), bones, and cartilage. The skin is particularly rich in collagen, containing both Type I and Type III collagen in significant amounts.

Unique Characteristics of Porcine Collagen

What makes porcine collagen interesting is its similarity to human collagen. Pig skin has a structure remarkably similar to human skin, which is why it's often used in medical applications like wound dressings and surgical materials (10). This similarity extends to the collagen composition, making porcine collagen highly biocompatible with human systems.

The Issue With Porcine Collagen

Porcine collagen is automatically excluded for millions following Islamic, Jewish, or vegetarian lifestyles due to religious and dietary restrictions. Health concerns include potential pathogen transmission and antibiotic residues from conventional pig farming. The harsh processing required often degrades protein quality, possibly resulting in inconsistent products with reduced bioavailability.

Chicken Collagen

A photo of a flock of chickens

The Source of Chicken Collagen

Chicken collagen comes primarily from chicken cartilage, particularly from the breastbone cartilage (sternum), but also from bones, skin, and eggshell membranes. The cartilage is especially rich in Type II collagen, which is the primary structural component of cartilage tissue throughout your body.

Unique Characteristics of Chicken Collagen

Unlike other collagen sources that are rich in Type I collagen, chicken collagen is predominantly Type II collagen. Think of Type II as the specialist—while Type I collagen is like a general contractor working throughout your body, Type II collagen is the joint specialist, focusing specifically on cartilage health and joint function (11).

The Issue With Chicken Collagen

Chicken collagen predominantly provides Type II collagen, which benefits joints but offers limited support for skin, hair, and overall structural health. The extraction process from poultry often involves aggressive chemical treatments that damage protein structures. Additionally, antibiotic use in poultry farming and contamination risks require extensive processing that may further reduce collagen quality and effectiveness.

Vegan “Collagen”

Let's address the elephant in the room: vegan collagen. You've probably seen products labeled as "vegan collagen" or "plant-based collagen" on store shelves, but here's the truth—these products don't actually contain collagen at all.

Where "Vegan Collagen" Really Comes From

So-called vegan collagen typically comes from a mix of plant-based ingredients like vitamin C, biotin, hyaluronic acid, and various amino acids derived from sources like rice, peas, or other plants (12). Some newer products use lab-grown collagen created by genetically modified bacteria or yeast that have been programmed to produce collagen-like proteins.

Why Vegan Collagen Isn't Actually Collagen

Here's the fundamental problem: true collagen is an animal protein with a specific triple-helix structure that plants simply cannot produce. It's like calling almond milk "milk"—while it might serve some similar purposes, it's fundamentally a different substance entirely.

Plant-based "collagen" products are essentially collagen-support supplements. They provide nutrients that may help your body produce its own collagen, but they don't deliver the actual collagen peptides that your body can directly use for structural repair. Think of it as giving someone the tools to build a house versus giving them pre-built walls—both might help, but one is far more direct and efficient.

The Absorption Problem

Even lab-created "vegan collagen" faces significant challenges (13). The collagen produced by genetically modified organisms often lacks the complete amino acid profile and proper molecular structure of naturally-sourced animal collagen. Your body has evolved over millions of years to recognize and utilize animal-derived collagen, making it potentially more bioavailable than synthetic alternatives.

Additionally, the processing required to create lab-grown collagen often involves harsh chemicals and artificial conditions that may alter the protein structure, potentially reducing its effectiveness compared to naturally-sourced options.

The Bottom Line

Now you know the answer to "where does collagen come from?" isn't simple—it's a fascinating journey from ocean depths to rolling pastures, each with unique benefits and drawbacks. 

Your collagen supplement is only as good as its source. By understanding where collagen comes from and how it's made, you're not just making a purchase—you're making an informed investment in your long-term health and vitality.

Kat Kennedy
Article by

Kat Kennedy

Kat Kennedy is the Fitness and Nutrition Editor at NativePath. With a NASM CPT, NCSF CPT, and NCSF Sports Nutrition Certification, she has a passion for giving people the tools they need to feel healthy, strong, and confident.

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    Medical Disclaimer

    This content is for informational and educational purposes only. It is not intended to provide medical advice or to take the place of such advice or treatment from a personal physician. All readers/viewers of this content are advised to consult their doctors or qualified health professionals regarding specific health questions. Neither Dr. Chad Walding nor the publisher of this content takes responsibility for possible health consequences of any person or persons reading or following the information in this educational content. All viewers of this content, especially those taking prescription or over-the-counter medications, should consult their physicians before beginning any nutrition, supplement, or lifestyle program.

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    Where does collagen come from? It's one of the most important questions you can ask before investing in any collagen supplement. With the global collagen mar...