Collagen
Collagen is a protein supplement — a structural protein family found in connective tissue; supplements often use hydrolyzed "peptides.". 20 peer-reviewed studies are available in our database. Common forms include Hydrolyzed Collagen, Type I & III, Type II.
Content reviewed by Zynava Research Team · Last updated February 2026 · Editorial policy
Find Quality Collagen Supplements
Explore collagen supplements and browse options based on ingredient research.
What Is Collagen?
A structural protein family found in connective tissue; supplements often use hydrolyzed "peptides."
Key fact: Type I/III are common; Type II is used in some joint formulas.
Collagen Supplement Forms
Collagen is available in several supplemental forms: Hydrolyzed Collagen, Type I & III, Type II, Marine, Bovine. Type I/III are common; Type II is used in some joint formulas.
Explore Collagen Supplements
Use our research tool to explore collagen supplements and see what studies have examined.
Research Studies on Collagen
Our database contains 20 peer-reviewed studies examining collagen. Below are selected recent studies:
Health Goals Associated with Collagen
Research has examined collagen in relation to several health areas:
Related Supplements
Frequently Asked Questions About Collagen
What is Collagen?
A structural protein family found in connective tissue; supplements often use hydrolyzed "peptides."
What are the different forms of Collagen?
Collagen is available in several supplemental forms including Hydrolyzed Collagen, Type I & III, Type II, Marine, Bovine. Type I/III are common; Type II is used in some joint formulas.
What health goals is Collagen associated with?
Research has examined collagen in relation to several health areas including bone joint, hair health, skin health, nail health. The best supplement depends on individual factors — consult a healthcare professional for personalized guidance.
Natural Food Sources of Collagen
Collagen can be obtained from a variety of whole foods. A food-first approach is generally recommended by nutrition experts, with supplementation considered when dietary intake is insufficient or when specific circumstances increase requirements.
- Bone broth — Simmering bones for 12-24 hours extracts collagen and gelatin into the broth
- Chicken skin — A natural source of type II collagen
- Fish skin — Contains type I collagen, which is similar to human skin collagen
- Pork skin — Used in traditional dishes and as a source of type I and III collagen
- Gelatin — Cooked collagen used in various foods and desserts
Dietary Context
Collagen is the most abundant protein in the body, making up about 30% of total protein. Unlike most nutrients, collagen is not found in plant foods — it is exclusive to animal connective tissues, skin, and bones. The body synthesizes its own collagen using amino acids (particularly glycine, proline, and hydroxyproline) along with vitamin C as a cofactor.
Absorption: Food vs. Supplements
Dietary collagen is broken down into amino acids and peptides during digestion. Hydrolyzed collagen supplements (collagen peptides) are pre-broken-down for easier absorption. Vitamin C is essential for the body's own collagen synthesis, making it an important complementary nutrient.
Practical Tips
- Bone broth is a traditional way to get dietary collagen — longer cooking times extract more
- Vitamin C-rich foods support the body's own collagen production
- Plant foods don't contain collagen but provide the building blocks (amino acids and vitamin C) for collagen synthesis
How to Take Collagen
How you take collagen matters. Factors like timing, food intake, and interactions with other supplements can all influence absorption and efficacy. Here is what the research suggests.
Best time to take: On an empty stomach or between meals for best absorption
With or Without Food
Collagen peptides can be taken with or without food, but absorption may be slightly better on an empty stomach. Collagen dissolves easily in both hot and cold liquids.
How Often
Once daily. Most studies showing benefits use 2.5-15 grams daily for 8-12 weeks.
Practical Tips
- Hydrolyzed collagen (collagen peptides) is pre-broken-down for better absorption than gelatin
- Mix into coffee, smoothies, or water — collagen peptides are virtually tasteless
- Pair with vitamin C, which is essential for the body's own collagen synthesis
- Allow 8-12 weeks of consistent use to see skin, joint, or nail benefits
Important Interactions
- Generally very well-tolerated with no known significant drug interactions
- Marine collagen may not be suitable for people with fish allergies
- May cause mild digestive symptoms (bloating, fullness) when starting
This is not an exhaustive list of interactions. Always consult a healthcare provider or pharmacist about potential interactions with your specific medications and health conditions.
Where to Find Collagen Supplements
Finding a quality collagen supplement starts with choosing the right retailer. Established retailers offer customer reviews, detailed product information, and quality guarantees that can help inform your purchase decision.
How to Choose a Quality Collagen Supplement
- Look for Good Manufacturing Practice (GMP) certification on the label
- Check whether the product uses the specific form of the ingredient you are looking for
- Review customer feedback and ratings for real-world product experiences
- Consider the supplement form (capsule, powder, liquid, gummy) that best suits your preference
To explore supplements by ingredient or health goal, try our AI Supplement Advisor.
Research Highlights: Collagen
Published research on collagen spans 2024 to 2025 and includes 2 clinical trials, 2 reviews, 1 meta-analysis, 1 systematic review. The selected summaries below provide an overview of what these studies examined and found. Evidence quality varies across studies, and findings should be discussed with a healthcare provider.
Effect of collagen supplementation on knee osteoarthritis: an updated systematic review and meta-analysis of randomised controlled trials
Published in Clin Exp Rheumatol. Study from 2025. Comprehensive analysis combining multiple studies.
Source: View full study on PubMed
Can good sleep quality enhance the benefits of oral collagen supplementation in the prevention of skin aging? A brief report
Published in Arch Dermatol Res. Study from 2025.
Source: View full study on PubMed
Collagen supplementation in metabolic syndrome: a narrative review unraveling the biological mechanisms and effects
Published in Nutr Res Rev. Study from 2025.
Source: View full study on PubMed
Efficacy of combined undenatured type II collagen and hydrolysed collagen supplementation in knee osteoarthritis: a randomised controlled trial
Published in Sci Rep. Study from 2025.
Source: View full study on PubMed
The Effects of Collagen Peptides as a Dietary Supplement on Muscle Damage Recovery and Fatigue Responses: An Integrative Review
Published in Nutrients. Study from 2024.
Source: View full study on PubMed
Effects of Hydrolyzed Collagen as a Dietary Supplement on Fibroblast Activation: A Systematic Review
Published in Nutrients. Study from 2024. Comprehensive analysis combining multiple studies.
Source: View full study on PubMed
The research summaries above are based on published peer-reviewed studies and are provided for informational purposes only. Study findings may not apply to all individuals, and the presence of a study summary does not constitute an endorsement of collagen for any specific health condition. Always consult a qualified healthcare professional before making decisions based on research findings.
Important Information
Having a Productive Conversation with Your Healthcare Provider
One of the most valuable steps you can take before starting a supplement is to discuss it with your doctor, pharmacist, or registered dietitian. Healthcare providers can help you determine whether supplementation is appropriate based on your complete medical history, current medications, and lab results. Blood tests can identify specific nutrient deficiencies that supplementation could address, while also revealing levels that are already adequate and do not require additional supplementation.
When discussing supplements with your provider, bring a list of everything you currently take — including vitamins, minerals, herbal products, and any over-the-counter medications. Ask about potential interactions, appropriate dosing for your situation, and how long you should take a supplement before expecting to see results. Zynava's research summaries and evidence grades can serve as a useful reference during these conversations, giving both you and your provider a shared starting point based on the published scientific literature.
Zynava Does Not Sell Supplements
Zynava is an independent research and comparison platform. We do not manufacture, sell, or distribute any dietary supplements, vitamins, minerals, or health products. Our role is strictly informational — we aggregate peer-reviewed research, analyze supplement labels, and provide tools to help consumers make more informed decisions. When you click a link to a retailer on our site, you are leaving Zynava and purchasing directly from that third-party retailer. We have no control over their inventory, pricing, shipping, or product quality.
Because we do not sell products, our listings are based solely on published research, label transparency, and user feedback — not on profit margins or inventory considerations. This independence is central to our mission of providing unbiased supplement information.
This content is for general educational purposes only and is not intended as medical advice. Consult a healthcare professional before starting any supplement. Individual results may vary. See our full disclaimer and affiliate disclosure.