Collagen
Hydrolyzed protein that supplies building blocks for skin, joints, and connective tissue.
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What it is
Collagen is the main structural protein in skin, tendons, cartilage, and bone. Supplements use hydrolyzed collagen (collagen peptides), broken into small pieces for absorption. Most is sourced from bovine or marine collagen.
How it works
Collagen is the main structural protein in skin, tendons, cartilage, and bone. Supplements use hydrolyzed collagen (collagen peptides) — collagen broken into small fragments that are absorbed and may act as both building blocks and signals that encourage your own cells to make more collagen. Benefits build gradually over weeks to months of consistent use.
What it's been studied for
Taken to support skin elasticity and hydration, and joint comfort.
What the evidence shows
Multiple meta-analyses find collagen supplementation can improve skin elasticity and hydration over several weeks to months, and an updated analysis found it improved symptoms in knee osteoarthritis. Results build gradually with consistent use.
Who should consider it
It's popular with people focused on skin quality (elasticity and hydration) with age, and with those seeking joint comfort. Because collagen is an animal protein low in one essential amino acid, it complements rather than replaces a complete protein. Vegans can't use animal collagen but can support their own with adequate protein and vitamin C.
Amounts commonly studied
Skin studies commonly use around 2.5-10 g of collagen peptides per day; joint studies vary by collagen type.
How to take it
Skin studies commonly use around 2.5-10 g of collagen peptides per day; joint studies vary by collagen type. It's an easy powder to mix into coffee, smoothies, or water, and can be taken any time. Pairing it with vitamin C makes sense, since your body needs vitamin C to build collagen. Give it 8-12 weeks before judging results.
Forms & absorption
Hydrolyzed peptides (types I and III for skin; type II is studied for joints). Often paired with vitamin C, which the body needs to build its own collagen.
Food sources
Bone broth and the skin, connective tissue, and bones of animals provide collagen; gelatin is cooked collagen. Your body also builds its own from protein plus vitamin C, so a protein-adequate diet with plenty of vitamin C supports collagen without a supplement.
Safety & interactions
Very well tolerated. Choose products that are third-party tested, since collagen is an animal-derived product where sourcing and purity matter.
Myths & what it won't do
Myth: eating collagen sends it straight to your skin or joints. Reality: it's digested into amino acids and peptides first — the benefit comes from supplying building blocks and signaling, not from collagen migrating intact. Myth: collagen is a complete protein for muscle. Reality: it's low in some essential amino acids, so it supplements, rather than replaces, quality protein.
Common questions
- Marine or bovine collagen?
- Both work. Marine (fish) collagen is largely type I and absorbs well; bovine provides types I and III. Choose based on preference, diet, and third-party testing.
- Do I need to take it with vitamin C?
- It helps — vitamin C is required for your body to build collagen, so many products combine them or people take them together.
- How long until I see results?
- Skin studies typically show changes after 8-12 weeks of daily use, so consistency and patience matter.
The amounts listed here are what published research has used — not a prescription or a recommended dose for you. Confirm anything you plan to take with your own healthcare provider, especially if you take medications, are pregnant or nursing, or have a health condition.
Related goals
Research on Collagen
Recommendations on this page are informed by published research. This is educational information, not medical advice.
- de Miranda RB, Weimer P, Rossi RC. Effects of hydrolyzed collagen supplementation on skin aging: a systematic review and meta-analysis. Int J Dermatol. 2021;60(12):1449-1461. View study →
- Pu SY, Huang YL, Pu CM, et al. Effects of Oral Collagen for Skin Anti-Aging: A Systematic Review and Meta-Analysis. Nutrients. 2023;15(9):2080. View study →
- Simental-Mendía M, Ortega-Mata D, Acosta-Olivo CA, et al. Effect of collagen supplementation on knee osteoarthritis: an updated systematic review and meta-analysis of randomised controlled trials. Clin Exp Rheumatol. 2025;43(1):126-134. View study →