Supplements — collagen

Supplements — collagen: this page covers what people in the UK most often ask about supplements — collagen. Written in plain English and reviewed by a First Contact Practitioner (HCPC PH128483).

Clinically reviewed · Louis Maxwell, HCPC PH128483 · 16 September 2026

Educational information for people in the UK living with arthritis — not a diagnosis or personal medical advice. Check medicines and exercises with your GP, pharmacist or rheumatology team. For emergencies call 999; for urgent advice use NHS 111. See our medical disclaimer, editorial standards and claims policy.

Checked on 10 October 2026 against Arthritis UK's collagen page, NICE NG226 and the published trials listed below. This page is general education, not a recommendation to buy any product.

What collagen is

Collagen is a protein found throughout your body. It gives structure and strength to cartilage, bone, tendons, ligaments and skin. Your body makes its own collagen from the protein you eat, and it needs vitamin C to do this. The NHS lists "maintaining healthy skin, blood vessels, bones and cartilage" among the jobs vitamin C does.

As we get older, the body makes less collagen. That is the main reason researchers, and supplement companies, have looked at whether taking collagen by mouth could help joints.

The types of collagen supplement

Collagen supplements are always made from animal or fish sources. Products vary a lot, and research on one type does not automatically apply to another. The two main forms are:

Form	What it is	Usual source
Hydrolysed collagen (collagen peptides, collagen hydrolysate)	Collagen broken down into small pieces so it dissolves in drinks and is easier to digest. Mostly types I and III.	Cow hides and bones (bovine), pig skin or fish skin and scales (marine)
Undenatured type II collagen (often sold as UC-II)	Collagen kept in its natural structure. Type II is the main collagen in cartilage. It is thought to work by influencing the immune system rather than by supplying building blocks.	Chicken breastbone cartilage

You will also see "plant-based collagen" or "vegan collagen". Arthritis UK points out this is not real collagen: it contains ingredients meant to help the body make its own, and there is much less research on it.

What the evidence shows

The honest summary: some trials suggest collagen may slightly improve pain or stiffness for some people with osteoarthritis, but results are inconsistent, products and doses differ, and many studies are small or industry-funded. There is no good evidence that collagen rebuilds damaged cartilage. The NHS does not recommend collagen for arthritis, and NICE does not include it in its osteoarthritis treatments.

Osteoarthritis

Arthritis UK says studies suggest collagen may reduce pain or improve movement for some people, particularly with osteoarthritis, but studies have not all found the same results and there is not enough evidence to recommend it as a routine treatment.
A 2026 umbrella review (Ravindran and colleagues) pooled 16 systematic reviews covering 113 trials and almost 8,000 participants on skin and musculoskeletal outcomes. It found some evidence of benefit for osteoarthritis symptoms, but the trials used different types and doses of collagen and measured results in different ways, so firm conclusions are difficult.
A 2019 meta-analysis (García-Coronado and colleagues, International Orthopaedics) of placebo-controlled trials found collagen reduced overall osteoarthritis symptom scores and pain on a visual scale. However, when the symptom score was split into parts, only stiffness improved significantly; the pain and function sub-scores did not.
A 2016 trial of undenatured type II collagen (Lugo and colleagues, Nutrition Journal) gave 191 people with knee osteoarthritis either 40 mg a day of UC-II, glucosamine plus chondroitin, or placebo for 180 days. The UC-II group did better than both other groups. Two of the authors worked for the company that made the supplement, which is important to know when weighing the result.

Rheumatoid arthritis

Arthritis UK says studies of collagen for rheumatoid arthritis have had mixed results. Some found fewer swollen or tender joints and others found little or no benefit. In one trial that compared type II collagen with methotrexate, both groups improved, but the methotrexate group improved most. Overall, the results are not consistent enough to support collagen as a treatment for RA. Collagen should never be used instead of disease-modifying medicines.

What NICE says

NICE's osteoarthritis guideline, NG226, does not recommend collagen. Its core treatments are therapeutic exercise, weight management where appropriate, and information and support. It specifically says not to offer glucosamine, explaining there is "no strong evidence of benefit". For rheumatoid arthritis, NICE NG100 says complementary therapies may give some people short-term symptom relief, but there is little or no evidence of long-term benefit.

Why the evidence is so uncertain

Different products. Hydrolysed peptides and undenatured type II collagen are very different, yet they are often grouped together in reviews.
Different doses and lengths. Trials have used very different amounts for different lengths of time.
Small studies. Many trials have small numbers of people, which makes chance results more likely.
Industry funding. Several trials were funded or run by supplement manufacturers. That does not make the results wrong, but independent studies are needed.
Osteoarthritis pain naturally varies. Symptoms go up and down, and people in trials often improve on placebo too, so a good placebo-controlled design matters.

Can you get collagen from food?

You do not need to eat collagen to make collagen. Your body builds it from amino acids, which come from any protein in your diet, and it needs vitamin C. Most adults aged 19 to 64 need 40mg of vitamin C a day, and the NHS says you should be able to get all you need from your diet.

Foods that support your body's own collagen production include:

Protein foods: fish, eggs, chicken, dairy, beans, lentils, tofu and nuts. Our protein guide explains how much you need and how to spread it through the day.
Vitamin C foods: oranges, berries, kiwi fruit, peppers, broccoli, Brussels sprouts and potatoes.
Foods containing collagen itself: bone broth, chicken skin, fish skin and gelatine. These contain collagen in unpredictable amounts, so they are not the same as the products used in trials.

A varied, balanced diet based on the NHS Eatwell Guide covers these naturally. Taking large amounts of vitamin C, more than 1,000mg a day, can cause stomach pain, diarrhoea and wind, and will not boost collagen further.

Is collagen safe?

Arthritis UK says studies suggest collagen supplements are safe for most people and serious side effects are uncommon. Reported side effects tend to be mild, such as feeling full or bloated, mild indigestion or an unpleasant taste.

Collagen may not be suitable if:

you have a fish or shellfish allergy (marine collagen) or an egg allergy (some products contain eggshell membrane)
you are vegetarian or vegan, or avoid certain animal products for religious reasons. Check the source on the label
you have been told to limit your protein, for example because of kidney disease. Collagen powders add protein, so ask your kidney team or dietitian first
you are pregnant or breastfeeding, as there is little research in these groups

Medicines and interactions

Arthritis UK says there are no well-known interactions between collagen and arthritis medicines. The bigger risk is what else is in the product. Many "joint formula" supplements combine collagen with other ingredients, and some of those do matter:

Warfarin and other anticoagulants: combination products may contain turmeric (curcumin) or fish oil, which may increase the risk of bleeding with blood thinners. The NHS also advises telling your doctor about any vitamins or supplements before taking warfarin and not taking vitamin K supplements. See our turmeric evidence guide for more on this.
Methotrexate: the NHS says not to take vitamin or mineral supplements that contain folic acid (folate) if you already take folic acid prescribed by your doctor, and not to take folic acid on the same day as methotrexate. Some "joint and skin" collagen blends contain added vitamins, so check the label. Turmeric products have also been linked with liver problems, and methotrexate can affect the liver.
NSAIDs such as ibuprofen and naproxen: Arthritis UK advises people taking anti-inflammatory painkillers to get medical advice before using fish oil, because it can increase the risk of bleeding. NSAIDs can already cause stomach bleeding on their own.
Glucosamine: often added to joint products. NICE does not recommend it for osteoarthritis. Ask a pharmacist before taking it with any blood thinner.

Before you start any supplement, ask your community pharmacist to check the full ingredients list against everything you take, including over-the-counter medicines.

If you decide to try collagen

Collagen is not available on NHS prescription, so any trial is at your own cost. Food supplements are regulated as foods in the UK, not as medicines, which means they are not tested for effectiveness before they go on sale. If you choose to try it:

Talk to your GP, rheumatology team or pharmacist first, especially if you take any regular medicines.
Choose a single-ingredient product so you know what you are taking and can tell whether it helps.
Check the label for the collagen type and source, the amount per serving, other ingredients, and allergy information.
Be wary of big claims. Supplements cannot legally claim to treat, prevent or cure a disease. Words like "rebuilds cartilage" or "cures joint pain" are a red flag.
Start one thing at a time. If you start collagen, a new exercise programme and a new medicine in the same week, you will not know what made the difference.
Set a time limit and keep a record. Arthritis UK notes that most studies followed people for several months. Score your pain, stiffness and function from 0 to 10 each week. If you notice no difference after about 3 months, it is reasonable to stop and spend the money elsewhere.
Keep taking your prescribed treatment. Collagen must not replace medicines, exercise or other treatment.

What has stronger evidence for joint pain

If your aim is less pain and better movement, these have more support from NICE than any supplement:

Therapeutic exercise, including muscle strengthening and general aerobic activity, tailored to you. This is a core NICE treatment for osteoarthritis.
Weight management if you are living with overweight or obesity. NICE says any amount of weight loss is likely to help.
Effective treatment for inflammatory arthritis, such as disease-modifying medicines for rheumatoid arthritis, started early and reviewed regularly.
A balanced, Mediterranean-style diet with enough protein, oily fish, fruit and vegetables.

For a wider look at which nutrition claims hold up, see our arthritis diet myths checked, and compare collagen with other options on our glucosamine page.

Questions to ask a pharmacist

Is this product safe with all the medicines I take?
Does it contain anything else, such as turmeric, fish oil, glucosamine, vitamin K or folic acid?
Is it suitable with my allergies or other health conditions?
How should I take it, and what side effects should I look out for?
When should I stop if I do not notice any benefit?

When to get medical help

Speak to your GP, rheumatology team or call NHS 111 if:

you have a hot, red, swollen joint, especially if you feel feverish or unwell. Call 999 or go to A&E if you feel very unwell
your joint pain, swelling or stiffness is getting worse despite treatment
you get a rash, swelling of the lips or face, or difficulty breathing after taking a supplement. This could be an allergic reaction and needs urgent help: call 999 if breathing is affected
you notice yellowing of the skin or eyes, dark urine or unusual tiredness while taking a combination joint supplement, especially if it contains turmeric
you take warfarin or another blood thinner and notice unusual bruising or bleeding
you have kidney disease and want to know whether extra protein is safe for you

Take the supplement packaging with you so the clinician can see exactly what you have been taking.

Sources and further reading

Frequently asked questions

This is general information, not a substitute for personalised medical advice.