Joint Supplements

Do joint supplements work?

The evidence is weak for most of them. The NHS says GPs no longer prescribe chondroitin and glucosamine on the NHS, that there's no strong evidence they're effective, and that NICE recommends they should not routinely be offered on the NHS.

The NHS says exercise is one of the most important treatments for osteoarthritis, and that losing weight helps if you're overweight. If you have joint pain, swelling or stiffness, see your GP rather than starting with a supplement. "Where evidence is limited or inconclusive, we should say so openly," says Andy Arshad, who runs SupplementHQ.

What is glucosamine?

Glucosamine is an amino sugar. The charity Versus Arthritis says it is made from shellfish or prepared in the laboratory, and is sold as glucosamine sulphate or glucosamine hydrochloride.

Versus Arthritis says the results for osteoarthritis are mixed and the size of any effect is modest, and that most trials used 500mg three times a day (1,500mg a day). This collection includes glucosamine-only products, vegan glucosamine made without shellfish, and combinations with chondroitin and MSM. N-acetyl glucosamine (N-A-G) is a related but different form.

Glucosamine or chondroitin: which is better?

Neither has been shown to be clearly better, and neither has an authorised health claim. Chondroitin is usually taken from animal cartilage, which is why shark cartilage products sit in this collection too.

In one large trial described by Versus Arthritis, people taking glucosamine hydrochloride or chondroitin sulphate didn't report a significant improvement compared with a placebo. If you choose a combined product, compare the amount of each ingredient, because some blends contain small doses of several things.

What can joint supplements legally claim?

Only nutrient claims that are authorised, with their conditions met. For joints, the most relevant is "Vitamin C contributes to normal collagen formation for the normal function of cartilage", which may be used only for a food that is at least a source of vitamin C (wording from the authorised claims list).

Manganese also has a claim, "Manganese contributes to the normal formation of connective tissue" (GB claims register). There are no authorised claims for glucosamine, chondroitin, MSM, collagen, hyaluronic acid or turmeric, so when a product's name says "joint", that's the brand's name, not a claim we make.

What is MSM?

MSM (methylsulfonylmethane) is a sulphur compound sold as powder, capsules and tablets, and it's one of the most common ingredients in this collection. It has no authorised health claim.

Some MSM products add vitamin C. Where they contain at least a source of vitamin C, the cartilage claim above applies to the vitamin C, not to the MSM. The NHS says taking more than 1,000mg of vitamin C a day can cause stomach pain, diarrhoea and wind, so add up vitamin C across everything you take.

Is collagen good for joints?

There is no authorised claim that collagen supports joints, and the evidence is still developing. This collection includes collagen powders, type II collagen and sport collagen blends; see also collagen for joints.

"Collagen products can look very similar on the shelf but differ significantly in formulation, quality, sourcing and the amount of collagen customers actually receive," says Andy. Compare the grams of collagen per serving and whether vitamin C is added.

Are joint supplements safe?

Check for allergens first. Crustaceans, fish and molluscs are among the 14 allergens that must be emphasised on labels, and Versus Arthritis says if you're allergic to shellfish, you should take the shellfish-free variety of glucosamine.

Versus Arthritis also advises caution with glucosamine if you have diabetes, as it might increase blood sugar. Speak to your GP or pharmacist before taking a joint supplement if you take medication, including blood thinners, have a medical condition, or are pregnant or breastfeeding. The creams, gels and sprays here are for use on the skin, so follow their labels.

How to compare joint supplements on value

Compare the cost per day of the dose you'd actually take, and the amount of each main ingredient in that dose.

How to compare value (example figures, not real products): a £12 pot of 120 tablets with 500mg of glucosamine each, three a day for 1,500mg, lasts 40 days, so 30p a day. A £20 pot of 90 capsules with 250mg of glucosamine and several other ingredients needs six a day for 1,500mg, so it lasts 15 days and costs about £1.33 a day.

"Adding more ingredients doesn't automatically make a product more effective. Each ingredient needs a clear purpose, an appropriate dose and evidence supporting its intended use," says Andy. Go back to all vitamins and supplements, or read our guide to reading a supplement label.

We sell the products on this page. That's our commercial interest, and it's why we show the evidence alongside them. This page is general information for adults, not personalised medical advice. Food supplements should not replace a varied, balanced diet.

Written by Andy Arshad, SupplementHQ. Last reviewed 11 October 2026.