Joint Supplements: What the Evidence Says

First, get the diagnosis

Joint pain has many causes: osteoarthritis (wear and tear), rheumatoid arthritis and other inflammatory arthritis, gout, bone loss and fractures, nerve and muscle problems, bursitis, injury, and referred pain from the spine. Treatments differ completely. Inflammatory arthritis, for example, needs disease-modifying medicines, not supplements. See arthritis at home: a complete guide for older adults and families, osteoarthritis or rheumatoid arthritis: telling them apart and caring for each and knee osteoarthritis home care. Sudden severe joint pain with redness, heat and swelling, fever, or inability to move the joint is an emergency: seek urgent medical care.

What the evidence says

### Glucosamine

A natural compound in cartilage, sold as sulphate or hydrochloride, usually from shellfish or fermented corn. Large trials and meta-analyses have produced mixed results: some older studies suggested modest pain relief, but better-designed trials found little or no benefit over placebo for knee osteoarthritis. The UK's NICE guideline on osteoarthritis advises against offering glucosamine, because evidence of clinical benefit is lacking. Some people say they feel better, and a trial of a few months at a label dose is not likely to cause harm for most, but if there is no benefit, stop. Cautions: possible interaction with warfarin (increased INR and bleeding risk); possible effect on blood sugar in people with diabetes (evidence mixed, but monitor); shellfish allergy with shellfish-derived products; asthma; high cholesterol or blood pressure in some reports. Ask the doctor and pharmacist.

### Chondroitin

Another component of cartilage, often combined with glucosamine. Evidence is similar: small and inconsistent benefit for pain, less than the best-quality studies, and not recommended in most guidelines. May have a mild blood-thinning effect; caution with anticoagulants.

### Turmeric and curcumin

Widely used in Indian cooking and medicine. Laboratory studies show anti-inflammatory effects, and some small trials of curcumin extracts suggest modest pain relief in knee osteoarthritis, comparable to some painkillers in short-term studies, but trials are small, short and often of variable quality, and the active compound is poorly absorbed, so products add black pepper (piperine) or special formulations that raise absorption, and also raise the risk of interactions. Cautions: curcumin may increase bleeding risk with blood thinners; can lower blood sugar; may irritate the stomach, cause gallstone problems or affect the liver (rare cases of liver injury have been reported with highly concentrated products); piperine can change blood levels of many medicines. Using turmeric as a spice in cooking is safe and healthy for most; concentrated supplements need medical advice. See supplements and medicine interactions: a safety guide.

### Collagen peptides and gelatin

Hydrolysed collagen is promoted for joints and skin. Some small trials report modest benefit for joint pain; evidence is limited, with possible bias, and the digestive system breaks collagen into amino acids like other proteins. Collagen is a protein source of low quality (lacking some essential amino acids), so it should not replace protein foods; see how much protein do older adults need. Generally well tolerated; check the source (bovine, marine) for allergy and dietary preference.

### Omega-3 fish oil

May help pain and stiffness in rheumatoid arthritis at higher doses, as an addition to prescribed treatment, and has little proven benefit for osteoarthritis. See omega-3 supplements for seniors: evidence and cautions; bleeding risk with blood thinners.

### MSM (methylsulfonylmethane) and SAMe

MSM has small trials with mixed results; SAMe has shown some benefit comparable to anti-inflammatory drugs in some studies but is expensive, unstable and interacts with antidepressants. Both lack strong evidence; ask the doctor.

### Boswellia (shallaki) and other herbs

Boswellia serrata extract has traditional use in Ayurveda and some small trials suggest benefit for osteoarthritis pain; quality and standardisation vary and evidence is limited. Ginger, willow bark, devil's claw, cat's claw and others have limited data and potential interactions (willow bark contains salicylates). Herbal products may contain contaminants or undeclared drugs; see spotting fake or poor-quality care products.

### Vitamin D and calcium

Not treatments for arthritis, but important for bone health; see calcium and vitamin D after 60: doses, food and sun. Deficiency can cause bone and muscle pain mistaken for arthritis; see vitamin D deficiency in India.

### Others

Avocado-soybean unsaponifiables, diacerein (a prescription medicine in some countries), hyaluronic acid tablets, eggshell membrane, green-lipped mussel, cartilage extracts and "joint blends" generally have limited or inconsistent evidence.

Why people feel better

Pain from osteoarthritis fluctuates naturally, and people usually start supplements when pain is at its worst; improvement may follow by chance. Expectation also reduces pain (the placebo effect is large in osteoarthritis trials). That does not make the relief imaginary, but it explains why trials and experience differ. If a supplement seems to help and is safe, some people choose to continue, but they should set a time limit (for example, three months), assess honestly, and stop if there is no benefit.

Safety and interactions

• Warfarin and other anticoagulants or antiplatelets: glucosamine, chondroitin, turmeric, fish oil, ginkgo, garlic and ginger may affect bleeding or INR. Always tell the doctor; see atrial fibrillation and blood thinners: a family guide.
• Diabetes: some supplements and herbs affect blood sugar; monitor; see eating for diabetes after 60.
• Kidney or liver disease: many herbal and mineral products are unsuitable; some Ayurvedic preparations contain heavy metals; see eating with chronic kidney disease: a family guide.
• Shellfish allergy, asthma: check sources.
• Stomach problems and ulcers: turmeric, boswellia and some others can irritate; see acidity and reflux in older adults.
• Before surgery: stop or continue as the surgeon advises; tell them about all supplements.
• Multiple supplements: avoid stacking several joint products that duplicate ingredients; see polypharmacy and deprescribing.
• Do not stop prescribed medicines, such as anti-inflammatories, disease-modifying drugs, osteoporosis treatment or heart tablets, in favour of supplements.
• Costs: supplements can be expensive over months; compare with proven measures; see care costs in India: budgeting.

Using a joint supplement sensibly, if you do

1. See a doctor first for a diagnosis and a medicine and allergy check. 2. Choose one product, from a reputable maker, with a clear ingredient list and doses per serving, a licence number and batch details; see how to read a supplement label. 3. Use the label dose, and no more. 4. Set a trial period, such as three months, and a pain and function diary (walking distance, stairs, stiffness in the morning, painkiller use). 5. Stop if there is no improvement, or if side effects occur: stomach upset, rash, bleeding, bruising, headache, dizziness. 6. Tell all doctors and the pharmacist about the supplement. 7. Do not combine with several others. 8. Keep up the proven measures below.

What works better

Evidence-based approaches for osteoarthritis and joint pain, in order of importance:

• Exercise: strengthening the muscles around the joint (especially quadriceps for the knee), aerobic activity, balance and flexibility work, including walking, cycling, water exercise and chair exercises. See exercises for knee and hip pain, exercise with arthritis and chair exercises for seniors.
• Weight management: each kilogram lost reduces load on the knees several-fold; see weighing scales and unplanned weight loss in older adults for a caution about unplanned loss, and ask a dietician for safe weight reduction in those who are overweight.
• Pain relief: paracetamol, topical anti-inflammatory gels, and, where suitable, oral anti-inflammatory medicines at the lowest dose for the shortest time as advised, with caution in kidney disease, heart disease, stomach ulcers and with blood thinners; see painkillers and older adults and pain diary and talking to your doctor.
• Heat and cold: safe use of hot packs and cold packs; see heat or cold for joint pain and hot pack safety for older skin.
• Supports and aids: a walking stick, knee supports where advised, suitable footwear and insoles; see knee support buying guide and choosing shoes for older feet.
• Physiotherapy and occupational therapy.
• Injections or surgery for suitable cases, decided by an orthopaedic specialist; see knee replacement recovery equipment.
• A healthy diet: plenty of vegetables, fruit, whole grains, pulses, nuts, oily fish and spices such as turmeric used in cooking, and limited processed and fried foods; see balanced diet chart plan for elderly people.
• Good sleep and mood care.

Red flags

Seek medical advice promptly for a hot, red, swollen joint; fever with joint pain; sudden inability to bear weight; severe night pain; joint pain with weight loss or unexplained tiredness; new numbness or weakness; or pain after a fall. Call 112 for chest pain, breathlessness, weakness on one side or severe injury.

When to ask a professional

Ask a doctor for a diagnosis and a treatment plan, and ask whether any supplement is reasonable for your parent. Ask a physiotherapist for a strengthening programme. Ask a pharmacist about interactions and product quality. Ask a dietician about weight and anti-inflammatory eating patterns. Seek urgent help for hot swollen joints with fever or sudden severe pain.