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Green-lipped mussel oil has a loyal following and mixed evidence. These are the questions our naturopaths ask in store before you start a three-month trial of it.

A good fit if

• You have mild, everyday joint discomfort and your doctor has checked what's behind it
• You're already working on exercise, strength and weight. Healthdirect puts those first, and no supplement replaces them
• You'd like a very small capsule rather than a large fish oil softgel
• You're happy to give it the 12 weeks the trials ran, and to stop if nothing changes
• You eat seafood without any trouble and have never reacted to shellfish

Check with us first if

• You take warfarin or another blood thinner or antiplatelet medicine. Marine oils are routinely checked alongside blood thinners, and the evidence for this extract specifically is thin rather than reassuring.
• Your joint pain is new, severe, hot or swollen, or came on suddenly. That needs a diagnosis first, not a supplement.
• You have gout. Whole-mussel powders are shellfish taken by the gram, which is quite different from the oil, so check which product you have.
• You already take fish oil, krill oil or another marine supplement. Think about what you want each one to do rather than stacking them out of habit.
• You have asthma or several food sensitivities. With seafood-based products, start with a cautious first dose and talk to us first.
• You take any prescription medicine. A quick check with your doctor, pharmacist or our naturopaths first is the sensible move.

• Green-lipped mussel oil (lipid extract), Schedule 1 item 2454. Best known for: The concentrated part of the mussel, and the form most joint research used. Absorption: A marine oil in a small softgel; best taken with food, like any oil. Typical use: 50 mg capsules, one or several a day. The trial dose was 400 mg a day for 12 weeks, then a lower ongoing dose.
• Freeze-dried whole green-lipped mussel powder, items 2452 and 2453. Best known for: The whole mussel, including its protein and glycosaminoglycans, not just the oil. Absorption: Taken in grams; a 500 mg capsule of powder holds only a fraction of the oil in a 50 mg extract capsule. Typical use: Capsules at 2 to 6 a day; this is the form used in the most recent placebo-controlled joint trial, at 3 g a day.
• Fish oil. Best known for: Giving you EPA and DHA in doses of hundreds of milligrams. Absorption: Natural or re-esterified triglyceride, or ethyl ester in concentrates. Typical use: For when you want omega-3s rather than a joint-specific product. It can't replace mussel oil, or the other way around.
• Glucosamine and chondroitin. Best known for: The long-standing joint option, and the comparison most people are really making. Absorption: Tablets or powders taken in gram doses. Typical use: Often the first thing people try for joint comfort; mussel oil is usually the second, and the two are quite different ingredients.

Reference values. There's no Nutrient Reference Value. Green-lipped mussel oil isn't a nutrient your body needs, so there's no RDI, no Adequate Intake and no deficiency. That's what sets it apart from the vitamins on the shelf next to it.

Typical supplemental range. Australian capsules usually contain 50 mg of oil extract. The best-known clinical trial used 400 mg a day, taken as eight capsules, for 12 weeks. Product labels follow that by starting high and reducing after about eight weeks. Whole-mussel powder products are on a different scale entirely, at 1 to 3 g a day.

Upper level. No upper limit has been set, and Australia's permitted ingredients list (Schedule 1) places no dose cap on it. That simply means no limit has been assessed. It doesn't prove it's safe at any dose.

Worth knowing. Trials ran for 12 weeks, so a fortnight won't tell you either way. What you need depends on your age, diet and health, so talk to one of our naturopaths.

Food first, where the diet allows it.

• Green-lipped (greenshell) mussels, steamed: the whole food the extract comes from, supplying protein and minerals as well as oil. Eating mussels is not a route to an extract dose: the oil is a concentrate of a small lipid fraction
• Oysters, cooked: about 0.30 g EPA and 0.23 g DHA per 85 g serve
• Sardines, canned in tomato sauce and drained: about 0.45 g EPA and 0.74 g DHA per 85 g serve
• Herring, cooked: about 0.77 g EPA and 0.94 g DHA per 85 g serve

If any of these sound like you, talk to one of our naturopaths or your doctor before you start.

• You're allergic to shellfish, molluscs or seafood. Don't take it. Australian labels must declare mollusc content, and these products state they're not suitable for people with seafood or shellfish allergies.
• You notice signs of an allergic reaction (hives, swelling of the face or throat, wheezing, trouble breathing). This is an emergency; call 000.
• You're pregnant or breastfeeding. Labels in this category advise against use or ask you to get professional advice first.
• It's for a child. Safety isn't established; the trials were in adults and labels are written for adults.
• You take warfarin, other blood thinners or antiplatelet medicines. Marine oil products are routinely flagged for review, though specific evidence for this extract is thin.
• You have new, severe, hot or suddenly swollen joints. That needs a medical check, not a supplement.
• You have asthma or several food sensitivities. Take care with seafood-based products the first time you use them.
• You have gout. Whole-mussel powder is a shellfish taken in gram doses, so check which product you have.
• Stomach upset and nausea are the most commonly reported effects of marine oil products.
• You're adding it to fish oil, krill oil or other marine supplements without a clear reason. Decide what each one is for.
• Don't use it to replace a prescribed medicine; that's a decision for your prescriber.
• If you take prescription medicines, check with your doctor, pharmacist or our naturopaths before you start.