What is the most effective joint supplement on the market?

Effective is a number: the effect-size ruler, the yardstick of exercise on it, and where each joint supplement falls

What is the most effective joint supplement on the market is a question that uses the word effective as an adjective, meaning good or strong or worth buying, and the honest page answers it by taking the word literally, because in a randomised trial effective is not an adjective but a number, the effect size, which measures how much better the treated group did than the placebo group in units that let one treatment be compared with another, and the osteoarthritis literature has measured that number for everything on the joint shelf and, more usefully, for the thing that is not on it. The ruler runs from zero, which means no better than placebo, through small, which in a pain trial means a point or two on a ten-point scale that a patient may or may not notice, through moderate, which a patient notices, to large, which is rare in any chronic pain condition. The yardstick on the ruler is exercise therapy, because it has been tested in more trials than any supplement and because the meta-analyses that rank joint treatments include it: structured exercise, strengthening the quadriceps and hips, aerobic activity and neuromuscular training, produces a moderate effect on knee pain against no-exercise controls, consistently across the meta-analyses, with the effect holding as long as the exercise continues and fading when it stops, and weight loss adds a dose-dependent benefit for the knee, more weight lost meaning more pain relieved, through the four kilograms of knee load that each kilogram of body weight carries. Against that yardstick the shelf lines up, and the honest page gives the line in order. Collagen hydrolysate, at around 10g a day for twelve to twenty-four weeks in people with knee pain, produces a small effect on pain scores against placebo, a point or two, consistent across the trials that have measured it, which is more than can be said for most of the shelf, with no change in cartilage on the imaging that has looked, and the effect sitting clearly below exercise's. Undenatured type II collagen at 40mg a day produces a small effect in small trials, with the same caveats and fewer trials. Curcumin, the turmeric extract, and the other herbal extracts, boswellia above all, produce small to moderate short-term effects in trials that are short, small and of mixed quality, with the funnel plots that detect publication bias showing the asymmetry that appears when many small positive trials are published and the large neutral ones are not, so that the honest reading of the herbal effect sizes is that they shrink as the trial quality rises and that the true effect is probably small. Glucosamine and chondroitin, the bestsellers of the aisle for decades, produce effects near zero in the large, independent, publicly funded trials in knee osteoarthritis, on pain and on joint space alike, with the positive results clustered among the manufacturer-funded trials, which is the pattern that the effect-size literature has learned to read as a product effect rather than a treatment effect. Fish oil, vitamin D in people who are not deficient, MSM, hyaluronic acid taken by mouth and the rest sit at or near zero for joint pain, with the aisle walked product by product against the register on the joint supplements review page.

What the ruler says the most effective supplement is, what it says the most effective thing is, how to buy the small effect honestly, and the worked example

What the ruler says the most effective joint supplement on the market is depends on one judgement the reader has to make, which is how much weight to give to trial quality, and the honest page lays out both answers. A reader who takes the published effect sizes at face value finds curcumin at the top, with small to moderate effects in the short trials, and collagen just behind it with a small effect; a reader who weights the effect sizes by the quality of the trials that produced them, discounting the short, small, manufacturer-funded and bias-shadowed, finds collagen at the top, with its small effect the most consistent and least shrinking of the shelf's, and curcumin behind it with an effect that may be real and is probably smaller than it looks. Either way the most effective joint supplement on the market has a small effect, a point or two on a ten-point pain scale over months, with nothing structural on any scan, and either way it sits below the yardstick, which is the finding that matters: the most effective thing for a joint, by the only ruler that measures effectiveness, is not on the market at all, because it is a programme of exercise and weight management that produces a moderate effect, holds as long as it is kept up, protects the cartilage that remains and cuts the injuries that make joints worse, and that no shop sells and no guideline leaves out. The four leaderboards on which the same question has four winners, sales, lawful claims, trial evidence and guideline position, are on the number one supplement for joints page, and the effect-size ruler is the instrument that orders the third of them and explains why the fourth has no supplement on it. How to buy the small effect honestly, for the reader who wants it beside the programme, is a short list: collagen hydrolysate as a plain powder at around 10g a day, the dose the trials used, since a capsule at a tenth of the dose has borrowed the trial and not reproduced it; a written pain score out of ten on one movement before the first scoop, so that a point or two is seen if it comes and not imagined; twelve to twenty-four weeks before judging, which is when the questionnaires moved; and the expectation set at the trial's size, which is small, with the three-test scorecard that runs lawful sentence, trial and dose across both joints and tendons on the joints and tendons supplement page. A reader who prefers curcumin buys it knowing the trials are short and the bias is visible, and a reader who buys glucosamine buys the sales leaderboard. What a reader should not do is let the small effect replace the moderate one, which is the aisle's quiet suggestion and the commonest mistake a sore knee makes: the tub is the adjunct and the programme is the treatment, and a reader who has the first and not the second has bought a point or two and left the rest on the table. The worked example is the small-effect leader at habit scale, stated on its true terms: two capsules, 1200mg hydrolysed type 1 marine collagen with 12mg vitamin C at 15% of its reference value plus zinc, 120 for £16.99 at 28p a day, lab tested and UK made, below the 10g dose at which the small effect was measured, so that the honest expectation at this dose is smaller than small or nothing, carrying vitamin C's collagen formation sentence for the normal function of cartilage and no joint claim of its own, since the register permits none for collagen and the effect-size ruler is not a claim. What is the most effective joint supplement on the market: collagen or curcumin, both small, both below exercise, and the most effective thing for a joint is a programme no market sells.

What to check on the label