What is the number one supplement for joints?

Four leaderboards, four winners: what sells, what the register permits, what the trials found, and what the guidelines say

What is the number one supplement for joints is a question with a phrase missing from the middle of it, number one on which leaderboard, and the honest page answers by supplying the phrase and showing all four leaderboards, because they have four different winners and the shelf, which built itself on the first, shows a reader only that one. The sales leaderboard is the one the aisle is arranged by, and it is led by glucosamine, chondroitin and turmeric, the joint supplements that have sold most for decades and that most readers reach for first; what the sales leaderboard does not show is that none of the three holds an authorised health claim for joints or anything else, that the large independent randomised trials of glucosamine and chondroitin in knee osteoarthritis failed to beat placebo on pain or on joint space, with the positive trials clustering among the manufacturer-funded ones, and that the turmeric and curcumin trials are short, small, of mixed quality and shadowed by publication bias, so that the top of the sales leaderboard is held by products whose evidence would not get them onto the other three. The lawful claims leaderboard is the register of authorised health claims, which lists every sentence a product may lawfully print about what a nutrient does, and it is led for joints by vitamin C, which holds the only sentence on the register that mentions cartilage, that it contributes to normal collagen formation for the normal function of cartilage, with manganese beside it for the formation of normal connective tissue and vitamin D for the maintenance of normal bones and normal muscle function, the muscle being what holds a joint; every one of these is a maintenance sentence, permitted because deficiency impairs the function named and sufficiency restores it, and every one is met by a varied diet and, for vitamin D, by the winter habit the national guidance recommends, so that the top of the claims leaderboard costs a satsuma and a 10 microgram tablet from October to March, which is why it is on the best vitamin for joints page rather than on the shelf's display. The trial evidence leaderboard ranks the oral shelf by what randomised trials in people with painful joints actually found, and on it collagen leads, modestly: the questionnaire trials at around 10g of collagen hydrolysate a day for twelve to twenty-four weeks in people with knee pain found a small effect on pain scores against placebo, a point or two on a ten-point scale, with no change in cartilage on the scans that looked, and undenatured type II collagen's small trials at 40mg a day sit behind it with a similar modest result, while the sales leaders sit at or near zero; and the honest page attaches the yardstick that the meta-analyses supply, which is that exercise therapy produces a moderate effect on knee pain in the same literature, larger than any oral supplement's, so that the top of the trial leaderboard is a small effect sitting below a programme. The guideline leaderboard is written by the people who treat joints for a living, and it has no supplement on it at all: every major osteoarthritis guideline puts exercise, quadriceps strength, weight management and continued activity in the first line, with education and pacing beside them, and lists supplements as neither recommended nor prohibited, a shrug in the small print; the top of that leaderboard is not a product but a programme, and the countdown from folklore to the few things with evidence is on the top ten joint supplements page.

Which leaderboard the reader was asking about, how the four fit together for a sore joint, and the trial leader on its true terms

Which leaderboard the reader was asking about decides the answer, and the honest page helps them find out. A reader asking what sells, to know what other people buy, has the first leaderboard and a warning attached to it, since what sells for joints has the weakest evidence on the aisle and the sales rank is a measure of marketing and habit rather than of effect. A reader asking what is lawful, to know what a label may say, has the second, and finds that the claims belong to nutrients they already eat, with vitamin C's cartilage sentence the one that collagen products borrow by including 12mg of vitamin C, which is why the worked example's label carries that sentence and not one about collagen. A reader asking what works, to know what a trial found, has the third, and finds collagen at the top with a small effect at a powder dose and the sales leaders at the bottom, which is a useful reordering of the aisle and still an answer measured in a point or two on a questionnaire. And a reader asking because a joint hurts, which is most readers, wants the fourth, and the fourth has no supplement on it, because the thing that produces a moderate effect on joint pain, protects the cartilage that remains and cuts the injuries that make joints worse is a programme: quadriceps and hip strengthening two or three times a week, moderate cyclic load through walking and cycling, body weight brought down for the knee's four kilograms per kilogram, and the balance and technique work that the injury prevention trials used, with the five checkout questions for a knee on the knee supplement page putting the assessment and the strength before any purchase. The four fit together for a sore joint in an order the honest page gives plainly: the fourth leaderboard first, because it is the treatment; the second as the floor, since a varied diet and a winter vitamin D habit supply every lawful joint sentence for pennies; the third as an adjunct, if the reader wants one, bought at the trial dose with the trial's expectation, a point or two over months and nothing structural; and the first as the thing to walk past, since a sales rank bought a shelf position and not a result. The number one supplement for joints, read that way, is a programme with a satsuma, and the number one product is a powder collagen at 10g with a small effect, which a reader may buy knowing exactly what it bought in the trials. The worked example is the trial-evidence 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 questionnaires moved, carrying vitamin C's collagen formation sentence for the normal function of cartilage, which is the second leaderboard's winner riding on the third's, and no joint claim of its own, since the register permits none for collagen. What is the number one supplement for joints: on four leaderboards, glucosamine, vitamin C, collagen and nothing, and the reader with a sore joint wants the leaderboard with nothing on it.

What to check on the label