What vitamins make your joints stronger?

The verb audit: what the register lets a vitamin say about a joint, why strengthen is not among the permitted verbs, and what the question becomes

What vitamins make your joints stronger is a question whose verb fails an audit, and the honest page runs the audit before it answers, because the verb is exactly where the shelf misleads and a reader who knows which verbs are lawful reads every joint label differently afterwards. The register of authorised health claims is the list, maintained for Great Britain, of every sentence a food or supplement may lawfully print about what a nutrient does in the body, each one examined by a scientific panel before it was permitted, and its grammar is strict. The permitted verbs for vitamins are contributes to the maintenance of, as in vitamin D contributes to the maintenance of normal bones; contributes to normal, as in vitamin D contributes to normal muscle function and vitamin C contributes to normal collagen formation for the normal function of cartilage and bones; and, for the minerals, contributes to the maintenance of normal connective tissues for copper and to the normal formation of connective tissue for manganese. The verbs that do not appear anywhere in the register for any vitamin are strengthen, build, improve, boost, repair, regenerate and protect, and their absence is not an oversight but the finding: a claim is authorised when the evidence shows that deficiency of the nutrient impairs the function named and that sufficiency restores it, which establishes a maintenance relationship, a floor beneath which the function fails and above which it runs normally, and says nothing at all about more than sufficiency doing more. A vitamin that strengthened a joint beyond its normal state would need a randomised trial in sufficient people showing the joint stronger, by a measurement, after the vitamin than after placebo, and no vitamin has one, which is why no vitamin may use the verb and why a label that says a vitamin strengthens joints has stepped outside the law as well as the evidence. The audit also catches the minerals and the proteins: copper and manganese maintain and form connective tissue, they do not strengthen it, and collagen holds no joint sentence of any kind, so that a collagen label's joint language is either vitamin C's borrowed sentence or unlawful. So the question has to be translated before it can be answered, and the translation is what vitamins maintain a joint, which the register answers directly, as the sorting by tissue and by take against eat on the vitamins to strengthen joints page lays out: vitamin D for the bone and the muscle, vitamin C for the collagen that cartilage and bone are built on, vitamin K for the bone, each to the point of sufficiency and not beyond it, since each works as a cofactor for enzymes that saturate, and copper and manganese, which are minerals, for the connective tissue of ligament, tendon and capsule, to which no vitamin is attached at all. That is the lawful answer to the lawful question, and it is a shopping list with one winter tablet on it rather than a strengthening programme in a capsule.

The thing that holds the strengthening verb in the trials, the one vitamin attached to it, what a reader takes and does, and the worked example

The strengthening verb is not absent from the evidence, only from the vitamin shelf, and the honest page gives it to the thing that holds it in the trials, because the reader's question was a real one and deserves the real answer. In the randomised and cluster-randomised injury prevention trials, which assigned whole teams to a programme or to their usual warm-up and counted injuries through a season, structured programmes of strength, balance, jumping and landing technique cut knee and ankle injuries by around a third to a half, strength training alone cut sports injuries by around a third and overuse injuries by nearly half in the meta-analysis of the field, and proprioceptive training cut recurrent ankle sprains, which is what a stronger joint means to the person asking, a joint that does not get hurt; and in none of those trials, in any sport or population, was a vitamin the intervention. The muscle around a joint holds the strengthening verb because it does the strengthening work: it provides most of a joint's stability, absorbs the load of each step and landing before it reaches the ligaments and the joint surface, and adapts in weeks where the connective tissues inside the joint adapt over months, so that joint strength defined in its three parts, stability, load capacity and structural integrity, on the stronger joints supplement page, is mostly muscle in the first two parts and slow loading in the third, with the tested insurance policy that the prevention trials built on the build stronger joints page. The one vitamin that the register attaches to that strengthener is vitamin D, through its sentence that it contributes to normal muscle function, backed by the observational and trial evidence that low vitamin D goes with weaker proximal muscle and more falls in older adults and that correcting a low level restores function; and because the British sun from October to March is too low for the skin to make any vitamin D, so that around one adult in five or six is low by late winter and more among people with dark skin, covered skin or indoor lives, the national guidance's 10 micrograms a day through autumn and winter is the one vitamin a reader should take for stronger joints, not because it strengthens them, which the verb audit forbids, but because it maintains the muscle that does. So what a reader takes and does, in order, is this: vitamin D at 10 micrograms a day from October to March, all year if at risk, for the bone and the muscle; a varied diet with fruit, green vegetables, nuts, seeds and wholegrains for the vitamin C, vitamin K, copper and manganese that maintain the rest of the joint's tissues to sufficiency; and two or three sessions a week of resistance and balance work for the muscle around the joint, which is the only thing on the page that holds the verb the reader used. Collagen's place is beside the third item, as the tendon protocol's adjunct and the joint trials' small effect at 10g, and its label's vitamin C is a maintenance verb borrowed at the 15% threshold. The worked example is 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, carrying vitamin C's collagen formation sentence for the normal function of cartilage and bones, a maintenance verb, and zinc's, no vitamin D, and no strengthening claim, because the register permits none to anything in the capsule. What vitamins make your joints stronger: none may say so; vitamin D, C and K maintain the bone, the collagen and the muscle; and the muscle, trained, is what makes a joint stronger, with vitamin D the one vitamin attached to it.

What to check on the label