Do any supplements help tendon repair?

What rebuilds tendons: the cell, the signal, and the shopping list

Do any supplements help tendon repair is a question whose forum version, what rebuilds tendons, is the better one to answer, because the literal answer to it, a cell, tells a reader immediately which supplements can matter and which cannot. Tendons are rebuilt by tenocytes, the sparse, elongated cells that live between the collagen fibres and make, maintain and remodel the matrix around them, and tenocytes take their instructions from one signal, mechanical strain. When a tendon is loaded, the cells sense the strain through their attachments to the matrix and raise collagen synthesis, with a peak around a day after the session and a period of net breakdown before net gain; when a tendon is unloaded, synthesis falls and the matrix it maintains loses quality. This is why progressive loading is the treatment of tendinopathy and why early controlled loading heals a repaired tendon better than immobilisation, and it is the first fact about supplements: no capsule delivers the signal, so nothing on a shelf makes a tenocyte work, and a supplement taken by a rested tendon is substrate delivered to a cell that is not building. Given the signal, the cell needs a short shopping list to act on it, and the list is where supplements can enter. It needs amino acid substrate, since collagen is a third glycine and rich in proline and lysine, supplied by dietary protein and, for a reader eating 1.6 to 2.2g per kilogram, supplied in surplus. It needs vitamin C and iron as cofactors for the prolyl and lysyl hydroxylases that hydroxylate the chains, without which collagen cannot fold into its triple helix, the mechanism of scurvy's connective tissue failure. It needs copper for lysyl oxidase, the enzyme that cross-links collagen fibrils outside the cell and gives tendon its rope strength. It needs zinc for the matrix metalloproteinases and other enzymes that remodel old matrix as new is laid down. And it needs the body around it fed, since a hard energy deficit slows every repair. Every item on the list is met from an ordinary varied diet, and the UK register's sentences match it exactly: vitamin C contributes to normal collagen formation for the normal function of cartilage and bones, copper to the maintenance of normal connective tissues, zinc to normal protein synthesis, iron to normal oxygen transport; all maintenance sentences, none of them repair, because the list is what the cell needs to do its job and not what makes it do more.

Where a supplement can help, where it cannot, and the names that are not on the list

Where a supplement can help follows from the list: it fills a gap on it or it times an item to the signal. A gap is rare in a well-fed lifter and real in some readers, the vegan with a low iron and zinc intake, the dieter in a long deficit, the reader whose fruit and vegetable intake is near zero and whose vitamin C is marginal, the UK adult short of vitamin D through winter whose stabilising muscle around the joint is weaker for it; for those readers the supplement is the missing item, cheap and specific, and the tendon benefits because the cell's list is complete again, not because the supplement did anything a steak would not. Timing is the collagen protocol's contribution: 15g of gelatin or hydrolysed collagen with vitamin C about an hour before the loading session raises blood glycine, proline and small collagen peptides to a peak that coincides with the strain signal, and the Baar trial measured a doubled blood marker of collagen synthesis against placebo with engineered ligaments in the participants' serum showing more collagen and stiffness, while one small six-month trial of 2.5g of collagen peptides beside calf strengthening in Achilles tendinopathy reported better function and earlier return to running than the exercise with placebo. That is the supplement evidence for tendon repair in full: a cofactor list met from food, and one timed-substrate protocol with a marker trial and a small outcome trial, both beside loading. The names that fill the forum threads and are not on the list deserve a sentence each. Glucosamine and chondroitin are cartilage molecules with a joint rationale and mixed knee osteoarthritis trials, and no tendon repair trial. MSM and turmeric or curcumin are anti-inflammatory candidates with small joint pain trials and nothing in tendon, and tendinopathy is in any case a load problem rather than an inflammatory one. Omega-3 has a joint stiffness literature in inflammatory arthritis and no tendon repair evidence. The injectable peptides that recur in forum threads, pushed as tendon healers, are unlicensed medicines in the UK, sold outside any quality control, with animal data only and a place on the prohibited list in sport, so they are not supplements at all and a reader who injects one is outside the law and inside a risk nobody has measured. What rebuilds tendons is therefore the tenocyte, under a loading programme a physiotherapist has built, with its list filled from the plate, and the only supplement question with evidence is whether to time collagen and vitamin C to the session. The worked example is the habit version of that pairing and 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, below the 15g protocol dose, carrying vitamin C's collagen formation sentence and zinc's protein synthesis sentence and no tendon claim, because collagen holds none. Do any supplements help tendon repair: those that complete the cell's list where it is short, and the one that times substrate to load, and nothing that works in place of the load.

What to check on the label