What vitamin helps ligament repair?

The subtraction experiment: vitamin C, and the one subtraction that stops repair

What vitamin helps ligament repair is a question that is usually answered by addition, a list of vitamins each said to support the healing ligament, and the honest page answers it by subtraction instead, because the deficiency literature has already run the experiment of removing each vitamin from a body and recording what breaks, and reading those results for a healing ligament tells a reader which vitamins repair requires, which help the tissues around it, and which are passengers. A ligament heals through an inflammatory phase of days, in which the tear bleeds, clots and is cleared and repair cells are recruited; a proliferative phase of weeks, in which fibroblasts lay down a scar of mostly type III collagen; and a remodelling phase of months, in which type I replaces type III and the scar aligns and strengthens under load. Remove vitamin C and the proliferative phase fails outright. The fibroblasts recruited to the tear make collagen chains as instructed, but the enzymes that must hydroxylate those chains before they can fold into a triple helix, the prolyl and lysyl hydroxylases, require vitamin C as a cofactor and stop without it; unhydroxylated chains cannot fold, are recognised as defective and are degraded inside the cell, and no functional collagen leaves it, so the scar is never laid down and the ligament does not repair. This is the mechanism of scurvy's poor wound healing, in which cuts fail to close and old scars reopen as the collagen holding them is not maintained, and it makes vitamin C the one vitamin whose presence ligament repair requires absolutely, the result that every honest ligament vitamin page should begin with and end with. The caveat is the size of the deficiency: the hydroxylases need vitamin C present at ordinary tissue levels and no more, so a person eating any fruit or vegetables has what the enzymes need, repair proceeds at the rate load and time allow, and adding vitamin C above sufficiency does not speed the hydroxylation or the phase, which is why the UK register's sentence is that vitamin C contributes to normal collagen formation for the normal function of cartilage and bones, a maintenance sentence, and why no trial has shown vitamin C above sufficiency accelerating a ligament. Iron sits beside vitamin C in the same enzymes, and removing it, in the iron deficiency that is common in menstruating women and in some vegans, impairs the same step less completely, a second subtraction that matters and is met from meat, pulses and fortified foods.

The other subtractions: D, K, A, E and the B group, the minerals, and what adding back does

Remove vitamin D and the ligament itself is largely unaffected but the joint around it suffers: vitamin D's established role is in muscle function and bone, so a deficient person has weaker muscle around the injured joint and the healing ligament carries load that the muscle should be sharing, while the bone the ligament attaches to is less well maintained. This is an indirect effect through the joint's other stabiliser rather than through ligament biology, which is what the register's sentences describe, maintenance of normal muscle function and normal bones, and it is the reason a UK adult rehabilitating a ligament through winter takes ten micrograms a day by guidance and not the reason the ligament heals. Remove vitamin K and the inflammatory phase is impaired at its very start, since vitamin K is required for the clotting factors that stop the bleeding in a torn ligament and begin the clot that repair cells migrate into, a day-one effect that matters in a deficiency and is irrelevant in anyone eating leafy vegetables; the register's sentence is normal blood clotting and normal bones. Remove vitamin A and epithelial wound healing suffers, skin and gut lining repairing poorly, while ligament, a dense connective tissue with no epithelium, is barely affected; a passenger for this question. Remove vitamin E or any of the B group and nothing specific to a ligament changes, since their roles are in antioxidant defence and energy metabolism across every tissue and no ligament-specific step depends on them; passengers too. The minerals complete the experiment and belong on the page because the shelf confuses them with vitamins: remove copper and lysyl oxidase, the enzyme that cross-links collagen fibrils outside the cell, fails, so the scar is laid down but never gains its rope strength, the rare connective tissue weakness of copper deficiency; remove zinc and the matrix metalloproteinases and other enzymes that remodel the scar in the months phase slow, and protein synthesis generally falls; both are met from nuts, seeds, shellfish, meat and whole grains, and the register's connective tissue sentences belong to copper and manganese. Reading the experiment as a whole, vitamin C is the vitamin ligament repair requires, iron and copper and zinc are the minerals its steps require, vitamin D and vitamin K support the tissues and the phase around the repair, and the rest are passengers; every one is met by an ordinary varied diet carrying enough protein, and what adding any of them back to a replete person does is nothing, because the phases of ligament repair are run by protection in the first days, progressive load from the first week and time through the months, with the vitamins as conditions that must be present and never as accelerators. The worked example is the required vitamin paired with collagen 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, the vitamin C carrying its collagen formation sentence for cartilage and bones, the zinc its protein synthesis sentence, and the collagen holding no ligament claim, since none exists. What vitamin helps ligament repair: vitamin C, by being present, found by taking it away.

What to check on the label