Is collagen good for runners?

The two tendons, and the one trial that measured return to running

Is collagen good for runners is a question with a better answer than most collagen questions, because the one collagen trial with a clinical outcome measured something a runner cares about, return to running, and the honest page starts there after naming the two tissues a runner is actually asking about. A runner's tendon load is unusual: every stride stores energy in the Achilles and patellar tendons and returns it, thousands of times an hour, so those two tendons take the sport's repeated energy-storage load and are where runners' tendinopathies live, the Achilles above all, with the warm-up pattern, pain at the start of a run that eases as the tendon warms and returns afterwards and the next morning, and a tender spot a few centimetres above the heel. For those tendons collagen has its two pieces of evidence, and both fit a runner better than a lifter. The pre-loading protocol, around fifteen grams of gelatin or hydrolysed collagen with roughly 50mg of vitamin C an hour before loading, doubled a blood marker of collagen synthesis in a small trial whose loading was six minutes of skipping, an energy-storage load very like running, and a run is itself a loading session, so a runner using the protocol takes the dose an hour before the run or the calf session without rearranging anything, which is the natural fit the best-collagen-for-running page describes. The clinical trial is the stronger piece for a runner because of what it measured: around twenty people with chronic Achilles tendinopathy were randomised to 2.5 grams a day of specific collagen peptides or placebo, both groups doing a six-month calf-strengthening programme, and the collagen group improved more on a validated Achilles function and pain score and returned to running sooner, a result that is small, manufacturer-funded and obtained beside the loading programme that is the established treatment, and that is nonetheless the only collagen trial whose outcome a runner would recognise as their own. So for a runner's tendons collagen is an adjunct with a marker trial and one small outcome trial that measured return to running, taken beside the calf raises and the load progression that do the work, and never instead of them.

The cartilage running does not wear, the protein budget runners under-eat, and the honest verdict

The second tissue a runner asks about is knee cartilage, and the honest news is better than the folklore. Recreational running is not associated with an increased risk of knee osteoarthritis in the cohort studies and meta-analyses, and some analyses find lower rates in recreational runners than in non-runners, the cartilage being mechanosensitive and maintained by the cyclic load of running within tolerance rather than worn by it, with the exceptions being very high competitive mileage and running on a previously injured knee. So a runner's knee cartilage is not being used up by the miles, which removes the main reason runners buy a joint supplement, and the collagen joint trials, at around ten grams a day over twelve to twenty-four weeks, measured joint comfort by questionnaire rather than cartilage by imaging, finding modest gains, so a runner whose knees ache after long runs has the joint comfort research at ten grams as an option, with no cartilage claim and no supplement anywhere having rebuilt cartilage on a scan. The third item is the protein budget, and it is where runners most often go wrong with collagen. Runners under-eat protein more often than lifters, the endurance habit favouring carbohydrate and the sport's lean culture discouraging bulk, while the protein need in heavy training runs at 1.6 grams per kilo or more for muscle repair and adaptation, and a runner who adds a collagen scoop and counts it toward that need has counted protein with no tryptophan and a third of whey's leucine, so the budget is filled with complete protein, dairy, eggs, meat, fish, soya or whey, and collagen is booked separately as the tendon adjunct it is. The runner's real levers sit outside the tub: load progression that does not jump mileage faster than the tendons can adapt, the ten percent rule and its cousins, since tendon adapts over months while fitness adapts in weeks; shoes and surfaces; strength training for the calves and quadriceps, which share the tendons' load; sleep; and a physiotherapist's loading programme when a tendon complains, isometrics first for pain, then heavy slow calf work, then hopping and a return by criteria, which is the programme the Achilles trial's participants were doing while they took their 2.5 grams. The verdict: collagen is good for runners as an adjunct to tendon rehabilitation and tendon loading, by two small pieces of evidence, one of which measured return to running, and it is not good for a runner's cartilage, which running does not wear and no supplement rebuilds, nor as a runner's protein, which it is not. The worked example is the runner's adjunct at the clinical trial's dose: two capsules, 1200mg hydrolysed type 1 marine collagen with 12mg vitamin C plus zinc, 120 for £16.99 at 28p a day, lab tested and UK made, near the Achilles trial's 2.5 grams and below the protocol's fifteen, taken beside the calf programme for vitamin C's collagen formation sentence, while the protocol runner buys fifteen grams of powder for the hour before the run. Is collagen good for runners: for the two tendons, as research with a return-to-running outcome behind it; for everything else in the sport, no.

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