Collagen for runners: can it really support your tendons and joints?

Collagen has gone from a skincare buzzword to a staple on the shelf of many runners. The pitch is appealing: take a scoop before you train and give your tendons, ligaments and joints a bit of extra support. For anyone who has battled a grumbly Achilles or a niggly knee, that sounds well worth a try. The honest answer is more measured. There is a plausible theory and some encouraging early research, but the evidence is still limited and mixed, and collagen is best thought of as a small helping hand rather than a cure. Here is what it is, what the science currently suggests, and how to think about it if you want to give it a go.

What is collagen, and why do runners care?

Collagen is the main structural protein in connective tissue: your tendons, ligaments, cartilage, bone and skin. Tendons and ligaments are largely made of collagen, and it gives them the strength and springiness that let you run in the first place. Running loads these tissues over and over, and connective tissue is generally slower to adapt and repair than muscle, partly because it has a poorer blood supply. That is one reason tendon niggles can hang around for weeks.

The idea behind a collagen supplement is to supply the raw materials that your body uses to build new collagen, especially amino acids such as glycine and proline, at a moment when the tissue is primed to use them. It is a sensible starting point. The question is whether topping up those building blocks makes a meaningful difference in practice, and that is where things get less tidy.

What is the theory behind taking it before you train?

The protocol that gets discussed most comes from research into collagen or gelatin taken with vitamin C roughly an hour before a short bout of loading. Vitamin C matters because it is a cofactor your body needs to actually assemble collagen, so the two are usually paired. The thinking runs like this: loading a tendon sends a build signal to the tissue, and if the amino acids and vitamin C are already circulating at that point, they are on hand to support new collagen synthesis.

In the studies behind this idea, blood markers of collagen production rose after the pre-loading dose, which is why the 30 to 60 minute window gets so much attention. It is worth being clear about what that shows and what it does not. A rise in a short-term blood marker is an encouraging signal, not proof of fewer injuries, stronger tendons over a season, or less pain. It is a promising mechanism that still needs to be matched by real-world outcomes.

What does the evidence actually say?

This is where honesty matters. Reviews of the research so far tend to describe it as promising but low to moderate in quality. Trials are often small, they use different formulations, doses and timings, and they measure different things, all of which makes it hard to draw firm conclusions. That does not mean collagen does nothing. It means we should be cautious about strong claims in either direction.

Some studies that combined collagen with a structured strength programme have reported changes in tendon size or properties over several weeks, and a handful have suggested improvements in pain and function for certain tendon problems when collagen was added on top of a loading plan. Other studies have found little difference. What the current picture does not support is the idea that collagen on its own prevents injuries or clears up tendon pain. At best it looks like a useful adjunct sitting alongside the training that does the real work.

How much should you take, and when?

Because the research is still evolving, treat any numbers as rough guides rather than prescriptions. The pre-loading approach that gets talked about most uses somewhere around 15g of collagen peptides or gelatin, taken with a source of vitamin C, in studies often about 50mg, roughly 30 to 60 minutes before you load the tendon. Some longer training studies have used higher daily amounts, in the region of 15g to 30g. Timing your dose before a session that already loads the target tissue, such as your strength work or a run, is the logic most protocols follow.

Collagen is generally considered well tolerated, but more is not automatically better, and the ideal dose and timing are honestly still being worked out. If you are pregnant, managing a health condition, or taking medication, check with a pharmacist or your GP before adding any new supplement.

Can you get enough from food alone?

For most runners eating enough total protein, the body already makes collagen from the amino acids in a varied diet, along with the vitamin C found in fruit and vegetables. Collagen itself also turns up in foods like bone broth, the skin and connective tissue of meat and fish, and gelatin, foods that are less common in a typical modern diet than they once were. Whether whole foods deliver the same building blocks at the same helpful moment as a timed dose is one of the open questions the research has not fully settled.

That is really the appeal of a supplement: it is a convenient, concentrated way to get specific building blocks around a training session. If your overall diet is patchy, though, tidying that up will almost certainly do more for your tissues, and the rest of your running, than any single powder.

Who might consider trying it?

Collagen is most likely to appeal to runners with recurring niggly tendons, members working back from a tendon issue as part of a rehab plan, or those training at high loads who want to cover their bases. Even then, it should sit on top of the basics rather than replace them: gradual increases in mileage and intensity, regular strength work, and enough sleep and fuel to recover.

This is exactly the kind of balance a good plan gets right. Edge treats running, strength and HIIT as one joined-up programme rather than separate boxes, so the strength work that actually helps protect your tendons does not quietly get dropped when your mileage climbs. If you do decide to trial collagen, give it a fair run of several weeks alongside your loading, and keep your expectations realistic about what a supplement can add.

So, is collagen worth taking?

For most runners, collagen is an optional extra rather than an essential. It is unlikely to do harm, the theory is reasonable, and the pre-loading routine is simple enough that some members like to trial it around rehab or a heavy training block. Just keep your expectations in proportion. If you only have the energy to get one thing right, make it consistent strength work and sensible progression, because that is what the evidence most clearly supports.

Collagen will not undo training errors. If your mileage jumps too quickly, your calves and glutes are weak, or you are running through sharp pain, no supplement will bail you out. Tendons adapt to load, so progressive loading and strength work are the foundation, and collagen is at most a supporting act. Persistent or worsening tendon pain deserves a proper assessment rather than a guess, so think of collagen as the seasoning, not the meal.

This article is general guidance, not medical advice. If you are new to exercise, returning from injury, pregnant, or managing a health condition, speak to your GP before starting, and see a physio for any niggle that does not settle.