Here's the thing nobody tells you about your tendons and ligaments: they are not keeping pace with the rest of your training. Your cardiovascular fitness can shift in weeks. Muscle adapts in months. But connective tissue — the stuff that holds your knees, hips, and ankles together through every single pedal stroke — turns over on a timeline measured in months to years. And the raw material your body uses to maintain it starts declining before most of us have even clipped into a serious training programme.
That raw material is collagen. The most abundant protein in your body, responsible for the structural integrity of tendons, ligaments, cartilage, and bone. After about age 25, your body produces roughly 1 per cent less of it each year. Do the maths on a 45-year-old cyclist and you are looking at a 20 per cent decline in collagen production capacity, happening quietly in the background while you push out 5,000 pedal strokes per hour on every ride.
This is not a scare story. It is fixable. And the science has finally caught up with a practical protocol that actually makes sense for cyclists.
Why Cyclists' Connective Tissue Takes Such a Beating
Cycling is classified as a low-impact sport, and compared to running that is fair enough — your joints are not absorbing ground reaction forces with every stride. But low-impact does not mean low-load. Your patellar tendon, Achilles tendon, and the connective tissue around your hip flexors are under repetitive tension for hours at a time, pedal stroke after pedal stroke.
A typical road ride involves somewhere between 4,000 and 6,000 pedal strokes per hour. On a four-hour training ride, your patellar tendon has handled upwards of 20,000 loading cycles. That is not traumatic load — it is cumulative load. Small little leaks that add up. The tendon does not tear in one dramatic moment. It accumulates micro-damage faster than your body can repair it, and the first sign is usually a niggle that arrives and does not leave.
Add age to that equation and the picture shifts further. Collagen cross-linking changes as you get older. The tissue becomes stiffer and less elastic. Recovery from micro-damage slows down. The tendon you could abuse at 28 and have it bounce back by Tuesday now takes a week of grumbling before it settles.
This is why patellar tendinopathy, Achilles issues, and IT band irritation are so common in masters cyclists. It is not that cycling is destroying your joints. It is that the repair side of the equation has slowed down and the loading side has not.
Keith Baar and the Collagen Synthesis Research
Let me break this down, because this is the piece of research that moved collagen from the "maybe, who knows" category into something worth paying attention to.
Keith Baar is a professor of molecular exercise physiology at UC Davis. His research focus is connective tissue — specifically, how tendons and ligaments respond to mechanical loading and how you can influence that response through nutrition.
The study that matters most for cyclists was published in the American Journal of Clinical Nutrition in 2017. Baar and his team had subjects consume 15 grams of hydrolysed collagen (in the form of gelatin, enriched with vitamin C) 30 to 60 minutes before a short bout of exercise — specifically, six minutes of rope skipping. They then measured markers of collagen synthesis in blood samples.
The result: collagen synthesis doubled compared to placebo.
Here's where it gets really interesting. The vitamin C was not optional. Vitamin C acts as a cofactor for prolyl hydroxylase and lysyl hydroxylase — the enzymes responsible for cross-linking collagen fibres into their functional triple-helix structure. Without adequate vitamin C, those enzymes cannot do their job properly and the collagen your body produces is structurally weak. This is literally the mechanism behind scurvy — collagen that cannot cross-link properly.
The 30-to-60-minute pre-exercise timing window was also deliberate. Baar's hypothesis, supported by the data, is that collagen peptides need to be circulating in the blood and available to the tendon tissue at the moment when mechanical loading creates the stimulus for repair and remodelling. Take collagen with your evening meal or at a random point in the day and you miss the window where loading drives the adaptation signal.
So the protocol is specific: 15 grams of hydrolysed collagen, 50 milligrams of vitamin C, consumed 30 to 60 minutes before training. Not after. Not at bedtime. Before.
Not All Collagen Is the Same
Walk into any supplement shop and you will find collagen marketed for skin, hair, nails, joints, gut health, and probably a few other claims besides. Most of those products do not tell you which type of collagen you are buying, or they bury it in the small print.
Let me break this down because it matters for what you are actually trying to fix.
Type I collagen makes up about 90 per cent of the collagen in your body. It is the dominant structural protein in tendons, ligaments, bone, and skin. If your issue is patellar tendinopathy, Achilles tendon irritation, plantar fascia problems, or any of the connective tissue complaints that cyclists most commonly deal with, Type I is what you are after.
Type II collagen is the primary collagen in cartilage — the smooth tissue that cushions the surfaces inside your joints. If you have been told you have cartilage wear in your knees, or you have diagnosed osteoarthritis, Type II becomes relevant.
Type III collagen is found alongside Type I in skin, blood vessels, and organs. It is less relevant to the cycling-specific conversation.
For most cyclists reading this, the answer is straightforward: hydrolysed Type I collagen peptides. That is what the Baar research used, that is what supports the tendon and ligament structures most stressed by cycling, and that is what you should look for on the label. If the label does not specify the type, consider that a red flag and move on.
What Collagen Can and Cannot Do
I need to be direct about this because the supplement industry is not going to be.
What collagen supplementation does:
- Provides the specific amino acids — glycine, proline, hydroxyproline — that your body uses as building blocks for tendon and ligament repair
- When paired with vitamin C and timed before exercise, doubles the rate of collagen synthesis in tendon tissue (Baar's data)
- Supports the ongoing maintenance and remodelling process that keeps connective tissue healthy under repeated loading
- May reduce the risk of tendon injury in high-volume training phases by keeping the repair side of the equation better supplied
What collagen supplementation does not do:
- Rebuild cartilage that has already been lost to osteoarthritis
- Reverse structural damage in a torn tendon or ligament
- Replace the need for load management, proper bike fit, and adequate recovery
- Produce noticeable results in two weeks — connective tissue turnover is slow, and meaningful adaptation takes months
Think of it this way. Your body is already running a tendon maintenance programme around the clock. Collagen supplementation, done properly, gives that programme more raw material to work with. It does not create a new programme. If your training load is wildly beyond what your tendons can tolerate, no supplement fixes that — you need to address the load.
The good news is that for most riders, the gap between tendon damage and tendon repair is not enormous. It is a marginal shortfall, accumulated over months and years. Tipping the balance back towards the repair side with better nutrition and smarter timing is properly useful. It is just not magic.
Food Sources vs. Supplements
You can get collagen from food. Bone broth is the classic answer. Slow-cooked meats on the bone — lamb shanks, oxtail, chicken thighs. Fish with the skin on. Sardines. Chicken skin (which most people peel off and throw away, ironically enough).
These are all good foods and worth including in your diet regardless. But there are practical problems with relying on food alone if you are trying to follow the Baar protocol specifically.
First, the collagen content of food is inconsistent. A cup of bone broth might contain anywhere from 6 to 12 grams of collagen depending on how it was made, what bones were used, and how long it simmered. You do not really know what you are getting.
Second, the timing issue. You need collagen circulating in your blood 30 to 60 minutes before training. That means you need to eat a bowl of bone broth or a plate of sardines an hour before you get on the bike, pair it with a measured dose of vitamin C, and hope the digestion and absorption kinetics line up. It is a lot of variables.
Third, hydrolysed collagen peptides are pre-broken-down into smaller molecules that absorb faster and more predictably than whole collagen from food. That faster absorption is part of what makes the pre-exercise timing window work.
My practical take: eat good food that includes collagen sources as part of your broader cycling nutrition. That is baseline good nutrition. But if you are specifically trying to support tendon health through the Baar protocol — measured dose, vitamin C pairing, pre-exercise timing — a supplement gives you the control you need. The cost of a quality collagen supplement is modest relative to what most cyclists spend on kit and components, and it lasts a month or more per tub.
The Protocol: How to Actually Do This
The research-backed protocol is specific enough that I can give you the exact numbers.
Dose: 15 grams of hydrolysed collagen peptides (Type I). Some riders use 10 grams and still report benefit, but 15 grams is what was used in the published research.
Vitamin C: 50 milligrams minimum, taken at the same time as the collagen. This is a small amount — about the equivalent of half an orange. Many collagen supplements now include vitamin C in the formulation, which saves you remembering a second supplement. If yours does not, a small glass of orange juice or a vitamin C tablet does the job.
Timing: 30 to 60 minutes before exercise. Not with breakfast three hours before your ride. Not with your post-ride recovery shake. Before. The amino acids need to be in circulation when the mechanical loading stimulus from training hits.
Consistency: Daily. Connective tissue remodelling is slow. Taking collagen once a week before your big ride and expecting results is not how the biology works. The cumulative effect of consistent supplementation over weeks and months is what shifts the needle.
Duration: Give it a minimum of three months before you evaluate. Tendons turn over slowly. If you are expecting to feel different in a fortnight, you are thinking about this on a muscle adaptation timeline, not a connective tissue timeline. Be patient.
Here is a practical morning for a cyclist running this protocol: wake up, mix 15 grams of collagen powder into a small glass of water or juice (vitamin C covered either by the supplement formulation or the juice), drink it, get your kit on, and be rolling within 30 to 60 minutes. It adds about 90 seconds to your pre-ride routine.
A Note on Gelatin
Baar's original study actually used gelatin enriched with vitamin C, not hydrolysed collagen peptides. Gelatin is essentially cooked collagen — the same protein, less processed, and considerably cheaper. Some riders use gelatin dissolved in warm water with a squeeze of lemon juice as their pre-ride collagen source and that is a perfectly valid approach. The trade-off is texture and convenience. Gelatin sets into a jelly if it cools, and some people find it unpleasant to drink. Hydrolysed collagen dissolves easily in cold water and has almost no taste. Same amino acids, different user experience.
Who Benefits Most
Not every cyclist needs to be running this protocol. Let me be specific about where the cost-benefit calculation actually lands.
Masters Cyclists Over 40
This is the group where collagen supplementation makes the most sense. Your collagen production has been declining for 15 to 20 years. The tendons and ligaments you are asking to handle 10, 12, 15 hours a week of training load are operating with a reduced repair capacity. The gap between damage and repair widens every year after 40, and that is exactly the gap this protocol is designed to close.
If you are over 40 and training consistently, collagen should be somewhere on your supplement list. Not at the top — that spot belongs to adequate total protein, quality food, and sleep — but comfortably in the second tier alongside vitamin D and omega-3s.
Riders With Existing Tendon Issues
If you have patellar tendinopathy, Achilles tendon problems, or chronic IT band irritation that keeps coming back, collagen supplementation paired with a structured loading programme prescribed by a physiotherapist is the evidence-based approach. The supplement provides the raw material; the controlled loading provides the remodelling stimulus.
I want to be clear: collagen is not a substitute for proper rehab. But it supports rehab. If you are doing eccentric exercises for a patellar tendon issue, timing your collagen dose before that rehab session means the synthesis stimulus from loading arrives when the building blocks are already circulating. That is the principle straight from Baar's work.
High-Volume Trainers
If you are consistently riding more than 10 hours a week — which covers most serious amateur racers and anyone training for gran fondos, ultras, or multi-day events — the cumulative load on your connective tissue is substantial. Higher training volume means more pedal strokes, more loading cycles, and more micro-damage that needs to be repaired. Collagen supplementation as a maintenance strategy makes sense at these volumes regardless of age.
Who Can Probably Skip It
If you are 30 years old, riding six hours a week, eating well, sleeping well, and have no history of tendon or joint complaints — collagen is low on the priority list. Your body is still producing collagen at a reasonable rate, your training load is moderate, and there are better places to invest your money. Get your overall nutrition sorted first. If tendon niggles appear later, revisit this conversation.
Integrating Collagen With Your Recovery Nutrition
Collagen is not a replacement for your regular post-ride protein. It is a different tool aimed at a different tissue.
Your post-ride recovery shake — whey protein, casein, whatever you use — is targeting muscle protein synthesis. The leucine content in those proteins triggers the mTOR pathway that drives muscle repair and adaptation. Collagen is very low in leucine and does not trigger that pathway effectively. Taking collagen instead of whey after a ride would be a mistake.
The smart approach is to separate them:
- Pre-ride (30-60 minutes before): 15g hydrolysed collagen + vitamin C. This targets connective tissue and aligns with the mechanical loading window.
- Post-ride (within 30-60 minutes after): Your normal recovery nutrition — 20 to 40 grams of quality protein (whey, dairy, eggs, or a plant blend with adequate leucine), carbohydrates to replenish glycogen, fluids and electrolytes. This targets muscle recovery and glycogen replenishment.
The two are complementary, not competing. One feeds your muscles, the other feeds the scaffolding that holds your muscles to your skeleton. Both matter, especially as you age.
On rest days, you can still take your collagen dose. The evidence for rest-day benefit is less clear than for training days, but the amino acids are still available for the slow background turnover that connective tissue undergoes constantly.
Common Mistakes I See
A few patterns come up repeatedly in our community and they are worth flagging.
Taking collagen at the wrong time. This is the most common one. Riders add collagen to their evening meal or their morning coffee three hours before training. The timing is the single most important variable in the protocol. If you miss the 30-to-60-minute pre-exercise window, you are still getting the amino acids but you are missing the overlap between circulating peptides and mechanical loading that the research specifically demonstrated.
Using a product that does not specify the collagen type. If the label says "collagen" without specifying Type I, Type II, or a blend, you do not know what you are buying. For tendon and ligament support, you want hydrolysed Type I peptides. It should say so on the tub.
Expecting fast results. Muscle adaptation happens in weeks. Tendon adaptation happens in months. If you start collagen in July and decide it is not working by August, you have not given the tissue enough time to turn over. Three months minimum before you evaluate.
Replacing post-ride protein with collagen. Collagen is not a complete protein for muscle recovery purposes. It lacks adequate leucine to stimulate muscle protein synthesis. Keep your post-ride shake separate from your pre-ride collagen dose.
Ignoring the vitamin C. Fifty milligrams is not a lot, but it is not zero. Without it, the enzymatic cross-linking of collagen fibres is compromised. The vitamin C is a non-negotiable part of the protocol.
The Practical Verdict
Collagen supplementation is not a miracle fix for ageing joints. It is a specific, research-backed nutritional strategy for supporting the connective tissue that cyclists load heavily and repair slowly. The Baar protocol — 15 grams of hydrolysed collagen, 50 milligrams of vitamin C, 30 to 60 minutes before training — has the strongest published evidence behind it, and the practical execution is simple enough that there is no good reason not to try it if you fall into the target group.
If you are over 40, training consistently, and noticing that tendon niggles take longer to resolve than they used to, this is one of the most straightforward interventions you can make. It is not expensive. It does not interfere with your other nutrition. It adds 90 seconds to your pre-ride routine. And the downside risk is essentially zero — at worst, you have consumed some extra protein.
The people I would not rush this for: younger riders with no tendon history and moderate training loads. Fix your overall nutrition first. Get your total protein intake right. Sleep properly. Those foundations still carry more weight than any single supplement, and they always will.
But for those of you in the "my knee has been grumbling since March" category, or the "I used to bounce back from a hard block in three days and now it takes a week" category — the collagen conversation is worth having. The research supports it. The protocol is clear. And the cost of running the experiment on yourself is trivially low compared to the physio bills that accumulate when tendon issues go unaddressed.
Join the Conversation
If you want to talk through your own protocol, ask questions about dosing, or hear what other riders in the 40-plus bracket are doing for tendon health, the Roadman Cycling community on Skool is where that conversation happens daily. Coaches, physios, and experienced masters riders all in the same room. Come in, ask the question, and get a straight answer.