Sore knees after training, on the stairs, or during five-a-side? Here's what's actually happening in the joint - and what the research does and doesn't show about collagen.
Knee pain is one of the most common complaints among active men in their 30s and 40s. It shows up after squats, on the stairs, during runs, or the morning after a match. For most men it starts as a minor annoyance - then gradually becomes something they train around rather than address. Understanding what's causing it makes it easier to tackle properly.
What's Actually Going On in the Knee
The knee is one of the most complex and heavily loaded joints in the body. Every time you squat, run, jump, or change direction, forces of several times your bodyweight pass through it. The soft-tissue structures that move and stabilise the joint - the tendons and ligaments - are built largely from Type I collagen, the most abundant structural collagen in the body.
As natural collagen production declines from your mid-20s, the maintenance and repair capacity of these tissues gradually falls behind their workload. Combined with high training volumes, impact sports, or previous injuries that never fully healed, the result is the kind of chronic low-grade knee discomfort most active men know well.
The Most Common Knee Pain Patterns in Active Men
Not all knee pain is the same. The most common patterns in men who train are:
- Patellar tendinopathy ("jumper's knee"): pain below the kneecap, typically after jumping, squatting, or leg pressing - a tendon issue driven by repeated load without adequate recovery
- Patellofemoral pain ("runner's knee"): aching around or behind the kneecap during stairs, running, or prolonged sitting - often linked to how load is distributed through the joint
- General post-training stiffness: soreness and tightness the day after leg sessions or matches - connective tissue fatigue rather than acute injury
- Morning stiffness: tightness on first movement that eases after 10–20 minutes - a common experience as tissue quality changes with age
Several of these involve the collagen-based soft tissues around the knee. They are generally managed the same way: reduce load temporarily if needed, improve recovery quality, and seek assessment if the pain persists.
How Collagen Fits Into Knee Tissue Support
Hydrolysed collagen peptides are broken down into specific amino acids - particularly glycine, proline, and hydroxyproline - that the body uses as building blocks in connective tissue. Unlike whey protein, which targets muscle protein synthesis, collagen peptides supply the specific amino acids concentrated in tendons and ligaments.
Research has investigated whether collagen peptides affect exercise-related joint discomfort. Studies in this area typically use 5–15g daily, measured at 8–24 weeks. Published findings should be interpreted in the context of each study's ingredient, dose, design, duration, participant group and outcomes measured, and no study has shown that collagen treats or relieves knee pain.
Which Collagen Is Best for Knee Tissues
For the soft tissues around the knee, hydrolysed Type I bovine collagen is the practical choice. Type I is the primary structural collagen in tendons and ligaments - the tissues most commonly involved in men's knee pain patterns - and it's the most extensively studied form.
The collagen also needs to be hydrolysed - enzymatically broken down into peptides small enough to be absorbed efficiently. Non-hydrolysed collagen passes largely unabsorbed. Revayo Prime uses FORTIGEL®, a Type I bovine collagen peptide.
How Men Typically Take Collagen
Revayo Prime provides 14.77g of hydrolysed Type I bovine collagen plus 189.9mg Vitamin C per serving - unflavoured, dissolves in coffee or water, and designed to be taken daily without any friction.
Collagen Is Part of the Approach - Not All of It
Collagen is one small part of a broader approach to knee health. On its own, it won't overcome consistently poor training habits, chronic overload, or structural damage - and it is a food supplement, not a treatment for knee pain.
- Load management: progressive overload matters - connective tissue adapts more slowly than muscle, so volume increases need to be gradual
- Recovery: sleep and rest days are when connective tissue repairs - skipping them accelerates the deficit
- Strength balance: quad-to-hamstring strength imbalances are a common driver of knee issues - addressing these reduces load on the joint
- Collagen + Vitamin C: a food supplement, not a treatment - Vitamin C contributes to normal collagen formation for the normal function of cartilage, bones, skin, blood vessels, gums and teeth
Research context
Research relevant to knee-related outcomes uses specific collagen peptide ingredients, doses, study designs and participant groups. Findings should be interpreted within those study conditions rather than treated as proof of a guaranteed result for every reader.
Published findings relate to the ingredient and outcomes studied. Revayo Prime is a food supplement and is not a substitute for professional advice, rehabilitation or medical care.
Vitamin C contributes to normal collagen formation for the normal function of cartilage, bones, skin, blood vessels, gums and teeth. This authorised claim relates to the Vitamin C in Revayo Prime.
Support the Tissues That Take the Load.
Revayo Prime - 14.77g FORTIGEL® hydrolysed collagen peptides + 189.9mg Vitamin C per serving. Made in the UK, no fillers and no proprietary blends. 450g pouch, 30 servings - £39.99, £1.33 a day.
Buy 3 and save £10 - a 90-day supply
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Further reading: Does collagen help with strength - what the science says - Best time to take collagen
Note: This article is for general information only and does not replace medical advice. Revayo Prime is a food supplement and is not intended to diagnose, treat, cure or prevent any disease. If you have persistent or severe pain, consult a qualified healthcare professional before starting any supplement programme.