Collagen Supplementation for Runners: Can It Actually Help?
If you’re a runner, triathlete, or hybrid athlete, you’ve probably heard that collagen could support your training or help prevent injury.
Maybe you’re managing Achilles pain.
Maybe your knees get irritated during higher mileage.
Or maybe you’re trying to stay injury-resilient through heavy training blocks.
So does collagen actually help?
Let’s break it down.
Why Tendons Need Support
Tendons connect muscle to bone and absorb a huge amount of force with every stride. The Achilles tendon alone can handle forces several times your body weight while running.
The challenge? Tendons adapt much more slowly than muscles. When training load increases faster than your tendons can remodel, irritation or injury can happen.
This is where nutrition may play a supportive role.
What Is Collagen?
Collagen is the main structural protein in tendons, ligaments, cartilage, and bone.
It’s rich in three key amino acids:
Glycine – makes up about one-third of collagen and provides structure
Proline – helps form the collagen triple-helix structure
Hydroxyproline – stabilizes collagen fibers and contributes to tendon strength
Unlike whey or other complete proteins, collagen is not high in leucine and isn’t ideal for muscle protein synthesis. Its potential value is more specific to connective tissue support.
Your body can make collagen — but it requires:
These amino acids
Vitamin C
Mechanical loading (exercise)
That last part is critical.
Collagen doesn’t “fix” tendons. It appears to support adaptation when combined with proper loading.
What Type of Collagen Is Best for Athletes?
For tendon health, the research has primarily used:
Hydrolyzed collagen peptides (Type I dominant)
Type I collagen is the primary form found in tendons. Hydrolyzed collagen peptides are broken down into smaller fragments, making them easier to digest and absorb.
You don’t need expensive multi-type blends. A simple collagen peptide supplement is sufficient.
What Does the Research Say?
A 2024 systematic review and meta-analysis published in Sports Medicine (Bischof et al., 2024) looked at collagen supplementation combined with long-term training.
The findings were encouraging:
Improvements in tendon structure
Positive effects on muscle architecture
Increases in fat-free mass
Improvements in strength outcomes when collagen was paired with training
Importantly, collagen worked best alongside mechanical loading, not in isolation.
A 2023 review in the Journal of Sport Rehabilitation (Boldt et al., 2023) also found that collagen combined with exercise may improve tendon structure and reduce pain, particularly in rehabilitation settings. However, the authors emphasized that the evidence is still developing.
More broadly, a 2025 meta-analysis in Frontiers in Nutrition (Sun et al., 2025) found collagen supplementation supported markers of bone and muscle health, suggesting potential wider connective tissue benefits — especially relevant for masters endurance athletes.
In simple terms:
The research is promising.
But it’s not a miracle solution.
Collagen works best as part of a structured training plan.
Why Is Vitamin C Included?
Vitamin C is required for collagen synthesis. It acts as a cofactor for enzymes that stabilize collagen fibers.
Earlier human research demonstrated that consuming collagen (or gelatin) with vitamin C about 30–60 minutes before exercise increased markers of collagen production.
The theory is that taking collagen before loading allows those amino acids to circulate during exercise, when blood flow to connective tissue increases.
How to Take It for Tendon Support
Based on current evidence:
10–15 g hydrolyzed collagen peptides
At least 50 mg vitamin C
30–60 minutes before strength training or rehab exercises
Used consistently during high tendon load or rehab phases
It’s not necessary after every run.
And it doesn’t replace adequate total daily protein intake.
Who Might Benefit Most?
Collagen may be helpful for:
Athletes with recurring tendinopathy
Runners returning from tendon injury
High-mileage endurance athletes
Masters athletes
Hybrid athletes performing high-impact training
If you’re training well and not managing tendon issues, it may not be essential.
The Bottom Line
Current evidence suggests collagen supplementation may support tendon remodeling when paired with mechanical loading.
The research is promising but still evolving, particularly in athletic populations.
For endurance athletes navigating high training loads or tendon rehab, collagen can be a useful adjunct strategy.
But as always:
Adequate total protein.
Smart training progression.
Recovery.
Energy availability.
Those are the foundations.
Collagen supports the system, it doesn’t replace it.
