Last reviewed: May 12, 2026 Last updated: May 12, 2026

Written by: Jay Hastings , CEO of PlexusDx

Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations. He has more than 20 years of experience across healthcare innovation, genomics, laboratory operations, healthcare investing, and strategic finance. His work has included scaling healthcare startups, leading CLIA lab integrations, and helping expand consumer access to precision health tools.

Medically reviewed by: Jayden Lee, PharmD, EMBA

Jayden Lee, PharmD, EMBA, is the PlexusDx Medical Science Liaison with a PharmD and MBA specializing in pharmacogenomics and clinical product development, with a proven ability to bridge the gap between genomic research and practical patient outcomes. Dr. Lee has more than 10 years of professional experience in clinical pharmacy, academia, and research.

Understanding Your Tendon Health and the COL5A1 Gene

Tendons connect muscle to bone and play a key role in joint stability, movement, and injury prevention. The COL5A1 gene helps control how collagen fibrils form and organize inside tendons. Collagen quality and structure influence tendon strength, flexibility, and how well tissues recover from stress. Variations in a common COL5A1 genetic marker, rs12722, are linked to different risks for tendon and ligament injuries.

How this gene affects your tendons

  • COL5A1 influences collagen fibril size and alignment. Strong, well-organized fibrils make tendons more resilient to load and strain.
  • Different rs12722 genotypes correlate with variable tendon properties and injury risk.
  • Genetics is only one part of the picture. Training, nutrition, hydration, movement patterns, and recovery practices matter a great deal.

General recommendations to support tendon health

  • Exercise: Combine progressive strength training for surrounding muscles with targeted tendon loading exercises (slow eccentric work for tendinopathy prevention and rehabilitation).
  • Flexibility and mobility: Regular controlled stretching and dynamic mobility to maintain joint range without overstretching tendons.
  • Progression and load management: Increase intensity and volume gradually. Avoid sudden jumps in loading or repetitive overuse.
  • Nutrition: Prioritize adequate protein to supply amino acids for tissue repair, and vitamin C to support collagen synthesis. Consider collagen or hydrolyzed collagen supplementation if appropriate.
  • Hydration: Maintain good hydration to support tissue health and recovery.
  • Recovery: Prioritize sleep, active recovery, and appropriate off-days to allow tendon remodeling.
  • When to consult a provider: Seek assessment for persistent tendon pain, swelling, or functional loss. Your healthcare professional can tailor testing, imaging, and treatment.

Genetic Interpretation: rs12722 (COL5A1)

Use the sections below to see what your genotype may mean for tendon resilience and practical steps to protect and optimize tendon health.

2 effect alleles — CC genotype

What this means

If you have the CC genotype for rs12722, you carry two copies of the effect allele. This genotype is associated with more favorable tendon characteristics and a lower relative risk of tendon and ligament injuries compared to other genotypes. Your COL5A1 variation likely supports better collagen fibril formation, which can improve tendon resilience and stress tolerance.

Actionable tips

  • Maintain a balanced routine of strength training and flexibility work to protect this genetic advantage.
  • Include tendon-specific loading sessions 2 to 3 times per week, using slow eccentric or heavy slow resistance protocols when appropriate.
  • Keep protein intake adequate for repair — aim for regular high-quality protein servings across the day.
  • Consume vitamin C daily through food (citrus, berries, peppers) or a supplement if dietary intake is low.
  • Consider collagen peptides around training sessions to support collagen synthesis, paired with vitamin C.
  • Monitor training load and avoid sudden increases that can outpace tissue adaptation.
1 effect allele — CT genotype

What this means

If you have the CT genotype, you carry one copy of the effect allele. This indicates a moderate genetic predisposition: your tendon properties may be intermediate, neither as protective as CC nor as elevated risk as TT. Your tendons may require more attention to preventive care, especially if you take part in high-load or repetitive sports.

Actionable tips

  • Prioritize preventive tendon care: incorporate both strength and mobility work into your weekly routine.
  • Include progressive tendon-loading exercises, emphasizing controlled tempo and gradual increases in load.
  • Optimize nutrition with sufficient protein and daily vitamin C to promote collagen production.
  • Consider low-dose collagen supplementation if you have high training loads or are recovering from minor tendon discomfort.
  • Limit repetitive overload: vary activities, cross-train, and build in rest periods to reduce cumulative tendon stress.
  • Pay attention to early signs of tendon irritation — soreness that worsens with use or does not recover with short rest warrants evaluation.
0 effect alleles — TT genotype

What this means

If you have the TT genotype, you carry two copies of the non-effect allele. Research links this genotype with higher susceptibility to tendon and ligament problems, such as Achilles tendinopathy, tennis elbow, and ACL injuries. This variation may influence collagen fibril formation in a way that reduces load tolerance and recovery efficiency.

Actionable tips

  • Adopt a conservative and structured training approach: prioritize gradual load progression and technique to reduce injury risk.
  • Emphasize tendon-specific strengthening using eccentric and isometric exercises that are proven to improve tendon capacity.
  • Ensure daily vitamin C and adequate protein intake to support collagen repair and remodeling.
  • Consider collagen peptide supplementation, particularly around training sessions, to support collagen synthesis when combined with vitamin C.
  • Increase warm-ups and implement movement screening to correct biomechanical factors that load tendons unevenly.
  • Limit repetitive high-volume or high-impact activities when possible, and plan recovery days and cross-training options.
  • Consult a physical therapist or sports medicine provider for personalized programs if you have recurring tendon symptoms or a history of tendon injury.

Diet, supplements, and lifestyle — practical guidance

  • Protein: Aim for regular servings of protein (eggs, fish, poultry, legumes, dairy, or plant-based alternatives). Typical targets vary by activity level, but spreading protein across meals supports tissue repair.
  • Vitamin C: Consume fruits and vegetables rich in vitamin C daily, or use a supplement if dietary intake is low. Vitamin C is a key cofactor for collagen formation.
  • Collagen supplements: Hydrolyzed collagen or collagen peptides may help provide amino acids that support collagen synthesis. Best when taken with vitamin C and timed near training sessions.
  • Omega-3s: Anti-inflammatory omega-3 fatty acids from fatty fish or supplements can support recovery, especially after intense training.
  • Hydration and sleep: Both are essential for tissue repair and overall recovery. Aim for consistent good sleep and adequate daily fluids.

When to get further testing or clinical care

  • Persistent tendon pain, swelling, or reduced function despite rest and basic care.
  • Recurrent tendon injuries or a family history of connective tissue disorders.
  • Before beginning an intense training program if you have prior tendon injuries — a professional assessment can reduce risk.
  • Your healthcare provider may recommend imaging, blood tests for inflammatory or metabolic contributors, or a tailored rehabilitation plan.

PlexusDx provides genetic education to help you understand predispositions and possible preventive strategies. This information is educational only and does not replace medical advice. Always consult your healthcare provider before starting new supplements, making significant changes to exercise, or pursuing medical testing or treatment.

If this genetic variant is present in your PlexusDx results, the following tests and reports are commonly used to explore it further:

🧬 Genetic Tests:

🧪 Blood Tests:

📄 Genetic Report:

Frequently Asked Questions About Tendon Strength and COL5A1 rs12722

How does the COL5A1 rs12722 variant affect tendon injury risk?

The COL5A1 rs12722 variant is linked to differences in how collagen fibrils form and align within tendons. Because tendon collagen structure influences strength, flexibility, and stress tolerance, your rs12722 genotype can correlate with a lower or higher relative susceptibility to tendon and ligament injuries (including conditions like Achilles tendinopathy, tennis elbow, and ACL injuries).

What do rs12722 genotypes (CC, CT, TT) mean for tendon resilience?

If you have the CC genotype (two effect alleles), you’re associated with more favorable tendon characteristics and a lower relative risk of injury due to stronger collagen fibril formation. If you have CT (one effect allele), risk and tendon properties are more intermediate, meaning tendon care may need more attention with higher-load or repetitive training. If you have TT (two non-effect alleles), research links it with higher susceptibility, potentially reflecting reduced load tolerance and recovery efficiency.

What practical steps can support tendon health regardless of my rs12722 genotype?

Support tendon health with progressive strength training for surrounding muscles plus targeted tendon-loading (such as slow eccentric or heavy slow resistance when appropriate), and maintain joint mobility with controlled flexibility work. Manage training load gradually to avoid sudden spikes, prioritize adequate protein and daily vitamin C to support collagen repair, consider hydrolyzed collagen/collagen peptides (especially around training and paired with vitamin C if appropriate), and maintain good hydration and sleep. If you have persistent tendon pain, swelling, functional loss, or recurring injuries, seek assessment from a healthcare professional.

What tests can help me learn more about Tendon Strength and COL5A1 rs12722?

The Functional Health Genetic Test delivers over 750 personalized genetic insights across 10 in-depth genetic reports to support whole-body, systems-level health understanding. The Fitness and Injury Genetic Report translates your results into personalized, actionable guidance. Your healthcare provider can also recommend targeted blood tests based on your specific pathway results and health history to complement your genetic insights with current biomarker data.

Medical and Editorial Standards

Medical review process: This article was reviewed for medical accuracy, scientific clarity, evidence alignment, and appropriate discussion of genetics, medications, supplements, biomarkers, and health-related claims.

Sources and evidence: PlexusDx educational content is developed using peer-reviewed research, clinical literature, reputable medical references, and, where applicable, public health or regulatory guidance. References are included at the end of the article when scientific, medical, or health-related claims are discussed.

Commercial transparency: PlexusDx offers genetic testing, blood biomarker testing, personalized supplement recommendations, and related precision wellness services. Product mentions are intended to help readers understand available options and should not be interpreted as medical advice.

Important disclaimer: PlexusDx educational content is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about medications, supplements, genetic testing, lab testing, or health-related care.