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.

The IGF1 rs35767 Variant, the IGF-1 LR3 Pathway, and Muscle Growth: What Your Genotype May Mean

IGF-1 is a natural growth signal that helps the body build muscle, repair tissue, and support recovery after exercise or injury. It works through pathways that encourage protein synthesis, muscle cell growth, and activation of satellite cells, which help rebuild muscle fibers, while also supporting tendon and ligament repair through collagen production. IGF-1 LR3 is a laboratory-studied version designed to last longer and stay more active, so it is often used to explore how stronger IGF-1 signaling may affect regeneration. The IGF1 gene helps control how much IGF-1 the body makes, and natural differences in this gene may influence growth, recovery, and tissue repair signals.

Genetic variation in the IGF1 gene may influence how efficiently the biological processes connected to IGF-1 LR3 and Muscle Growth function. The rs35767 variant is analyzed in the PlexusDx Precision Peptide Genetic Test as part of the Muscle Growth pathway. Depending on your genotype, this variant may have a modest to meaningful influence on muscle protein synthesis, growth factor signaling, and recovery capacity. Understanding your result gives you a personalized starting point for targeted lifestyle, dietary, and supplement strategies grounded in your unique biology.

Practical Foundations for Everyone

Regardless of your IGF1 rs35767 genotype, the following lifestyle inputs consistently support lean mass development, training adaptation, and physical performance. Carriers of the effect allele often notice a stronger return on these habits when applied consistently — which makes regularity more valuable than intensity.

  • Consistent nutrition: A whole-food dietary pattern rich in vegetables, quality protein, healthy fats, and fiber provides the micronutrient foundation that supports muscle growth-related pathways at a cellular level.
  • Regular movement: Physical activity — particularly a combination of aerobic exercise and resistance training — supports the metabolic signaling and growth factor pathways that interact with muscle growth and biological resilience.
  • Quality sleep: Restorative sleep is essential for cellular repair, hormone regulation, and the metabolic processes that underpin muscle growth and recovery. Consistent sleep timing amplifies the benefits of other lifestyle habits.
  • Stress management: Chronic stress elevates cortisol and inflammatory markers that can blunt the efficiency of pathways related to muscle growth. A daily stress-reduction practice — even five to ten minutes of slow breathing or mindfulness — helps maintain biological balance.

Diet Recommendations for IGF1 rs35767 and the IGF-1 LR3 Pathway

A targeted nutritional approach for the IGF1 rs35767 variant focuses on supplying the micronutrients and macronutrient balance that support muscle protein synthesis, growth factor signaling, and recovery capacity and reduce the metabolic burden on pathways connected to IGF-1 LR3. Priority nutrients vary by pathway but consistently center on anti-inflammatory whole foods, adequate protein for cellular and tissue support, and micronutrient density from colorful produce and quality fats.

The High Protein Diet is designed to support this pathway. A vegan meal plan delivering 100+ grams of daily protein from diverse plant sources to support muscle strength and energy....

Build meals around quality protein sources (fish, poultry, legumes, eggs), fiber-rich carbohydrates (vegetables, whole grains, legumes), and healthy fats (olive oil, avocado, nuts, seeds). Minimize ultra-processed foods, excessive added sugars, and alcohol — all of which increase oxidative and inflammatory burden on pathways that interact with muscle growth and IGF-1 LR3-related signaling.

Supplement Considerations for IGF1 rs35767 Support

Supplements cannot modify your IGF1 rs35767 genotype, but targeted supplementation can address nutritional gaps and support the biological pathways connected to IGF-1 LR3 and muscle growth and recovery. A foundations-first approach — prioritizing the basics before adding specialty products — produces the most consistent outcomes. Always discuss supplementation with your healthcare provider before starting, especially if you take medications or manage ongoing health conditions.

The PlexusDx Muscle Support is a personalized daily pack designed to support this pathway. PlexusDx Muscle Support is a personalized daily pack featuring creatine, BCAAs, and magnesium to help support muscle strength, recovery, and preservation. It promotes improved workout performance, reduced muscle fatigue, and healthy muscle function day to day....

Key nutrients commonly relevant to the Muscle Growth pathway include those that support muscle protein synthesis, growth factor signaling, and recovery capacity. Assess dietary gaps first; targeted supplementation is most valuable when it addresses a specific nutritional shortfall confirmed by food tracking or lab results rather than used as a substitute for consistent lifestyle habits.

Lifestyle Recommendations for Muscle Growth and IGF-1 LR3 Pathway Support

Consistent lifestyle habits are the most durable and evidence-supported way to reinforce the biological pathways associated with IGF-1 LR3 and muscle growth and recovery. For carriers of the IGF1 rs35767 effect allele, these habits tend to produce a more noticeable return because they directly influence the signaling environments where the variant has its greatest impact.

A practical weekly target is 150 minutes or more of moderate aerobic activity combined with two to three resistance training sessions. Sleep consistency — a fixed wake time, morning outdoor light, and a 60 to 90 minute wind-down before bed — supports cellular recovery and the hormonal balance that underpins muscle growth and recovery. Stress management practices such as slow breathing, mindfulness, or low-stimulation outdoor time help maintain the biological stability that IGF-1 LR3-related pathways depend on for efficient function. Avoiding chronic sleep debt, late-day caffeine, and excessive alcohol further removes common suppressors of muscle growth-related signaling.

Genetic Interpretations for rs35767 (IGF1)

2 Effect Alleles: GG (+/+)

You have the GG genotype for rs35767, which means you carry two copies of the effect allele in the IGF1 gene. This variation is associated with higher endogenous IGF-1 production and enhanced sensitivity to anabolic signaling pathways. In the context of the IGF-1 LR3 pathway, which is designed to extend and amplify IGF-1 activity, this genotype may support a particularly strong anabolic environment, promoting increased muscle protein synthesis, enhanced activation of muscle satellite cells, and more efficient tissue repair and regeneration. This may translate into improved recovery following exercise, greater potential for muscle hypertrophy, and more effective connective tissue remodeling. To support these pathways, a diet rich in high-quality protein, essential amino acids (especially leucine), and adequate caloric intake is important, along with nutrients that support anabolic and recovery processes such as creatine, vitamin D, zinc, and magnesium. Lifestyle strategies including progressive resistance training, structured recovery, hydration, and consistent high-quality sleep can help maximize the benefits of enhanced IGF-1 signaling and support long-term musculoskeletal performance.

1 Effect Allele: GA (+/-)

You have the GA genotype for rs35767, which means you carry one copy of the effect allele and one copy of the non-effect allele in the IGF1 gene. This intermediate genotype may be associated with moderate IGF-1 production and a balanced response to growth-factor signaling. In relation to the IGF-1 LR3 pathway, this suggests that extended IGF-1 activity can effectively support muscle growth, tissue repair, and metabolic recovery, while maintaining a stable and regulated anabolic environment. Individuals with this genotype may experience consistent improvements in muscle adaptation and recovery when supported by appropriate lifestyle factors. A balanced diet that includes adequate protein, healthy fats, and micronutrients, along with supplementation such as magnesium and vitamin D, may help maintain optimal endocrine function. Regular resistance training, proper recovery, hydration, and sleep optimization can further enhance tissue regeneration and support long-term muscle and connective tissue health.

0 Effect Alleles: AA (-/-)

You have the AA genotype for rs35767, which means you carry two copies of the non-effect allele in the IGF1 gene. This genotype is generally associated with typical or slightly lower endogenous IGF-1 production, which may result in a more modest anabolic response to growth-factor signaling. In the context of the IGF-1 LR3 pathway, this suggests that while extended IGF-1 activity can still support muscle repair and regeneration, the overall responsiveness of tissues to these signals may be somewhat reduced compared to higher-producing genotypes. Individuals with this genotype can still achieve meaningful improvements in muscle growth and recovery, but may benefit from more intentional support of anabolic pathways. Emphasizing a protein-rich diet with sufficient caloric intake, along with nutrients that support muscle function such as creatine, zinc, and vitamin D, may help optimize tissue repair. Lifestyle practices including consistent resistance training, progressive overload, adequate recovery time, and high-quality sleep are especially important for maximizing muscle adaptation and maintaining long-term structural resilience.

Inconclusive — No Result

Your genetic data for rs35767, a IGF1 gene variant, was not successfully called by the laboratory. This means the test did not detect a reliable result for this position, which can occur for technical reasons such as low signal intensity, DNA quality issues, or limitations of the genotyping array. Without a result, we cannot determine whether you carry the typical or effect variant for this gene. If this information is important for your health decisions, you may wish to consider retesting or confirming this variant through a targeted genetic test or sequencing method.

When to Talk to Your Healthcare Provider

If you have concerns related to muscle growth, the IGF-1 LR3 pathway, or how your IGF1 rs35767 results fit into your broader health picture, consult your healthcare provider. They can interpret your genetic results alongside your symptoms, health history, and lab values to guide appropriate testing, dietary adjustments, and supplementation where relevant.

PlexusDx provides genetic insights to help you understand how your genes may influence nutrient needs and biological pathways. This information is provided for educational and wellness purposes only and does not diagnose, treat, or recommend any specific medication, peptide, or therapy, some of which may be prescription-only, investigational, or intended for research use only. Always consult with a qualified healthcare provider before making changes to your supplement regimen, diet, or health plan based on genetic information.

Frequently Asked Questions About IGF1 rs35767 and IGF-1 LR3

What does the IGF1 rs35767 variant mean for my muscle growth and recovery?

The rs35767 variant in the IGF1 gene may influence how efficiently biological processes connected to IGF-1 LR3 and Muscle Growth function in your body. Depending on your genotype, this can have a modest to meaningful effect on muscle protein synthesis, growth factor signaling, and recovery capacity. Understanding your result gives you a personalized starting point for a targeted lifestyle and nutrition strategy grounded in your unique genetic biology.

How does the IGF-1 LR3 pathway relate to IGF1 and muscle growth and recovery?

IGF-1 LR3 is a peptide being studied for its potential role in supporting lean mass development, training adaptation, and physical performance. Researchers are interested in how IGF-1 LR3-associated pathways may interact with genes like IGF1, which contribute to the signaling environments that influence muscle growth function. The PlexusDx Precision Peptide Genetic Test analyzes 14 pathways, 49 peptides, and 150 genetic insights — including IGF1 rs35767 — to provide a comprehensive view of how your genetics may influence these interconnected systems.

Can lifestyle changes support IGF1 function regardless of my genotype?

Yes. Consistent lifestyle habits — regular exercise, quality sleep, anti-inflammatory nutrition, and stress management — support muscle growth-related biological pathways across all genotypes. For carriers of the effect allele at rs35767, these habits tend to produce a stronger measurable return because they directly reinforce the signaling environments where this variant has its greatest influence. Consistency and habit stacking — combining exercise, sleep, and nutrition improvements together — tends to produce better outcomes than any single change in isolation.

What tests can help me learn more about my muscle growth and recovery and the IGF-1 LR3 pathway?

The PlexusDx Precision Peptide Genetic Test analyzes 14 pathways, 49 peptides, and 150 genetic insights — including IGF1 rs35767 — to deliver a comprehensive picture of how your genetics may influence peptide-related health pathways. The Peptide Pathways 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.

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

🧬 Genetic Tests:

📄 Genetic Report:

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.