HSA | FSA CARDS ARE NOW ACCEPTED

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.

How Genetics and Environment Shape Skin Aging

Skin aging results from a mix of genetic and environmental factors that lead to wrinkles, loss of elasticity, and age spots. A central process behind many of these changes is oxidative stress. Over time, oxidative stress damages collagen and other components of the skin matrix, reducing firmness and resilience.

The MC1R gene plays a key role in how skin responds to sunlight. MC1R helps regulate production of eumelanin, the darker pigment that provides natural protection against ultraviolet radiation. Variations in MC1R can reduce eumelanin production, making skin more vulnerable to UV damage and accelerating photoaging. Even with a lower-risk MC1R genotype, environmental factors such as sun exposure, smoking, and pollution can still strongly influence how your skin ages.

Ways to Support Skin Health

  • Daily sun protection: broad-spectrum sunscreen, protective clothing, wide-brim hats, and seeking shade during peak UV hours.
  • Diet rich in antioxidants: colorful fruits and vegetables high in vitamin C, vitamin E, carotenoids, and polyphenols help neutralize free radicals and support collagen synthesis.
  • Targeted supplements: consider evidence-backed options such as astaxanthin, green tea extract (EGCG), vitamin C, and collagen peptides to support skin resilience.
  • Avoid smoking: tobacco accelerates oxidative damage, breaking down collagen and elastin.
  • Reduce pollution exposure where possible: air pollutants increase oxidative stress and inflammation in the skin.
  • Supportive skincare: topical vitamin C, retinoids or retinol alternatives, and moisturizers with ceramides can help maintain barrier function and stimulate collagen production.
  • Healthy lifestyle: adequate sleep, stress management, regular exercise, and maintaining healthy blood sugar levels support overall skin repair and recovery.

Practical Supplement and Diet Suggestions

  • Vitamin C: eat citrus, berries, kiwi, bell peppers, and leafy greens. Consider an oral vitamin C supplement if dietary intake is low.
  • Astaxanthin: a potent antioxidant that may reduce photoaging and improve skin elasticity. Typical study doses range from 4 to 12 mg daily.
  • Green tea extract: provides polyphenols such as EGCG that protect against UV-induced damage and reduce inflammation. Consistent intake from brewed tea or standardized supplements is common.
  • Collagen peptides: supplemental collagen may support skin hydration and reduce wrinkle depth when taken regularly.
  • Omega-3 fatty acids: fatty fish, flax, chia, or fish oil supplements support barrier health and reduce inflammation.

Genetic Interpretation: MC1R rs1805005

2 effect alleles — TT genotype

You carry two copies of the effect allele (TT) at rs1805005. This genotype is associated with increased photoaging risk. Your MC1R variation may reduce production of eumelanin, the protective pigment that helps shield skin from UV damage. With less natural UV defense, your skin is more vulnerable to sun-induced damage that accelerates collagen breakdown and visible signs of aging such as wrinkles and uneven pigmentation.

Actionable steps

  • Sun protection: apply broad-spectrum sunscreen daily with at least SPF 30, reapply every two hours while outdoors, use UPF clothing, and seek shade.
  • Antioxidant support: prioritize vitamin C rich foods, consider astaxanthin (4 to 12 mg/day) and green tea extract to counter oxidative stress.
  • Collagen support: include collagen peptides and dietary protein to provide amino acids for repair.
  • Behavioral habits: avoid smoking, reduce pollution exposure when possible, and practice regular skin-care that includes topical antioxidants and retinoids as tolerated.
  • Monitoring: regular skin checks and protective dermatology care if you notice unusual spots or changes in pigmentation.
1 effect allele — GT genotype

You carry one copy of the effect allele (GT) at rs1805005. This genotype is associated with likely increased photoaging compared to non-effect carriers. Your MC1R variant may modestly reduce eumelanin production, making your skin somewhat more susceptible to UV-induced damage and collagen breakdown.

Actionable steps

  • Sun protection: make daily sunscreen and protective clothing a routine to limit cumulative UV exposure.
  • Diet and supplements: increase antioxidant-rich foods, ensure consistent vitamin C intake, and consider supplements such as astaxanthin and green tea extract. Collagen peptides can support skin structure.
  • Lifestyle: avoid smoking, reduce direct pollution exposure where possible, and maintain good sleep and stress practices to support skin repair.
  • Topical care: incorporate topical vitamin C and a retinoid or retinol alternative to support collagen production and reduce visible signs of aging.
0 effect alleles — GG genotype

You carry two copies of the non-effect allele (GG) at rs1805005. This genotype is associated with typical skin aging patterns. Your MC1R functions normally, allowing adequate eumelanin production when the receptor is activated. This gives your skin a better innate defense against UV damage compared to reduced-function variants.

Actionable steps

  • Maintain sun-safe habits: even with normal MC1R function, cumulative UV exposure, smoking, and pollution are major drivers of skin aging.
  • Balanced diet: continue a diet rich in fruits and vegetables to provide antioxidants that protect collagen and elastin.
  • Supportive supplements: consider collagen peptides, vitamin C, and omega-3s if dietary intake is insufficient.
  • Skin care: use daily sunscreen and incorporate topical antioxidants and moisturizers that support barrier health.
  • Regular checks: monitor skin changes and consult a dermatologist for routine skin health evaluations.

When to Talk to a Healthcare Provider

Genetic information can help you personalize prevention and self-care, but it is not a diagnosis. Discuss any concerns about skin changes, persistent lesions, or questions about supplements and medications with your healthcare provider. They can integrate your genetic results with medical history and recommend appropriate testing or treatments.

PlexusDx does not provide medical advice. The information in this article is educational only. Always consult your healthcare provider before starting or stopping any supplement, medication, or significant lifestyle change.

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 SKIN AGING and MC1R rs1805005

How does the MC1R rs1805005 variant affect skin aging?

The MC1R gene influences how your skin responds to sunlight by regulating eumelanin, the pigment that helps protect against ultraviolet (UV) damage. If your PlexusDx results show MC1R rs1805005 effect alleles (TT or GT), your skin may produce less eumelanin, making it more vulnerable to photoaging—such as wrinkles and uneven pigmentation—because UV damage can more easily contribute to collagen breakdown and oxidative stress. If you have no effect alleles (GG), your MC1R function is typically more normal and you generally have stronger innate protection from UV-induced damage.

What skin care and lifestyle steps matter most if I have an MC1R rs1805005 effect allele?

Because reduced eumelanin can increase susceptibility to UV damage, daily sun protection is the highest-impact habit: use broad-spectrum sunscreen (at least SPF 30), reapply about every two hours when outdoors, wear protective clothing, and seek shade during peak UV hours. You can also help counter oxidative stress with antioxidant support (e.g., vitamin C–rich foods and options like astaxanthin and green tea extract), support skin structure with adequate dietary protein and collagen peptides, and reduce additional oxidative triggers such as smoking and unnecessary pollution exposure.

Can antioxidants, collagen peptides, and retinoids help regardless of my MC1R rs1805005 genotype?

Yes. While MC1R rs1805005 can influence your baseline UV protection, oxidative stress and environmental exposure still drive skin aging for everyone. A consistent routine that includes antioxidant-rich nutrition (vitamin C, vitamin E, carotenoids, and polyphenols), supportive supplements if dietary intake is low (such as astaxanthin, EGCG/green tea extract, omega-3s, and collagen peptides), and barrier-supportive skincare (like topical vitamin C and retinoids or retinol alternatives) can help support collagen resilience and reduce wrinkle depth over time. Even with typical MC1R function, sunscreen, healthy lifestyle habits (sleep, stress management, exercise), and avoiding smoking and excess pollution exposure remain important.

What tests can help me learn more about SKIN AGING and MC1R rs1805005?

The Longevity and Healthy Aging Genetic Test delivers over 200 genetic insights related to cellular repair, inflammation balance, metabolism, cardiometabolic health, and aging pathways. The Healthy Aging 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.