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 BCO1 and Vitamin A Work

Vitamin A is essential for vision, immune function, skin health, and healthy cell growth. It is available as preformed Vitamin A (retinol) from animal foods and as beta-carotene from plant foods. The body converts beta-carotene into active Vitamin A using an enzyme made by the BCO1 gene. Genetic differences in BCO1 can change how efficiently beta-carotene is converted, affecting how much usable Vitamin A you get from plant sources.

What this means for your health

  • If conversion is reduced, you may rely more on animal sources of preformed Vitamin A to meet needs.
  • Beta-carotene-rich foods still offer important antioxidants and other nutrients, even if conversion is slower.
  • Because Vitamin A is fat-soluble, eating plant sources with healthy fats and using cooking methods that increase absorption can help.

Genetic Interpretations

Two effect alleles (TT for rs7501331)

If you have the TT genotype for rs7501331, which means you carry two copies of the effect allele. This genetic variation in your BCO1 gene means your body may be less efficient at converting beta-carotene from plant foods into active Vitamin A (retinol). While you can still convert beta-carotene, the process may be slower compared to others. To support adequate Vitamin A levels, consider including preformed Vitamin A sources like eggs, dairy, and liver alongside colorful vegetables. Since beta-carotene is fat-soluble, pair plant foods with healthy fats like olive oil or avocados to enhance absorption. Continue eating beta-carotene-rich foods for their additional health benefits beyond Vitamin A.

One effect allele (CT for rs7501331)

If you have the CT genotype for rs7501331, which means you carry one copy of the effect allele. This genetic variant in your BCO1 gene is associated with likely decreased beta-carotene conversion to the active form of Vitamin A. Your body may be less efficient at transforming beta-carotene from colorful plant foods like carrots and sweet potatoes into usable Vitamin A (retinol). This doesn't mean you can't convert beta-carotene at all, but the process may be slower compared to those without this variant. To support adequate Vitamin A levels, consider including preformed Vitamin A sources such as eggs, dairy, and liver alongside your beta-carotene-rich vegetables. Pairing plant foods with healthy fats can enhance absorption, as beta-carotene is fat-soluble.

No effect alleles (CC for rs7501331)

If you have the CC genotype for rs7501331, which means you carry two copies of the non-effect allele. This genotype is associated with typical beta-carotene conversion efficiency. Your BCO1 gene produces the enzyme that converts plant-based beta-carotene into active Vitamin A at a normal rate. This means your body can effectively transform the beta-carotene from colorful fruits and vegetables like carrots, sweet potatoes, and spinach into the active Vitamin A it needs. Continue eating a balanced diet that includes both beta-carotene-rich plant foods and preformed Vitamin A from animal sources like eggs, dairy, and fish to support your vision, immune function, and overall health.

Practical Dietary Recommendations

Use these simple strategies to support healthy Vitamin A status regardless of genotype.

  • Include preformed Vitamin A sources regularly: liver (small portions), eggs, full-fat dairy, and fatty fish. These provide retinol directly and bypass conversion requirements.
  • Eat a variety of colorful fruits and vegetables: carrots, sweet potatoes, butternut squash, spinach, kale, and red peppers are rich in beta-carotene and other beneficial carotenoids.
  • Combine plant sources with healthy fats: add olive oil, avocado, nuts, seeds, or full-fat dairy to meals to improve beta-carotene absorption.
  • Cook some beta-carotene-containing vegetables: light cooking or pureeing can release carotenoids and increase bioavailability compared with raw forms.
  • Balance portion sizes of liver and high-retinol foods: preformed Vitamin A accumulates in the body, so avoid excessive intake, especially during pregnancy.

Supplement and Nutrient Considerations

  • Multivitamin or targeted Vitamin A supplements can help if dietary intake is low, but speak with your healthcare provider before starting any supplement.
  • For those with reduced conversion, consider supplements containing preformed Vitamin A or a mixed carotenoid formula that includes some retinol, under medical guidance.
  • Be cautious with high-dose Vitamin A supplements, particularly during pregnancy. Too much preformed Vitamin A can be harmful.
  • Supportive nutrients: adequate dietary fat, protein, and zinc are important for Vitamin A transport and function. Consider evaluating overall nutrient status if concerns arise.

Lifestyle and Cooking Tips

  • Cook vegetables briefly rather than overcooking to maximize nutrient retention and carotenoid availability.
  • Add a fat source to salads and cooked veggies—olive oil, nut-based dressings, or avocado work well.
  • Include both raw and cooked preparations across the week to capture different nutrient profiles.
  • Maintain a balanced overall diet that supports digestive health, since healthy digestion and bile flow aid fat-soluble vitamin absorption.

Recommended Blood Tests and Monitoring

  • Serum retinol: measures circulating Vitamin A status, helpful if you have symptoms or dietary risk factors.
  • Complete nutrition panel: to assess related nutrients like zinc and markers of liver function before changing supplement routines.
  • Discuss testing cadence with your healthcare provider if you plan on taking preformed Vitamin A supplements, especially in higher doses.

When to Talk to a Healthcare Provider

Consult your healthcare provider if you have symptoms of Vitamin A deficiency (night vision issues, dry eyes, or dry skin) or if you are pregnant, breastfeeding, have liver disease, or take medications that interact with Vitamin A. Your provider can help interpret genetic results in context, recommend blood testing, and advise safe supplementation or dietary changes.

Final Notes and Disclaimer

PlexusDx provides educational information about genetic predispositions only. This content is not medical advice. Always consult your healthcare provider before making changes to your diet, supplements, or medical care based on genetic information.

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 Vitamin A and BCO1 rs7501331

How does the BCO1 rs7501331 variant affect vitamin A from plant foods?

The BCO1 gene helps convert beta-carotene (from plants) into active vitamin A (retinol). If you have effect alleles for rs7501331, your body may convert beta-carotene less efficiently, meaning you could get less usable vitamin A from carrots, sweet potatoes, and other colorful plants compared with people with the typical (CC) genotype.

What should I eat if I have one or two effect alleles (CT or TT) for rs7501331?

If conversion may be reduced, consider including preformed vitamin A sources more regularly (such as eggs, dairy, and liver) alongside beta-carotene-rich vegetables. Because beta-carotene is fat-soluble, pairing plant foods with healthy fats (olive oil, avocado, nuts, seeds, or full-fat dairy) can improve absorption. Continue eating a variety of colorful produce for antioxidants and other carotenoids, even if conversion is slower.

When is it important to consider blood testing or supplements for vitamin A?

If you have symptoms of vitamin A deficiency (like night vision issues, dry eyes, or dry skin) or have higher risk factors (pregnancy/breastfeeding, liver disease, or medication interactions), talk to your healthcare provider. They may suggest serum retinol to check vitamin A status and a complete nutrition panel to assess related nutrients (such as zinc and liver markers) before changing supplements. Be cautious with high-dose preformed vitamin A—especially during pregnancy—and only supplement under medical guidance.

What tests can help me learn more about Vitamin A and BCO1 rs7501331?

The Optimal Diet and Weight Loss Genetic Test delivers over 295 genetic insights related to nutrition response, body composition, metabolism, and fitness. The Diet and Nutrition 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.