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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 Choline and the PEMT Gene

Choline is an essential nutrient that supports brain function, liver health, and the structure of cell membranes. Your body can make some choline internally, but not enough to meet total needs, so dietary choline is important. The PEMT gene codes for an enzyme that helps the liver produce a form of choline called phosphatidylcholine. Variations in the PEMT gene can lower the efficiency of this enzyme, increasing reliance on dietary choline to avoid deficiency.

How Your PEMT Genotype Affects Choline Production

The PEMT variant rs12325817 influences how well your liver can convert other molecules into phosphatidylcholine. Below is an easy-to-read explanation of what each genotype means for your internal choline production and practical steps you can take to support health.

2 effect alleles (GG) — Reduced PEMT activity

What this means

If your genotype is GG, you carry two copies of the effect allele. This is associated with reduced PEMT enzyme activity. Your liver makes less phosphatidylcholine via PEMT, so your body is more dependent on dietary choline.

Health implications

  • Higher risk of choline insufficiency if dietary intake is low
  • Potential effects on liver function and lipid transport when choline is inadequate
  • Possible impact on memory and cognitive function over time if needs are not met

Diet recommendations

  • Prioritize choline-rich foods daily: egg yolks, liver, fatty fish, soybeans and tofu, and cruciferous vegetables like broccoli and Brussels sprouts
  • Consider including at least one high-choline serving most days. One large egg yolk alone provides a substantial portion of daily needs
  • Balance meals with quality protein and healthy fats to support liver health and nutrient absorption

Supplement considerations

  • If dietary intake is inconsistent, a choline supplement such as choline bitartrate, CDP-choline, or alpha-GPC can help meet needs
  • Start with a modest supplemental dose and review with your healthcare provider, especially if pregnant, breastfeeding, or taking other medications

Lifestyle and monitoring

  • Limit alcohol intake because alcohol increases liver demand for choline and can worsen deficiency risk
  • Maintain a balanced diet, avoid prolonged very low calorie or fad diets, and support overall liver health
  • Discuss targeted blood testing with your provider if you have symptoms of liver dysfunction or unexplained cognitive changes
1 effect allele (CG) — Moderately reduced PEMT activity

What this means

If your genotype is CG, you carry one copy of the effect allele. This is associated with a modest reduction in PEMT enzyme efficiency. Your liver still produces choline, but less effectively than someone with two non-effect alleles.

Health implications

  • Slightly higher likelihood of choline insufficiency if dietary intake is inadequate
  • May benefit from a diet with regular sources of choline to support brain and liver function

Diet recommendations

  • Include choline-rich foods regularly: eggs, fish, soy products, legumes, nuts, and cruciferous vegetables
  • Aim for a mix of animal and plant sources if possible, to balance choline intake and other nutrients

Supplement considerations

  • Supplements can be helpful if you do not eat choline-rich foods consistently, especially during life stages with higher need
  • Discuss dose and timing with your healthcare provider before starting supplements

Lifestyle and monitoring

  • Support liver health with moderate alcohol consumption and a balanced diet
  • Monitor for signs of low choline, such as persistent fatigue, memory issues, or elevated liver enzymes if testing has been done
0 effect alleles (CC) — Typical PEMT activity

What this means

If your genotype is CC, you carry two copies of the non-effect allele. This is associated with typical PEMT enzyme function. Your liver is likely efficient at making phosphatidylcholine from precursor molecules.

Health implications

  • Standard capacity for internal choline synthesis
  • Still requires dietary choline since the nutrient is essential

Diet recommendations

  • Continue to include choline-containing foods: eggs, fish, soy, legumes, and cruciferous vegetables
  • A varied diet typically meets choline needs in people with normal PEMT function

Supplement considerations

  • Supplements are usually not necessary if you eat a balanced diet with regular choline sources
  • Consider supplementation only if dietary restrictions limit choline intake or if advised by your provider

Lifestyle and monitoring

  • Continue healthy behaviors that support liver and brain health
  • Routine monitoring is not typically required unless there are symptoms or other risk factors

Practical Tips to Optimize Choline Intake

  • Meal planning: add an egg or a portion of fatty fish a few times per week, or include tofu, edamame, or legumes as plant-based choline sources
  • Cooking ideas: incorporate chopped egg yolk into salads, enjoy salmon or sardines, add cooked soybeans to grain bowls, and include steamed broccoli regularly
  • Alcohol moderation: keep alcohol intake low to reduce strain on liver choline demand
  • Life stages: pregnancy and breastfeeding increase choline need. If you are pregnant, planning pregnancy, or breastfeeding, discuss intake and testing with your healthcare provider

When to Talk With Your Healthcare Provider

  • If you have a history of liver disease, unexplained elevated liver enzymes, or cognitive concerns
  • If you follow a restrictive diet that limits choline-rich foods, such as strict veganism without attention to soy and legumes
  • Before starting any supplement, especially during pregnancy or if you take medications
  • If you want targeted blood tests or personalized nutritional planning

Important Disclaimer

PlexusDx does not provide medical advice. This information is educational and describes genetic tendencies related to PEMT and choline metabolism. Always consult your healthcare provider before making changes to your diet, supplements, or medical care based on genetic results.

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 Choline and PEMT rs12325817

What does the PEMT rs12325817 variant mean for my choline needs?

The PEMT gene helps your liver produce phosphatidylcholine, a choline-related form needed for normal cell membrane structure and liver/brain health. The rs12325817 variant can reduce PEMT enzyme efficiency, meaning you may rely more on dietary choline to help prevent insufficiency—especially if your intake is low.

How do the rs12325817 genotypes (CC, CG, GG) change choline production?

CC (0 effect alleles) is associated with typical PEMT activity, so internal choline production is usually more efficient. CG (1 effect allele) is linked to moderately reduced activity, which may slightly increase the likelihood of insufficiency if dietary choline is inadequate. GG (2 effect alleles) is associated with reduced PEMT activity, increasing reliance on dietary choline to meet needs and support liver function and long-term cognitive health.

What should I do to optimize choline intake based on my PEMT results?

Prioritize choline-rich foods such as egg yolks, liver, fatty fish, soy/tofu, and cruciferous vegetables (like broccoli and Brussels sprouts). If you can’t consistently meet needs through diet—or if you’re in a higher-need life stage (pregnancy or breastfeeding)—a choline supplement (choline bitartrate, CDP-choline, or alpha-GPC) may help, but discuss dose and safety with your healthcare provider first. Also keep alcohol intake low to reduce strain on liver choline demand.

What tests can help me learn more about Choline and PEMT rs12325817?

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.