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.

Iodine: A Critical Biomarker for Thyroid Health

Iodine functions as a critical biomarker that affects both the operation and development of the thyroid. Different populations show varying iodine levels which may result in thyroid health problems. The essential element functions as a key component in health domains such as thyroid function, pregnancy maintenance, and cognitive abilities. This blog post will explore the significance of iodine as well as its dietary sources and the genetic factors that affect iodine levels in individuals.

Evidence and Explanation

The essential element iodine facilitates thyroid hormone production which regulates metabolism and multiple body functions. Adequate iodine intake maintains thyroid function and is essential for healthy pregnancies and cognitive development. Seaweed and enriched bread together with fish such as cod and dairy products along with iodized salt serve as excellent iodine sources within the diet. Health professionals advise adults to intake approximately 150 micrograms of iodine daily to fulfill their physiological requirements. Excessive iodine consumption can cause harm even though insufficient iodine levels lead to negative health consequences. Individuals should only pursue iodine supplementation after receiving professional medical guidance and confirming an iodine deficiency. Individual iodine levels can be affected by genetic factors. The "G" variant at the rs1050450 locus on the GPX1 gene correlates with individuals having diminished iodine levels. The GPX1 gene serves dual functions by participating in thyroid hormone synthesis and providing antioxidant protection. These genetic findings require careful interpretation because they originate from limited research. An individual's iodine status can be affected by their diet alongside environmental exposures and other genetic variants.

Practical Advice

  1. Make sure your diet includes foods that are high in iodine like seaweed, fish, dairy products and iodized salt.
  2. Before starting iodine supplements you should get advice from a healthcare professional particularly if you think you may have a deficiency.
  3. Avoid over-supplementing with iodine because too much of it can harm your thyroid health.
  4. Understand your genetic factors that affect iodine levels but recognize genetics represent only one aspect of the complex equation.

Conclusion

Iodine remains essential for the proper functioning of the thyroid and general health maintenance. Individuals who learn about iodine's importance and make educated food choices while recognizing genetic factors can actively support their health. The Precision Health & Wellness tests from PlexusDx offer valuable insights into your genetic predispositions regarding iodine levels as well as other important health indicators. You can find personalized health reports at PlexusDx.com, Amazon or Walmart that will help you on your wellness journey. Your health relies on multiple interacting elements and genetic information needs to serve as an educational resource rather than replacing professional medical guidance. Maintain control over your health by staying informed and partnering with healthcare professionals to make well-informed choices. PlexusDx offers personalized health insights that can guide you towards optimized well-being on your health journey.

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.

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