Methylmercury (MeHg) is the biomagnified organometallic form of mercury that dominates dietary exposure in populations consuming fish. Methylmercury is a known developmental neurotoxicant; the literature on fetal and early-childhood exposure is extensive and forms the basis of advisories in most jurisdictions. Large predatory fish (shark, swordfish, king mackerel, bigeye tuna, tilefish) and marine mammals are the principal food-system sources. The distinction between methylmercury and total mercury is maintained throughout this wiki because methylmercury drives the health interpretation in dietary contexts; see mercury, total for the companion page.
Ufelle & Barchowsky 2021 supports this species page with textbook-level context on aquatic methylation, biomagnification, gastrointestinal absorption, blood-brain-barrier and placental transfer, fecal elimination, neurotoxicity, and treatment strategies that interrupt enterohepatic cycling. It is a toxicology source, not a food occurrence dataset.
Status
This page is a stub. Substantive content awaits corpus ingest. See methodology for the current state of the project.
Planned sections
Toxicology, typical exposure routes, fish-species concentration ranges (linked to ingredients), regulatory and advisory instruments (linked to regulations), testing methods including speciation (linked to testing), microbiome effects (linked to microbiome), vulnerable populations, open questions, and sources.
Sources
Auto-generated from source-page frontmatter. The “Used on this page for” column is populated by the orchestrator’s POPULATE-SOURCE-LEGEND action; pending entries appear as *[awaiting synthesis]*.
| # | Citation | Year | Type | Used on this page for |
|---|---|---|---|---|
| 1 | Kim et al. 2026. Combined exposure to lead, methylmercury, and cadmium impairs spatial memory and dopaminergic signaling in mouse hippocampus, Frontiers in Public Health | 2026 | Peer-reviewed | MeHg data: Fifty male ICR mice were divided into five groups and exposed for 28 days via drinking water to lead (25 mg/L as lead acetate), methylmercury (10 mg/L as methylmercury chloride)… |
| 2 | Lepak et al. 2026. Quantifying Depuration of Methylmercury from Fish Consumption by Travelers, Environmental Health | 2026 | Peer-reviewed | MeHg depuration rates after fish consumption: half-life data and implication for exposure modelling |
| 3 | Rusko et al. 2026. Risk-Benefit Assessment of Mercury, Lead, Cadmium, and Arsenic in Inland Fish from Latvian Lakes, Foods | 2026 | Peer-reviewed | MeHg concentrations in freshwater fish (n=460) |
| 4 | WHO 2026. GEMS/Food Contaminants database heavy-metal exports, GEMS/Food Contamination Monitoring and Assessment Programme | 2026 | Government dataset | WHO GEMS/Food contaminants database: global MeHg occurrence monitoring data across food commodities |
| 5 | Wu et al. 2026. Whole-Cell Biosensor for Sensitive Detection of Methylmercury in Environmental Water, Biosensors and Bioelectronics | 2026 | Peer-reviewed | Analytical sensor for MeHg detection in aqueous/environmental matrices, cited for analytical-methods context |
| 6 | Auzier et al. 2025. Systematic review and spatiotemporal assessment of mercury concentration in fish from the Tapajós River Basin: implications for environmental and human health, ACS Environmental Au | 2025 | Peer-reviewed | Systematic review of MeHg in fish muscle: synthesised occurrence, health effects, and exposure data |
| 7 | Carter et al. 2025. Thermal Decomposition Amalgamation AAS and SALLE for Methylmercury and Total Mercury in Finfish: FDA Method Validation | 2025 | Peer-reviewed | MeHg concentrations in fish muscle by AAS |
| 8 | Dietz et al. 2025. Stable isotopes unveil ocean transport of legacy mercury into Arctic food webs, Nature Communications | 2025 | Peer-reviewed | [awaiting synthesis] |
| 9 | Jermilova et al. 2025. Assessing mercury exposure to water and fish of the Mackenzie watershed using a Bayesian network analysis, Integrated Environmental Assessment and Management | 2025 | Peer-reviewed | MeHg concentrations in fish and seafood (n=1044) |
| 10 | Lepak et al. 2025. Correction: Mercury Concentrations in Sport Fish from Colorado Reservoirs, PLOS ONE | 2025 | Peer-reviewed | MeHg concentrations in freshwater fish |
| 11 | Seyfferth et al. 2025. Concentrations and Health Implications of As, Hg, and Cd and Micronutrients in Rice and Emissions of CH4 From Variably Flooded Paddies, GeoHealth | 2025 | Peer-reviewed | MeHg concentrations in rice bran (n=6) |
| 12 | Taylor et al. 2025. Seafood Benefits and Contaminants: A Comprehensive Review of Health Impacts, Safety Concerns, and Risk Mitigation Strategies, Foods | 2025 | Peer-reviewed | MeHg concentrations in fish and seafood |
| 13 | Thoerig et al. 2025. Assessment of arsenic, cadmium, lead, mercury, and per- and polyfluoroalkyl substances concentrations in human milk and infant formula in the United States: a systematic review, American Journal of Clinical Nutrition, Vol. 122, pp. 1006-1026 | 2025 | Peer-reviewed | Systematic review of MeHg in infant formula: synthesised occurrence, health effects, and exposure data |
| 14 | Wu et al. 2025. Climate change amplifies neurotoxic methylmercury threat to Asian fish consumers, Proceedings of the National Academy of Sciences | 2025 | Peer-reviewed | [awaiting synthesis] |
| 15 | Zhou et al. 2025. Microbial potential to mitigate neurotoxic methylmercury accumulation in farmlands and rice, Nature Communications | 2025 | Peer-reviewed | [awaiting synthesis] |
| 16 | ATSDR 2024. Toxicological Profile for Mercury, U.S. Department of Health and Human Services, Public Health Service, Agency for Toxic Substances and Disease Registry | 2024 | Government report | ATSDR toxicological profile for mercury2024 cited for comparative context on the methylmercury page |
| 17 | Barquero et al. 2024. A preliminary assessment of mercury, methylmercury and other potentially toxic elements in largemouth bass (Micropterus salmoides) from the Almadén mining district, Environmental Geochemistry and Health | 2024 | Peer-reviewed | [awaiting synthesis] |
| 18 | Codex 2024. Report of the 17th Session of the Codex Committee on Contaminants in Foods (REP24/CF17), Joint FAO/WHO Food Standards Programme, Codex Alimentarius Commission | 2024 | Government report | Codex CCCF 2024 deliberations: MeHg maximum level amendments and new commodity inclusions |
| 19 | Eccles et al. 2024. Non-invasive biomonitoring of polar bear feces can be used to estimate concentrations of metals of concern in traditional food, PLOS ONE | 2024 | Peer-reviewed | [awaiting synthesis] |
| 20 | Escobar-Camacho et al. 2024. Mercury in aquatic ecosystems of two indigenous communities in the Piedmont Ecuadorian Amazon: evidence from fish, water, and sediments, Environmental Science and Pollution Research | 2024 | Peer-reviewed | [awaiting synthesis] |
| 21 | Kanazawa 2024. Mercury speciation in artisanal small-scale gold mining (ASGM) environments in Kenya, unknown | 2024 | Peer-reviewed | MeHg data: Mercury speciation including total Hg and methylmercury (MeHg) was measured in environmental matrices (soil, water, sediment) from artisanal small-scale gold mining (ASGM) areas… |
| 22 | Li et al. 2024. Global fishing patterns amplify human exposures to methylmercury, Proceedings of the National Academy of Sciences | 2024 | Peer-reviewed | [awaiting synthesis] |
| 23 | Tatsuta et al. 2024. Dietary intake of methylmercury by 0-5 years children using the duplicate diet method in Japan, Environmental Health and Preventive Medicine | 2024 | Peer-reviewed | MeHg data: This duplicate-diet study measured total mercury and methylmercury in diets consumed by Japanese children aged 0-5 years. |
| 24 | Al-Sulaiti et al. 2023. Health risk assessment of methyl mercury from fish consumption in a sample of adult Qatari residents, Environmental Science and Pollution Research | 2023 | Peer-reviewed | [awaiting synthesis] |
| 25 | Coe et al. 2023. Assessing the Role of the Gut Microbiome in Methylmercury Demethylation and Elimination in Humans and Gnotobiotic Mice, Archives of Toxicology, Vol. 97, pp. 2399-2418 | 2023 | Peer-reviewed | MeHg microbial methylation/demethylation: gut microbiota roles in speciation and bioaccessibility |
| 26 | Martinez-Morata et al. 2023. A State-of-the-Science Review on Metal Biomarkers, Current Environmental Health Reports, Vol. 10, No. 3, pp. 215-249 | 2023 | Peer-reviewed | State-of-the-science review on metal biomarkers: blood, urine, and tissue matrices for MeHg exposure assessment |
| 27 | Suomi et al. 2023. Cumulative risk assessment of the dietary heavy metal and aluminum exposure of Finnish adults, Environmental Science and Pollution Research | 2023 | Peer-reviewed | [awaiting synthesis] |
| 28 | Bair 2022. A Narrative Review of Toxic Heavy Metal Content of Infant and Toddler Foods and Evaluation of United States Policy, Frontiers in Nutrition 9:919913 | 2022 | Peer-reviewed | Systematic review of MeHg in infant cereal: synthesised occurrence, health effects, and exposure data |
| 29 | FDA 2022. Total Diet Study Report: Fiscal Years 2018-2020 Elements Data, U.S. Food and Drug Administration, Total Diet Study Program | 2022 | Government report | FDA Total Diet Study FY2018-2020: MeHg concentrations and estimated dietary exposures across commercial food categories |
| 30 | Balali-Mood et al. 2021. Toxic Mechanisms of Five Heavy Metals: Mercury, Lead, Chromium, Cadmium, and Arsenic, Frontiers in Pharmacology 12:643972 | 2021 | Peer-reviewed | Multi-metal toxicology review covering MeHg: oxidative stress, DNA damage, enzyme inhibition, and carcinogenic mechanisms |
| 31 | Rothenberg et al. 2021. Maternal methylmercury exposure through rice ingestion and child neurodevelopment in the first three years: a prospective cohort study in rural China, Environmental Health, Vol. 20, Article 50 | 2021 | Peer-reviewed | MeHg concentrations in rice and rice products |
| 32 | Stanton et al. 2021. The Metallome as a Link Between the Omes in Autism Spectrum Disorders, Frontiers in Molecular Neuroscience 14:695873 | 2021 | Peer-reviewed | MeHg dyshomeostasis in neurodevelopmental conditions: metallome dysregulation context |
| 33 | Zealand 2019. 25th Australian Total Diet Study, Food Standards Australia New Zealand | 2019 | Government report | Food Standards Australia New Zealand: MeHg occurrence and dietary exposure from the 25th Total Diet Study |
| 34 | FDA 2017. Advice About Eating Fish — For Those Who Might Become or Are Pregnant or Breastfeeding and Children Ages 1 to 11 Years, U.S. FDA and U.S. EPA | 2017 | Government report | FDA/EPA fish consumption advice: MeHg exposure thresholds and guidance for pregnant women and vulnerable populations |
| 35 | C-C et al. 2016. Methylmercury varies more than one order of magnitude in commercial European rice, Food Chemistry | 2016 | Peer-reviewed | MeHg concentrations in rice flour (n=87) |
| 36 | Ralston et al. 2014. Selenium Health Benefit Values: Updated Criteria for Mercury Risk Assessments, Archives of Environmental Contamination and Toxicology | 2014 | Peer-reviewed | MeHg concentrations and health risk assessment in seafood |
| 37 | Carroquino et al. 2013. Environmental Toxicology: Children at Risk, Encyclopedia of Sustainability Science and Technology, Chapter 11 (Springer) | 2013 | Peer-reviewed | Toxicology reference text on methylmercury: mechanisms of toxicity, target organs, and clinical manifestations |
| 38 | Programme 2013. Minamata Convention on Mercury — Text and Annexes (2024 Edition), United Nations Environment Programme, Secretariat of the Minamata Convention on Mercury | 2013 | Government report | Minamata Convention on Mercury (2013): global treaty framework, mercury phase-down schedules, and food safety regulatory context |
| 39 | EFSA 2012. Scientific Opinion on the Risk for Public Health Related to the Presence of Mercury and Methylmercury in Food, EFSA Journal 2012;10(12):2985 | 2012 | Government report | EFSA 2012 scientific opinion on MeHg: PTWI of 1.3 µg/kg bw/week, neurological-endpoint dose-response, and dietary exposure from fish |
| 40 | Farina et al. 2011. Mechanisms of Methylmercury-Induced Neurotoxicity: Evidence from Experimental Studies, Life Sciences 89(15-16):555-563 | 2011 | Peer-reviewed | MeHg toxicological mechanisms, target organ effects, and dose-response evidence |
| 41 | JECFA 2011. Evaluation of Certain Contaminants in Food: Seventy-second Report of the Joint FAO/WHO Expert Committee on Food Additives (Lead, among others), WHO Technical Report Series 959 | 2011 | Government report | JECFA 72nd evaluation of lead: BMDL01 approach, withdrawal of PTWI, context for MeHg comparative regulatory standards |
| 42 | JECFA 2004. Evaluation of Certain Food Additives and Contaminants (Methylmercury), 61st Meeting of JECFA, WHO Technical Report Series 922 | 2004 | Government report | JECFA 61st evaluation of MeHg: PTWI of 1.6 µg/kg bw/week for neurological endpoints and fish-consumption exposure basis |
| 43 | EPA 2001. Methylmercury (MeHg) — IRIS Chemical Assessment Summary, U.S. Environmental Protection Agency, Integrated Risk Information System | 2001 | Government report | EPA IRIS toxicological review for methylmercury: oral reference dose, inhalation unit risk, and dose-response derivation |
| 44 | Codex 1995. General Standard for Contaminants and Toxins in Food and Feed (CXS 193-1995), Codex Alimentarius (Joint FAO/WHO Food Standards Programme) | 1995 | Government report | Codex General Standard for Contaminants (CXS 193): MeHg maximum levels across food commodities |