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Even picogram levels of lead can alter your brain’s epigenome for life, rewriting gene expression without changing your DNA, and these effects may be passed on to your children and grandchildren. doi:10.1038/srep14466
Lead is a neurotoxic heavy metal with no safe exposure level. It contaminates food, consumer goods and drinking water, causing cognitive deficits, birth defects and cardiovascular disease. HMTC’s rigorous lead testing applies ALARA principles to protect infants and consumers and to prepare brands for tightening regulations.
Karen Pendergrass is a researcher specializing microbial metallomics and microbiome signatures, with a focus on bridging research and clinical practice. She is the co-founder of several initiatives, including Microbiome Signatures and the Heavy Metal Tested & Certified program, which translate complex science into actionable standards.
Divine Aleru is an accomplished biochemist and researcher with a specialized background in environmental toxicology, focusing on the impacts of heavy metals on human health. With deep-rooted expertise in microbiome signatures analysis, Divine seamlessly blends rigorous scientific training with her passion for deciphering the intricate relationships between environmental exposures and the human microbiome. Her career is distinguished by a commitment to advancing integrative health interventions, leveraging cutting-edge microbiome research to illuminate how toxic metals shape biological systems. Driven by curiosity and innovation, Divine is dedicated to translating complex environmental findings into actionable insights that improve individual and public health outcomes.
Our team of researchers are constantly monitoring and summarizing the latest research,
and we continue to update our pages to ensure you have the most accurate information.
Note on the last update: One new meta analysis added
Karen Pendergrass is a researcher specializing microbial metallomics and microbiome signatures, with a focus on bridging research and clinical practice. She is the co-founder of several initiatives, including Microbiome Signatures and the Heavy Metal Tested & Certified program, which translate complex science into actionable standards.
Lead (Pb) is a pervasive environmental contaminant with no physiological function in humans.[1] Historical uses in gasoline, paint, plumbing and industrial products have left a legacy of contamination in soils and buildings. Even today, lead persists in foods, consumer products and drinking water because it is still used in manufacturing and imported goods. Global estimates show that chronic lead exposure contributed to 0.85 million cardiovascular deaths and 17.73 million disability‑adjusted life‑years (DALYs) in 2019, with ischaemic heart disease and stroke accounting for most of the burden.[2][x] Lead’s toxicity is especially pronounced in the developing nervous system, and there is no known safe blood lead level (BLL) for children.[3] Given these profound public health impacts, the Heavy Metal Tested & Certified (HMTC) program has designated lead as one of its Top 8 certification metals and applies stringent limits using the ALARA (As Low As Reasonably Achievable) principle.
Lead (Pb) is defined as a non-essential, highly toxic heavy metal that is widely distributed and persistent in the environment. [4] It is a dull silver-grey, soft metal that begins to tarnish on contact with air.[5] In environmental and biological contexts, it commonly exists in inorganic forms (Pb²⁺ salts such as lead acetate or lead oxide) and organic forms.[6] Inorganic lead dominates human exposure because it leaches from paint, plumbing, and contaminated soils into dust and water.[7] Organic lead compounds, though less common today due to regulation, are lipophilic and readily absorbed through skin or inhalation.[8] Once ingested or inhaled, lead binds to red blood cells and accumulates in soft tissues and bone.[9] In children, roughly 30 % of body lead burden resides in metabolically active tissues, making them more susceptible to toxicity.[10] Lead’s high toxicity stems from its ability to mimic and displace essential divalent cations like calcium and zinc, disrupting enzyme activity and cellular signaling.[11][12] Experts generally agree that there is no safe exposure threshold for lead in humans.
Lead exposure arises from multiple overlapping sources, making cumulative burden a key public health concern. Major sources of human exposure occur through ingestion, inhalation, and dermal contact. [13] Environmental sources such as contaminated soil, dust, and drinking water from old plumbing affect entire populations, with children at highest risk.[14] Dietary intake is the dominant exposure route for non-smokers, with lead detected in canned foods, milk, oils, and root vegetables like sweet potatoes.[15] Occupational exposure remains a critical pathway, particularly in lead-acid battery plants, smelting operations, welding, and automotive repair shops, where both acute and chronic exposure can occur.[16] These categories highlight why certification programs must evaluate finished products while considering environmental and workplace inputs.
| Source Category | Examples of Lead Exposure |
|---|---|
| Environmental | Ubiquitous in air, water, and soil; emissions from mining, fossil fuel burning, manufacturing, and smelting; contaminated soil and household dust (especially hazardous for children).[17][18] Drinking water from aging lead pipes or plumbing; deteriorating lead-based paints in homes.[19] |
| Dietary | Primary route for the general population; exposure through contaminated food and water; canned foods, milk, edible oils, and vegetables such as sweet potato.[20] |
| Occupational | High-risk industries: battery manufacturing (notably lead-acid batteries), smelting operations, automotive repair, and welding;[21] both acute and chronic exposures documented.[22] |
Evidence from toxicological and epidemiological studies shows that lead affects multiple organ systems, with developing fetuses and young children being most vulnerable.[23] Lead also interferes with heme synthesis, causing anemia, and affects endocrine and immune functions.[24] The mechanisms involving calcium channel blockade and oxidative stress underpin its broad toxicity.[25] Chronic exposure has been linked to bone demineralization, gout, and cognitive decline in adults, and there is growing evidence of interactions between lead and other metals or nutritional deficiencies.[26][27]
| Health effect | Evidence |
|---|---|
| Neurodevelopmental deficits (decreased IQ, attention problems, ADHD) | Prolonged low‑level lead exposure is associated with reduced IQ and attention problems.[28] A meta‑analysis of 14 studies links environmental lead exposure to increased ADHD risk.[29] |
| Birth defects and reproductive toxicity | Paternal lead exposure is associated with more than twice the risk of birth defects, likely due to oxidative damage and epigenetic alterations in sperm.[30] |
| Cardiovascular disease | Systematic analysis of the Global Burden of Disease study found that lead exposure caused 0.85 million cardiovascular deaths and 17.73 million DALYs in 2019, with ischaemic heart disease and stroke being major contributors.[31][x][32] |
| Bone Density Loss and Osteoporosis | Lead is stored in bones and can cause bone weakening and decreased bone mineral density, particularly in adults with chronic exposure.[33][34] Studies show that lead exposure can increase the risk of fractures and bone pain due to the mobilization of lead from bones into the bloodstream during periods of calcium deficiency or metabolic stress.[35] |
Cellular and Molecular Toxicity | Lead acts as a calcium analogue, blocking voltage‑dependent calcium channels and interfering with neurotransmission and heme synthesis.[36] It causes oxidative stress and DNA methylation changes in germ cells.[37] |
Lead exposure is not only a concern in industrial settings or old homes, but is also a significant issue in everyday consumer products. Despite regulatory efforts to limit lead in food, toys, and cosmetics, the risk of lead contamination remains in many common household and food items.[38] Baby food is also at risk of lead contamination due to the lead content in soil and water used in agriculture.[39] In addition, items such as cosmetics (like eyeliners) and certain toys have been found to contain lead, often from non-regulated imports.[40]
| Source of Exposure | Examples |
|---|---|
| Canned Foods | Lead may leach into food from older cans, especially those with lead-soldered seams. |
| Rice and Root Vegetables | Lead may be absorbed from contaminated soil, particularly affecting root crops like carrots and potatoes.[41] |
| Cosmetics and Toys | Imported cosmetics and toys, especially from regions with less stringent regulations, may contain lead-based products.[42] |
| Occupational Exposure | Industrial workers in mining, battery manufacturing, and construction may encounter high levels of lead through direct contact with lead-containing materials.[43] |
Globally, lead exposure limits are set by several organizations. The FDA, for example, has set action levels for lead in baby food, with limits of 10 ppb for fruits and vegetables, and 20 ppb for root vegetables and dry infant cereals.[44] The United States EPA has established a maximum contaminant level goal of zero for lead in drinking water, recognizing lead as a toxic metal that can harm human health even with minimal exposure and the CDC recently updated its blood lead reference value to 3.5 µg/dL to identify children at risk for lead exposure.[45][46] Despite these efforts, there are still gaps in enforcement, and vulnerable populations remain at risk from elevated lead levels in food and consumer products.
The HMTC program applies the ALARA (As Low As Reasonably Achievable) principle, ensuring that lead levels in consumer products are kept as low as possible, well below regulatory limits. This proactive approach is vital in safeguarding vulnerable groups such as children, pregnant women, and infants, who are susceptible to the harmful effects of lead exposure. By certifying products at stricter levels than required by current regulations, HMTC provides brands with a competitive edge, positioning them as leaders in product safety and consumer protection. The program offers transparency, enabling consumers to make informed choices and build trust in brands that prioritize health. HMTC certification helps brands stay ahead of tightening global regulations, ensuring that products comply with both present and future standards. Through this commitment to rigorous testing and certification, the HMTC program not only ensures public health but also promotes marketability, brand credibility, and long-term business success.
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Prenatal cadmium and nickel exposure negatively impact infant neurodevelopment, particularly expressive language. Heavy metal mixtures demonstrate cumulative risks, underscoring the need for stricter food safety thresholds and mixture-based risk assessments to protect vulnerable populations.
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Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
Alias iure reprehenderit aut accusantium. Molestiae dolore suscipit. Necessitatibus eum quaerat. Repudiandae suscipit quo necessitatibus. Voluptatibus ullam nulla temporibus nobis. Atque eaque sed totam est assumenda. Porro modi soluta consequuntur veritatis excepturi minus delectus reprehenderit est. Eveniet labore ut quas minima aliquid quibusdam. Vitae possimus fuga praesentium eveniet debitis exercitationem deleniti.
The ALARA principle (“As Low As Reasonably Achievable”) is a safety standard that minimizes harmful exposures like heavy metals beyond regulatory compliance. By applying continuous reduction practices, it ensures food and consumer products meet the lowest feasible contamination levels, protecting vulnerable populations from cumulative risks.
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Lead Exposure in Children: Failure to Protect the Most Vulnerable.The Journal of Pediatric Pharmacology and Therapeutics : JPPT, 29(3), 212.
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Potential Health Risks of Lead Exposure from Early Life through Later Life: Implications for Public Health Education.International Journal of Environmental Research and Public Health, 19(23), 16006.
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Lead exposure study among workers in lead acid battery repair units of transport service enterprises, Addis Ababa, Ethiopia: A cross-sectional study.Journal of Occupational Medicine and Toxicology (London, England), 3, 30.
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Lead toxicity: A review.Interdisciplinary Toxicology, 8(2), 55.
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The Effect of Lead on Bone Mineral Properties From Female Adult C57/BL6 Mice.Bone, 47(5), 888.
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Lead Exposure in Children: Failure to Protect the Most Vulnerable.The Journal of Pediatric Pharmacology and Therapeutics : JPPT, 29(3), 212.
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Paternal Lead Exposure and Pregnancy Outcomes: A Systematic Review and Meta-Analysis.Environmental Health Insights, 19, 11786302251327535.
Read ReviewDang, P., Tang, M., Fan, H., & Hao, J. (2024).
Chronic lead exposure and burden of cardiovascular disease during 1990–2019: A systematic analysis of the global burden of disease study.Frontiers in Cardiovascular Medicine, 11, 1367681.
Read ReviewDang, P., Tang, M., Fan, H., & Hao, J. (2024).
Chronic lead exposure and burden of cardiovascular disease during 1990–2019: A systematic analysis of the global burden of disease study.Frontiers in Cardiovascular Medicine, 11, 1367681.
Read ReviewMonir, A. U., Gundberg, C., Yagerman, S. E., Budell, W., Boskey, A. L., & Dowd, T. L. (2010).
The Effect of Lead on Bone Mineral Properties From Female Adult C57/BL6 Mice.Bone, 47(5), 888.
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Lead toxicity: A review.Interdisciplinary Toxicology, 8(2), 55.
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Paternal Lead Exposure and Pregnancy Outcomes: A Systematic Review and Meta-Analysis.Environmental Health Insights, 19, 11786302251327535.
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Heavy metals in cosmetics and tattoos: A review of historical background, health impact, and regulatory limits.Journal of Hazardous Materials Advances, 13, 100390.
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Cadmium and Lead Exposure, Nephrotoxicity, and Mortality.Toxics, 8(4), 86.
Read ReviewAbed, M. S., Moosa, A. A., & Alzuhairi, M. A. (2024).
Heavy metals in cosmetics and tattoos: A review of historical background, health impact, and regulatory limits.Journal of Hazardous Materials Advances, 13, 100390.
Read ReviewWani, A. L., Ara, A., & Usmani, J. A. (2015).
Lead toxicity: A review.Interdisciplinary Toxicology, 8(2), 55.
Read ReviewFood and Drug Administration
Guidance for Industry: Action Levels for Lead in Processed Food Intended for Babies and Young ChildrenContent current as of: 01/06/2025
Centers for Disease Control and Prevention
CDC Updates Blood Lead Reference ValueNational Center for Environmental Health, National Center for Environmental Health
United States Environmental Protection Agency
Basic Information about Lead in Drinking WaterLast updated on May 22, 2025