Does your body absorb heavy metals? Bioavailability explained

Written by Stephanie Eckelkamp (opens in a new tab)

Medically reviewed by Ecler Ercole Jaqua, MD, MBA, DABOM (opens in a new tab)

If you believe TikTok, everything in your pantry is trying to poison you. One week it’s <a href="https://cen.acs.org/safety/consumer-safety/Worried-toxic-metals-Girl-Scout/103/web/2025/04" rel="noopener noreferrer" target="_blank">Girl Scout cookies</a> or <a href="https://news.immunologic.org/p/consumer-reports-latest-panic-toxic" rel="noopener noreferrer" target="_blank">protein powders</a> laced with lead. The next, it’s farm-fresh veggies riddled with arsenic. The implication: If it’s in your food, it’s in your body, and that’s bad news. But it’s not that simple, or that scary. Many foods contain trace heavy metals because these elements occur naturally in soil and water and make their way through the food chain into produce and meat. But your gastrointestinal tract isn’t a pipeline straight to your bloodstream. It’s a selective filter that blocks, binds, and eliminates heavy metals so they don’t harm your health. Only a fraction of the heavy metals you eat are absorbed; most pass right through your system. This concept — that not everything you eat is absorbed — is called bioavailability, and understanding it will help you separate real toxicology from fearmongering.<h2>Does Your Body Absorb All the Heavy Metals You Eat? </h2>No, your body only absorbs a small fraction of the heavy metals you consume. This fraction — known as a food’s bioavailability — depends on a long list of factors including what else you eat, your nutrient status, gut health, age, and more.Keep in mind, many essential minerals you actually need for life, like iron, zinc, and copper are heavy metals <a href="https://www.ncbi.nlm.nih.gov/books/NBK557806/#:~:text=Introduction,concentrations%20are%20reached.%5B2%5D" rel="noopener noreferrer" target="_blank">in the chemical sense</a>.The ones worth worrying about are the non-essential metals, like lead, cadmium, mercury, and arsenic. These serve no useful purpose in the body, and at high enough levels, they can cause harm. But here’s the part that usually gets lost in translation: dose and absorption matter. Most vitamins, minerals, and metals can be toxic at certain levels; it’s the exposure and bioavailability that make the difference.Trace amounts of non-essential heavy metals show up naturally in food, but your body only absorbs a small fraction of them. Here’s what the research suggests about how much is absorbed in adults:<ul><li>Lead: <a href="https://www.atsdr.cdc.gov/toxprofiles/tp13.pdf" rel="noopener noreferrer" target="_blank">3-10%</a> </li><li>Cadmium: <a href="https://www.nal.usda.gov/research-tools/food-safety-research-projects/reducing-cadmium-bioavailability-food-protecting-human-gut-microbiota-cadmium-toxicity#:~:text=Most%20healthy%20individuals%20only%20absorb%203%2D8%25%20of%20dietary%20Cd%2C%20leaving%20a%20majority%20of%20Cd%20to%20interact%20with%20the%20gut%20microbiota." rel="noopener noreferrer" target="_blank">3-8%</a></li><li>Mercury: <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC5334723/#:~:text=overall%20mean%20absorption%20estimates%20ranged%20from%2012%25%20to%2079%25%20for%20MeHg%20and%2049%25%20to%2069%25%20for%20total%20Hg%20(Figure%203%20and%20Figure%204%3B%20Tables%20S3%20and%20S5)." rel="noopener noreferrer" target="_blank">12-79%</a></li><li>Arsenic: <a href="https://www.ncbi.nlm.nih.gov/books/NBK222322/#:~:text=Physiology%20of%20Absorption%2C%20Metabolism%2C%20and,arsenic%20(Yamato%2C%201988)." rel="noopener noreferrer" target="_blank">60-70%</a> </li></ul>Some of those percentages might look alarming, but keep this in mind: These are percentages of <a href="http://science.drinklmnt.com/did-you-know/toxins-vs-toxicology-why-dose-matters" rel="noopener noreferrer" target="_blank">an already small amount</a>. Research shows that the heavy metal content in a serving of many <a href="https://www.sciencedirect.com/science/article/abs/pii/S0269749118322401" rel="noopener noreferrer" target="_blank">whole</a> and <a href="https://www.fda.gov/media/159745/download" rel="noopener noreferrer" target="_blank">packaged foods</a> falls well under federal and international safety limits.To put it in perspective, let’s look at the amount of lead in a serving of four common foods, along with how much your body actually absorbs, based on a 3-10% absorption rate. As you review this table, keep in mind that the <a href="https://www.fda.gov/food/environmental-contaminants-food/lead-food-and-foodwares" rel="noopener noreferrer" target="_blank">FDA</a> recommends total daily lead intake from food stays under 8.8 mcg for women of childbearing age.

Food (1 serving)	Lead present (mcg)	Estimated amount absorbed
LMNT Raw Unflavored (1 stick pack)	0.1 mcg	0.0003–0.001 mcg
Peanut Butter Girl Scout Cookies (2)	1.06 mcg	0.032–0.106 mcg
Potato (1 medium, conventionally grown)	3 mcg	0.09–0.3 mcg
Carrots (½ c, organic)	0.92 mcg	0.028–0.092 mcg

Even at the high end, these absorbed quantities are so microscopic they’re not even visible to the human eye. A single grain of salt weighs about <a href="https://toxedfoundation.org/avogadros-number/" rel="noopener noreferrer" target="_blank">60 mcg</a> — that’s about 566 times heavier than the amount of lead absorbed from any of the foods above.What’s more, a portion of the small amount your body absorbs is processed and excreted through stool and urine. For example, <a href="https://www.epa.gov/sites/default/files/2014-03/documents/a_review_of_arsenic_poisoning_and_its_effects_on_human_health_3v.pdf" rel="noopener noreferrer" target="_blank">most of the arsenic</a> your body absorbs is <a href="https://science.drinklmnt.com/did-you-know/detoxification-mechanisms-how-body-clears-heavy-metals" rel="noopener noreferrer" target="_blank">converted into a less harmful form by the liver</a> and 70-80% is cleared out within a week. <h2>How Food Protects You From Heavy Metal Absorption </h2>Your body doesn't passively soak up whatever you eat. Many whole foods contain nutrients and compounds that bind, block, or escort heavy metals out of your system.<h3>Selenium: counteracts mercury</h3>Selenium is a mineral that <a href="https://edis.ifas.ufl.edu/publication/FS437#:~:text=How%20does%20Se,rich%20in%20Se." rel="noopener noreferrer" target="_blank">binds strongly to</a> mercury. When these two nutrients are ingested together, less toxic <a href="https://www.sciencedirect.com/science/article/pii/S2666765723001084#:~:text=Se%20acts%20as%20a%20critical%20element%20in%20mitigating%20the%20toxicity%20of%20Hg%20and%20MeHg%20because%20if%20present%20in%20adequate%20concentrations%2C%20it%20can%20bind%20to%20MeHg%2C%20forming%20less%20toxic%20compounds%2C%20reducing%20the%20absorption%20of%20MeHg%20by%20the%20gastrointestinal%20tract%20and%20accelerating%20its%20excretion" rel="noopener noreferrer" target="_blank">mercury-selenium complexes</a> <a href="https://pubmed.ncbi.nlm.nih.gov/29124976/#:~:text=The%20roles%20selenium,intracellular%20redox%20environment." rel="noopener noreferrer" target="_blank">are formed</a>, which are harder to absorb and easier to eliminate.Selenium also helps <a href="https://www.sciencedirect.com/science/article/pii/S0269749117323801?via%3Dihub#:~:text=Our%20results%20demonstrated,low%20Se%20treatment." rel="noopener noreferrer" target="_blank">convert</a> methylmercury (the more absorbable form) into inorganic mercury, which is largely excreted, in a process called demethylation. And it <a href="https://www.sciencedirect.com/science/article/pii/S0147651319310516?via%3Dihub#sec4:~:text=The%20results%20in,deserves%20further%20study." rel="noopener noreferrer" target="_blank">supports a healthy gut barrier</a>, which prevents metals from “leaking” into circulation. While fish is often flagged for containing high levels of mercury, headlines don’t mention that <a href="https://pubmed.ncbi.nlm.nih.gov/30755081/" rel="noopener noreferrer" target="_blank">many species</a> also <a href="https://edis.ifas.ufl.edu/publication/FS437" rel="noopener noreferrer" target="_blank">contain selenium</a>. When selenium levels exceed mercury levels (the case in <a href="https://www.sciencedirect.com/science/article/pii/S0308814623021623" rel="noopener noreferrer" target="_blank">nearly all commonly eaten fish</a>), the two form stable, inactive complexes the body can clear more easily. Bottom line: For most people, eating <a href="https://www.fda.gov/media/102331/download?attachment" rel="noopener noreferrer" target="_blank">two to three 4-ounce servings</a> of salmon, sardines, or trout each week keeps mercury exposure within safe limits while providing omega-3 fats, protein, and other essential vitamins and minerals.<h3>Calcium, iron, and zinc: blocks heavy metal absorption</h3>Heavy metals and essential minerals compete for the same nutrient transport proteins in your gut. When you eat nutrient-dense meals, more minerals occupy these transporters, leaving fewer available for heavy metals, effectively blocking their absorption. <ul><li>Zinc <a href="https://www.sciencedirect.com/science/article/pii/S0022316622089519?via%3Dihub#:~:text=Zinc%20transporters%20such%20as%20ZIP8%20and%20ZIP14%20are%20partly%20responsible%20for%20the%20absorption%20and%20accumulation%20of%20cadmium%20(33%2C%2034%2C%2035)%2C%20and%20the%20uptake%20of%20cadmium%20by%20ZIP8%20is%20inhibited%20mostly%20by%20zinc%20compared%20with%20other%20transition%20metals" rel="noopener noreferrer" target="_blank">decreases cadmium</a> absorption</li><li>Iron decreases both <a href="https://www.sciencedirect.com/science/article/pii/S0048969704001950?via%3Dihub" rel="noopener noreferrer" target="_blank">lead</a> and <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4303853/#sec2:~:text=Iron%20competes%20with,system%20%5B47%5D" rel="noopener noreferrer" target="_blank">cadmium</a> absorption </li><li>Calcium <a href="https://www.jpeds.com/article/s0022-3476(17)30179-8/fulltext#:~:text=The%20link%20between,in%20lead%20absorption." rel="noopener noreferrer" target="_blank">decreases lead</a> absorption and also <a href="https://www.sciencedirect.com/science/article/pii/S0048969725010472?via%3Dihub" rel="noopener noreferrer" target="_blank">binds to arsenic in the gut</a>, forming <a href="https://www.nature.com/articles/s41598-026-44078-3_reference.pdf" rel="noopener noreferrer" target="_blank">compounds</a> your body can’t absorb as well.</li></ul><h3>Fiber and phytochemicals: binds and blocks heavy metals</h3>Compounds in plant foods, including <a href="https://iadns.onlinelibrary.wiley.com/doi/10.1002/fft2.114#" rel="noopener noreferrer" target="_blank">dietary fiber</a>, polyphenols and other phytochemical compounds reduce absorption of heavy metals. This may be because they bind to heavy metals in the gut, forming complexes that are too large to cross the intestinal wall and unable to use metal transporters. The result: Heavy metals like <a href="https://www.sciencedirect.com/science/article/pii/S0308814608005906?via%3Dihub#aep-section-id19" rel="noopener noreferrer" target="_blank">mercury, </a><a href="https://pubs.acs.org/doi/10.1021/acs.jafc.0c01582" rel="noopener noreferrer" target="_blank">cadmium</a>, <a href="https://link.springer.com/article/10.1007/s12011-020-02498-w" rel="noopener noreferrer" target="_blank">lead</a>, and <a href="https://www.sciencedirect.com/science/article/abs/pii/S0141813023036127#:~:text=Recent%20investigations%20have%20focused%20on%20the%20possible%20contribution%20of%20polyphenols%20in%20reducing%20arsenic%20toxicity.%20Studies%20have%20demonstrated%20polyphenols%20to%20bind%20to%20arsenic%2C%20reducing%20its%20absorption%20in%20the%20body%20and%20protecting%20against%20oxidative%20damage%20induced%20by%20arsenic%20exposure%20%5B13%5D" rel="noopener noreferrer" target="_blank">arsenic</a> are excreted instead of absorbed. Phytochemical compounds with heavy metal-clearing properties include:<ul><li><a href="https://www.sciencedirect.com/science/article/pii/S0308814608005906?via%3Dihub#aep-section-id19" rel="noopener noreferrer" target="_blank">Catechins</a> in green tea</li><li><a href="https://link.springer.com/article/10.1007/s12011-020-02498-w" rel="noopener noreferrer" target="_blank">Quercetin</a> in apples and onions</li><li><a href="https://pubs.acs.org/doi/pdf/10.1021/acs.jafc.0c01582?ref=article_openPDF" rel="noopener noreferrer" target="_blank">Proanthocyanidins</a> in berries</li><li><a href="https://pubs.acs.org/doi/10.1021/acs.jafc.0c01582" rel="noopener noreferrer" target="_blank">Carotenoids</a> in carrots and spinach</li><li><a href="https://link.springer.com/article/10.1007/s12011-020-02498-w#:~:text=Curcumin%20mainly%20protects%20the%20body%20from%20lead%20poisoning%20by%20inhibiting%20lead%2Dinduced%20oxidative%20stress%20and%20chelating%20lead%20to%20form%20complexes." rel="noopener noreferrer" target="_blank">Curcumin</a> in turmeric</li></ul><a href="https://www.sciencedirect.com/science/article/pii/S0963996923014060?via%3Dihub" rel="noopener noreferrer" target="_blank">Fiber</a> and <a href="https://www.sciencedirect.com/science/article/pii/S2590097825000060" rel="noopener noreferrer" target="_blank">phytochemicals</a> also support a diverse, resilient gut microbiome and strengthen the intestinal barrier, both of which <a href="https://pubs.acs.org/doi/10.1021/acs.est.5c00817" rel="noopener noreferrer" target="_blank">may further reduce heavy metal absorption</a>. <h3>Probiotics: supports a healthy gut barrier </h3><a href="https://link.springer.com/article/10.1007/s12011-023-03693-1#:~:text=Four%20clinical%20studies,%2C%2048%5D." rel="noopener noreferrer" target="_blank">Research</a> suggests consuming certain probiotics strains (via yogurt or supplements) may reduce blood levels of heavy metals in people with known exposure. The likely reason: <a href="https://link.springer.com/article/10.1007/s12011-023-03693-1#:~:text=(b)%20reduced%20heavy%20metal%20absorption%20by%20enterocytes%20(intestinal%20sequestration)%20through%20a%20metal%20chelation%20process%20in%20the%20gut%20and%20thus%20increased%20contents%20of%20metal%20in%20feces%20in%20the%20rectum%20%5B45%2C%2048%5D." rel="noopener noreferrer" target="_blank">reduced absorption</a> in the gut. Here’s what might be causing that: <ul><li>Probiotic bacteria, including Lactobacillus strains, may <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC11915010/#:~:text=Probiotic%20strains%20of%20Lactobacillus%20have,metals%20in%20human%20clinical%20trials." rel="noopener noreferrer" target="_blank">improve gut barrier integrity. I</a>n one animal study, <a href="https://journals.asm.org/doi/10.1128/aem.03417-12" rel="noopener noreferrer" target="_blank">Lactobacillus plantarum helped block cadmium absorption</a> by reversing damage to tight junction proteins — structures in the gut’s lining that prevent compounds from “leaking” into circulation.</li><li>Probiotic bacteria may also help <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC11915010/#:~:text=Probiotic%20strains%20of%20Lactobacillus%20have,metals%20in%20human%20clinical%20trials." rel="noopener noreferrer" target="_blank">trap and eliminate</a> heavy metals or convert them to <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC11915010/#:~:text=Probiotic%20strains%20of%20Lactobacillus%20have,metals%20in%20human%20clinical%20trials." rel="noopener noreferrer" target="_blank">less bioavailable forms</a> the body can’t absorb as well, according to lab studies. </li></ul>The bottom line here: Foods often flagged for containing heavy metals also contain nutrients that prevent their absorption. Testing reports measure total content but don’t reflect these protective interactions, missing the complete biological picture.<h2>Why Do Some People Absorb More Heavy Metals Than Others? </h2>Two people can eat the same meal and absorb very different amounts of heavy metals. That variability comes down to individual factors like nutrient status, life stage, and gut health.<h3>Nutrient deficiencies</h3>Low mineral status opens the door to higher metal absorption. <a href="https://www.atsdr.cdc.gov/toxprofiles/tp13.pdf" rel="noopener noreferrer" target="_blank">Iron, zinc, and calcium</a> deficiencies are linked to higher absorption of heavy metals like <a href="https://www.atsdr.cdc.gov/toxprofiles/tp13.pdf" rel="noopener noreferrer" target="_blank">lead</a> and <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4303853/#sec2:~:text=Iron%20competes%20with,system%20%5B47%5D" rel="noopener noreferrer" target="_blank">cadmium</a>. <a href="https://pubmed.ncbi.nlm.nih.gov/4068053/" rel="noopener noreferrer" target="_blank">Research</a> has found that mice on a calcium-deficient diet eliminated 40% less lead than mice who got enough calcium. may increase lead absorption. Here’s why: When you’re low on these nutrients, it makes it easier for heavy metals to attach to the nutrient transporters in the gut and enter your circulation. Mineral deficiencies often trigger the body to create <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4303853/#sec2:~:text=Iron%20competes%20with,system%20%5B47%5D" rel="noopener noreferrer" target="_blank">more of these transporters</a>, giving heavy metals more “doors” to slip through and less competition to get through them. <h3>Life stage </h3>Children can absorb <a href="https://www.atsdr.cdc.gov/toxprofiles/tp13.pdf" rel="noopener noreferrer" target="_blank">40-50%</a> of the lead they ingest. That’s about 4–5 times as much as adults, and they're more likely to be on the high end if they have <a href="https://www.who.int/news-room/fact-sheets/detail/lead-poisoning-and-health#:~:text=Young%20children%20are%20particularly%20vulnerable%20to%20lead,nutrients%20are%20deficient%2C%20especially%20calcium%20or%20iron." rel="noopener noreferrer" target="_blank">iron and calcium</a> deficiencies. Although research is lacking, pregnant women may also <a href="https://www.atsdr.cdc.gov/toxprofiles/tp13.pdf" rel="noopener noreferrer" target="_blank">absorb more heavy metals</a>. That’s because as nutrient demands rise, many pregnant women experience <a href="https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2822546" rel="noopener noreferrer" target="_blank">nutrient deficiencies</a> that can <a href="https://www.acog.org/clinical/clinical-guidance/committee-opinion/articles/2012/08/lead-screening-during-pregnancy-and-lactation" rel="noopener noreferrer" target="_blank">increase heavy metal absorption</a>. <a href="https://pubmed.ncbi.nlm.nih.gov/12460733/" rel="noopener noreferrer" target="_blank">Research</a> in rats suggests that pregnancy may also increase the numbers of nutrient transporters, which can let more heavy metals into the body. <h3>Gut microbiome and barrier function</h3>Your intestinal lining is meant to be selectively permeable, allowing for the regulated uptake of vitamins, minerals, and other nutrients into circulation, while keeping harmful compounds out — or at least reducing their absorption. <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC11438725/#:~:text=Factors%20that%20can%20damage%20the%20intestinal%20barrier" rel="noopener noreferrer" target="_blank">Alcohol</a>, <a href="https://www.sciencedirect.com/science/article/pii/S2590097822000209#:~:text=Dietary%20fiber%20deprivation%20in%20mice%20led%20to%20mucus%20layer%20depletion%2C%20disruption%20of%20intestinal%20barrier%20due%20to%20the%20alteration%20of%20mucus%2Deroding%20microbes%20(such%20as%20B.%C2%A0caccae%20and%20A.%C2%A0muciniphila)%20%5B67%5D%2C%20which%20might%20increasing%20intestinal%20permeability%20induced%20by%20DSS%20%5B68%5D." rel="noopener noreferrer" target="_blank">low fiber intake</a> and <a href="https://pubmed.ncbi.nlm.nih.gov/34902573/#:~:text=Both%20hyperglycemia%20and%20excessive%20sugar%20intake%20disrupt%20the%20intestinal%20barrier%2C%20thus%20increasing%20gut%20permeability%20and%20causing%20profound%20gut%20microbiota%20dysbiosis" rel="noopener noreferrer" target="_blank">high sugar consumption</a> disrupt the balance of microbes, leading to changes that make the gut barrier “leaky,” or less discerning about what (or how much) gets through. When that happens, <a href="https://pubs.acs.org/doi/10.1021/acs.est.5c00817" rel="noopener noreferrer" target="_blank">heavy metals may have an easier route into circulation</a>. Gut microbiome disruption can also blunt <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC11317476/#:~:text=In%20contrast%2C%20the,processes%20(41)." rel="noopener noreferrer" target="_blank">demethylation</a> of a highly toxic form of mercury, a reaction that makes mercury less bioavailable and less toxic.<h2>What Bioavailability Means for Your Daily Food Choices </h2>Most foods contain trace heavy metals, but your body is generally well-equipped to handle those miniscule exposures, especially when you’re properly nourished. So it’s best not to fixate on whether a specific food contains metals.Instead ask: “Am I eating in a way that minimizes their bioavailability?” Here’s what that looks like in practice:<ul><li>Focus on overall diet quality, not trace-level contamination. Build meals around whole and minimally processed vegetables, fruits, nuts, seeds, legumes, healthy fats like olive oil, and high-quality dairy, fish, and meats. These foods supply the minerals that block metal absorption and the fiber that helps remove what gets through.</li><li>Meet your mineral needs. Regularly eat foods rich in <a href="https://ods.od.nih.gov/factsheets/Calcium-HealthProfessional/#h4" rel="noopener noreferrer" target="_blank">calcium</a> (e.g. dairy, sardines and salmon with bones, dark greens), <a href="https://ods.od.nih.gov/factsheets/Iron-HealthProfessional/#h4" rel="noopener noreferrer" target="_blank">iron</a> (e.g. beef, beans, lentils, spinach), <a href="https://ods.od.nih.gov/factsheets/Zinc-HealthProfessional/#h3" rel="noopener noreferrer" target="_blank">zinc</a> (e.g. fish, meat, fish, pumpkin seeds), and <a href="https://ods.od.nih.gov/factsheets/Selenium-HealthProfessional/#h4" rel="noopener noreferrer" target="_blank">selenium</a> (e.g. Brazil nuts, sardines, cottage cheese, eggs). Getting enough of these minerals ensures that transport proteins in the gut move nutrients into circulation instead of heavy metals.</li><li>Maintain a healthy gut. A healthy microbiome supports detoxification and gut barrier integrity. Prioritize fiber, probiotic-rich fermented foods, and colorful plant foods containing phytochemicals. Limit alcohol and sugar and take steps to curb stress. </li></ul>Trace heavy metals are everywhere, but your body has systems in place to deal with them. So don’t major in the minors. Stay nourished, keep your gut healthy, and you’ll have already solved most of the problem. This was the fifth article in our six-part "Toxicology in Context: Heavy Metals" series. Want to read the other articles? Check them out below: <ul><li><a href="https://science.drinklmnt.com/did-you-know/brief-history-of-heavy-metals" rel="noopener noreferrer" target="_blank">A brief history of heavy metals in public health</a></li><li><a href="https://science.drinklmnt.com/did-you-know/toxins-vs-toxicology-why-dose-matters" rel="noopener noreferrer" target="_blank">Toxins vs. toxicology: Why dose matters</a></li><li><a href="https://science.drinklmnt.com/did-you-know/heavy-metal-regulations-proposition-65-explained" rel="noopener noreferrer" target="_blank">Understanding heavy metal regulations like Prop 65</a></li><li><a href="https://science.drinklmnt.com/did-you-know/how-to-read-toxicology-report-convert-parts-per-billion" rel="noopener noreferrer" target="_blank">How to read a toxicology report: What does parts per billion mean?</a></li><li><a href="https://science.drinklmnt.com/did-you-know/detoxification-mechanisms-how-body-clears-heavy-metals" rel="noopener noreferrer" target="_blank">Mechanisms of detoxification: How the body clears heavy metals</a></li></ul> <h2>FAQ </h2>Q: Does your body absorb all the heavy metals you eat?A: No. Bioavailability varies widely depending on the metal, your nutrient status, gut health, and the overall food matrix (the physical and chemical structure of a food). A significant portion of heavy metals pass through the digestive tract unabsorbed, while another portion are processed by organs like the liver and eliminated. Q: How does selenium protect against mercury?A: Selenium (especially when present in <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC8026698/#:~:text=The%20question%20of,limited%20and%20ambiguous%E2%80%9D." rel="noopener noreferrer" target="_blank">greater quantities</a>) binds tightly to mercury, forming stable, less-toxic complexes that reduce its reactivity and absorption. Selenium also supports demethylation, a process that converts methylmercury into less bioavailable inorganic mercury. Most fish <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC4321736/?utm_source=chatgpt.com#:~:text=Few%20samples%20had%20selenium%3Amercury%20molar%20ratios%20below%201" rel="noopener noreferrer" target="_blank">contain more selenium than mercury</a>, providing natural protection.Q: Why do some people absorb more heavy metals than others?A: Absorption depends on factors like nutrient status, gut integrity, and life stage. Deficiencies in minerals such as calcium, iron, and zinc increase metal uptake because these elements share nutrient transport pathways. In fact, pregnant women may absorb more lead as they’re at greater risk for iron deficiency, while growing children <a href="https://www.nejm.org/doi/pdf/10.1056/NEJMra2402527" rel="noopener noreferrer" target="_blank">may absorb more</a> due to greater nutrient demands.Q: Are heavy metals in vegetables dangerous if they're not absorbed?A: No. Vegetables can contain trace metals from soil or water, but most of what’s present isn’t absorbed. Plus, many plant compounds actually reduce absorption. Fiber, polyphenols, and minerals in vegetables bind metals in the gut and support elimination. The nutrients that make vegetables healthy are the same ones that help keep heavy metals in check.