This article walks through what that research actually found, and where these metals tend to show up in daily, non-occupational life. It is meant to help you understand the science and ask better questions, not to tell you what caused anything in your own body. Metal levels are just one factor among many that researchers are studying, and none of this is a diagnosis.
Fertility is shaped by many things: age, genetics, hormones, and overall health. Over the past few years, though, researchers have also been looking at a less obvious piece of the puzzle, trace metals that people pick up through ordinary, everyday contact with water, food, and household items (not through a job or industrial exposure). Two metals in particular, lead and arsenic, keep showing up in recent studies of sperm quality and ovarian egg reserve.
This article walks through what that research actually found, and where these metals tend to show up in daily, non-occupational life. It is meant to help you understand the science and ask better questions, not to tell you what caused anything in your own body. Metal levels are just one factor among many that researchers are studying, and none of this is a diagnosis.
Lead and sperm quality: what the research found
Lead is one of the most studied metals in male reproductive research. A 2023 systematic review and meta-analysis pooled data from ten studies comparing semen quality in men with higher versus lower lead exposure. It found that men with greater lead exposure had, on average, lower semen volume, lower total sperm count, lower sperm concentration, and reduced sperm motility, and the size of the effect tended to track with the level of exposure (a dose-response pattern). The authors noted that lead can build up in the body over time and enter it through ordinary air, water, or food contamination, not just workplace exposure.
Want a deeper look at lead specifically? Read our full guide to lead exposure →
Arsenic and ovarian egg reserve: what the newest research found
On the female fertility side, a 2026 hospital-based study compared follicular fluid (the fluid surrounding a developing egg) in women with diminished ovarian reserve to women with normal ovarian reserve. Arsenic stood out: women with lower ovarian reserve had meaningfully higher arsenic levels in that fluid, and arsenic was one of the strongest individual predictors in the statistical models. Strontium and calcium were also elevated in the lower-reserve group, while copper, zinc, and vanadium tended to be lower. The researchers described arsenic as one of the more consistent, independent signals across several different types of analysis, while cautioning that this was a single case-control study and cannot show cause and effect.
It's worth noting that "arsenic" is not one single thing. The organic arsenic found in fish and shellfish is considered low-toxicity and is handled differently by the body than inorganic arsenic from sources like water or rice. Most of the everyday exposure of health concern relates to the inorganic form.
Want a deeper look at arsenic specifically? Read our full guide to arsenic exposure →
Keeping this research in context
These are population-level associations from observational studies, not a measurement of any individual's body or fertility. They don't establish that lead or arsenic exposure causes infertility, and the researchers themselves describe them as early signals, not settled conclusions, given real limits: no established cause and effect, modest sample sizes, and confounding factors like age, diet, and geography that are hard to fully separate out.
Exposure patterns also vary widely by person and place, so none of this says anything about any particular household or individual.
Traced is an environmental exposure test. It does not measure fertility, hormone levels, sperm quality, ovarian reserve, or any other reproductive health marker, and results should not be used to make decisions about fertility or family planning. Speak with a qualified clinician about your individual fertility questions.
Where lead shows up in everyday, non-occupational life
According to the Agency for Toxic Substances and Disease Registry (ATSDR), the general public is most often exposed to lead this way:
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Older plumbing and fixtures. Homes with lead pipes or lead solder in the plumbing can have lead leach into tap water, especially when water sits in the pipes overnight or is naturally acidic ("soft") (ATSDR).
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Pre-1978 paint and the dust or soil around older homes. The EPA notes that homes and childcare facilities built before 1978, when residential lead paint was banned, may contain lead-based paint; as it deteriorates or is disturbed during renovation, it generates lead dust that can settle into household dust and surrounding soil. EPA's Renovation, Repair and Painting Rule covers paid work that disturbs painted surfaces in these older buildings.
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Certain hobbies. Stained-glass work, casting ammunition or fishing weights, and soldering are called out specifically by ATSDR as everyday (non-job) sources of lead contact.
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Imported cosmetics, folk remedies, and certain imported foods or spices. CDC and ATSDR identify specific traditional products, including kohl, kajal, and surma (eye cosmetics) and sindoor (a cosmetic and ceremonial powder), that have tested at very high lead concentrations, in some cases well above 40% lead by weight, along with certain imported spices, candies, and traditional medicines such as azarcon and greta.
Where arsenic shows up in everyday, non-occupational life
ATSDR and CDC materials point to a fairly consistent picture for the general population:
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Diet is typically the single largest source. For most adults, food, not water, accounts for the majority of everyday arsenic intake, with meat, fish, and poultry together contributing a large share.
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Private well water. Groundwater in some regions of the U.S. (the Southwest, Northwest, Northeast, and areas near geothermal activity) naturally contains higher arsenic levels. This mainly affects private wells: the EPA notes that, unlike public water systems, private wells (used by an estimated 43 million people, about 15% of the U.S. population) are not regulated under the Safe Drinking Water Act, so testing and treatment are left to the well owner.
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Rice and rice-based foods. Rice tends to take up naturally occurring arsenic from soil and irrigation water more readily than many other grains.
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Soil near older pressure-treated wood. Wood treated with chromated copper arsenate (CCA) before 2003 can leach arsenic into surrounding soil, which matters most for young children who play in that soil.
How Traced helps you see lead and arsenic patterns
Most standard metal testing, a single blood or urine draw, gives you a snapshot: one reading, from one moment, with no sense of what came before or after it. Traced works differently. Because hair grows steadily and takes up trace elements as it forms, a single sample can be mapped across a rolling 30-day window, showing lead, arsenic, and other elements as a timeline rather than a single number.
That kind of timeline can provide useful context as you learn more about your own everyday exposure patterns.
Traced is an environmental exposure test. It does not measure fertility, hormone levels, sperm quality, ovarian reserve, or any other reproductive health marker, and results should not be used to make decisions about fertility or family planning. Speak with a qualified clinician about your individual fertility questions.
This article summarizes published research for general educational purposes. It does not diagnose any condition, and it is not medical, treatment, or medication guidance. Talk with a qualified clinician about your individual health and fertility questions.
