Yes, tampons contain trace amounts of metals, volatile organic compounds, and other chemical contaminants. A 2024 study from UC Berkeley detected 16 different metals in tampons across 14 brands, including lead, arsenic, and cadmium. The concentrations are small, measured in nanograms per gram, but their presence has raised questions because vaginal tissue is highly absorptive and tampons sit against it for hours at a time.
Whether these trace chemicals pose a real health risk is a separate, harder question. Here’s what the testing has actually found and what it means for you.
Metals Found in Tampons
The most comprehensive metal testing to date, published in the journal Environment International in 2024, measured concentrations of 16 metals across 30 tampons from 14 brands sold in the U.S. and EU/UK. The results showed elevated levels of several toxic metals: lead averaged 120 nanograms per gram, cadmium averaged 6.74 ng/g, and arsenic averaged 2.56 ng/g. Every tampon tested contained detectable levels of multiple metals.
These metals likely come from two sources: the cotton itself, which absorbs metals from soil, water, and pesticides during growth, and the manufacturing process, which can introduce contaminants during bleaching and processing. Lead has no known safe threshold of exposure. It accumulates in bone and can remain in the body for decades. Even blood levels as low as 10 micrograms per deciliter have been linked to neurological, cardiovascular, and reproductive problems over time.
That said, the amount in a single tampon is extremely small. The key uncertainty is whether repeated exposure through vaginal tissue, which lacks the protective barrier of skin and absorbs certain compounds more readily, could add up over years of use. Researchers have flagged this as a gap in the evidence: the metals are clearly present, but no one has yet measured how much actually transfers from the tampon into the bloodstream during normal use.
Organic vs. Non-Organic Tampons
Switching to organic tampons doesn’t eliminate the problem, and in some cases shifts it. The Berkeley study found that lead concentrations were higher in non-organic tampons, while arsenic concentrations were higher in organic ones. Metal levels also varied by where the tampons were purchased (U.S. versus EU/UK) and whether they were store-brand or name-brand.
The arsenic finding in organic tampons likely traces back to the cotton-growing process. Organic farming avoids synthetic pesticides but can’t control for naturally occurring arsenic in soil and groundwater, which the cotton plant absorbs as it grows. So “organic” doesn’t mean “chemical-free.” It means a different set of chemical exposures, not necessarily a smaller one.
Volatile Organic Compounds
Beyond metals, researchers have detected volatile organic compounds (VOCs) in tampons. A pilot study measuring VOCs across U.S. tampon brands found several compounds present in small amounts: hexanal at 27.17 ng/g, 2-butanone at 1.87 ng/g, toluene at 1.34 ng/g, and methyl isobutyl ketone at 1.45 ng/g. These are chemical byproducts that can form during cotton processing, bleaching, or packaging.
Toluene is a well-known industrial solvent. At high exposures (think factory workers breathing it in), it affects the nervous system. At the trace levels found in tampons, the risk profile is far less clear. The same applies to the other VOCs detected. The concentrations are tiny, but the route of exposure, prolonged contact with mucous membrane tissue, is what makes even small amounts worth investigating.
PFAS and Pesticide Residues
PFAS, often called “forever chemicals” because they persist in the body and environment for years, have been found in some menstrual products. A 2025 study from Indiana University found PFAS at levels consistent with intentional use in nearly 30 percent of reusable menstrual products sampled. One of the most common PFAS detected in North American products was 8:2 FTOH, a compound that can transform into the more toxic PFOA once inside the body. PFAS are typically used to make products moisture-resistant or stain-resistant.
Pesticide residues, including glyphosate, have also been detected in tampons, though multiple regulatory assessments from agencies in France, Belgium, Switzerland, and Denmark have concluded the amounts are negligible. A 2018 French assessment found trace levels of pesticides, dioxins, and one phthalate in tampons but determined they posed no health risk at those concentrations. A Belgian study reached a similar conclusion, finding that tampons sold in the country were “free or only contain negligible amounts of chemicals.” Still, the French agency recommended that manufacturers work to eliminate or reduce substances with carcinogenic, endocrine-disrupting, or skin-sensitizing properties from their products.
Why Vaginal Absorption Matters
The reason trace chemicals in tampons get more scrutiny than, say, trace chemicals in a cotton T-shirt comes down to how the body absorbs them. Vaginal tissue is a mucous membrane. It has a rich blood supply and lacks the tough outer layer of skin that acts as a barrier elsewhere on the body. Medications delivered vaginally (hormones, for example) are designed to take advantage of this, entering the bloodstream without passing through the digestive system first, which means they bypass the liver’s filtering process.
This doesn’t automatically mean every contaminant in a tampon reaches your bloodstream. Absorption depends on the specific chemical, its concentration, and how easily it dissolves from the tampon fiber. Research on drug absorption through mucosal membranes shows that lipophilic (fat-soluble) compounds absorb more readily through vaginal tissue, while water-soluble compounds absorb less efficiently. Metals behave differently than organic chemicals, and whether they leach from cotton fibers in the warm, moist vaginal environment hasn’t been directly measured yet.
What the FDA Requires
Tampons are regulated as medical devices in the United States. Before a tampon can be sold, the manufacturer must test both the finished product and its raw materials for biocompatibility and safety. The FDA reviews these results before granting market authorization. Every tampon currently sold legally in the U.S. has gone through this process.
What the FDA does not require is a full ingredient list on the package. New York is currently the only state that mandates menstrual product labeling, though legislative efforts at both the state and federal level have pushed for broader disclosure. This means that in most of the country, you can’t look at a tampon box and know exactly what chemicals are present in the product, even at trace levels. Manufacturers aren’t hiding ingredients maliciously; the regulatory framework simply hasn’t caught up with the growing body of detection data.
Putting the Risk in Perspective
A 2023 safety assessment found that all substances used in tampon production met established safety margins, with no adverse effects observed in clinical trials and minimal impact on vaginal microbiota. That’s reassuring in the short term. The less settled question involves cumulative exposure. A person who menstruates might use more than 10,000 tampons over a lifetime, each one sitting against absorptive tissue for several hours. Whether decades of repeated low-level exposure to lead, cadmium, arsenic, and VOCs carries meaningful risk is something current safety testing wasn’t designed to answer.
Some research has hinted at biological effects. One study found associations between tampon use and biomarkers of oxidative stress, a type of cellular damage linked to inflammation. The researchers speculated that contaminants like pesticides in tampons could be contributing to these markers, though the study couldn’t prove a direct cause.
If you want to reduce your exposure, your options include switching between tampons and non-insertable products like pads or period underwear, choosing products from brands that publish third-party testing results, or using menstrual cups (though these have their own material considerations). No tampon, organic or conventional, is completely free of trace contaminants. The practical question is whether the levels present are high enough to matter, and for now, the evidence says probably not for any single tampon, but the lifetime picture remains an open question.