Tampons aren’t inherently dangerous, but they do carry real concerns worth understanding: trace amounts of toxic metals like lead and arsenic, synthetic chemicals that don’t belong near absorptive tissue, a small but serious risk of toxic shock syndrome, and a significant environmental footprint. Whether these risks add up to “bad” depends on how you weigh them, but the science behind each concern is worth a closer look.
Toxic Metals in Tampons
A UC Berkeley study tested 30 tampons from 14 brands for 16 different metals and found detectable concentrations of every single one, including arsenic, lead, cadmium, and mercury. These aren’t metals you’d expect in a product designed for one of the most absorptive tissues in the body. The vaginal lining absorbs chemicals more readily than skin because it’s thinner and has a rich blood supply, meaning contaminants can potentially enter the bloodstream without passing through the digestive system’s filtering process.
One surprising finding: lead concentrations were higher in non-organic tampons, while arsenic levels were actually higher in organic ones. This means switching to organic tampons doesn’t necessarily eliminate metal exposure. The metals likely come from the cotton itself (absorbing them from soil and water during growing) and from the manufacturing process. Researchers are still working to determine whether the concentrations found are high enough to cause harm with repeated use over decades, but the presence of lead at any level raises questions, since there is no known safe threshold for lead exposure.
PFAS and Chemical Contamination
Researchers at the University of Notre Dame found per- and polyfluoroalkyl substances, commonly called “forever chemicals,” in feminine hygiene products including tampons. These chemicals are used in manufacturing for their water-resistant and nonstick properties. They earned the nickname “forever chemicals” because they don’t break down in the environment or in your body. They accumulate over time.
PFAS exposure has been linked to increased cancer risk (particularly prostate, kidney, and testicular cancers), immune suppression, low birth weight, developmental delays in children, and hormonal disruption. The Notre Dame team found both intentionally added PFAS and secondary contamination in the products they tested. The concern is cumulative: a person who menstruates might use somewhere around 10,000 tampons over a lifetime, and even tiny amounts of these chemicals add up when the exposure is repeated month after month for decades.
Microplastics in the Reproductive Tract
Most conventional tampons contain synthetic materials like rayon, polyester, or polyethylene in their absorbent core, string, or wrapper. These materials can shed tiny plastic fragments. A preliminary study examining cervicovaginal fluid samples found 91 microplastic particles across 10 participants, with evidence suggesting a link between menstrual product use and microplastic contamination in the reproductive tract.
Once inside the body, microplastics can travel through the bloodstream to other organs. Animal studies have shown that microplastics can reach the uterus either through the blood or directly through vaginal tissue. While research on the long-term health effects of microplastics in the reproductive system is still in early stages, the vaginal route of exposure is particularly direct, bypassing many of the body’s usual defenses.
Toxic Shock Syndrome
Toxic shock syndrome is the risk most people associate with tampons, and while it’s rare today, it’s still real. TSS is a sudden, potentially life-threatening bacterial infection caused by toxins produced by Staphylococcus aureus. Symptoms come on fast: high fever, vomiting, diarrhea, a sunburn-like rash, dizziness, and confusion.
Incidence dropped dramatically after super-absorbent tampons were pulled from the market in the early 1980s, falling from 6 to 12 cases per 100,000 menstruating women in 1980 to about 1 per 100,000 by 1986, and continuing to decline after that. The risk is tied to absorbency and duration of use. Higher-absorbency tampons and leaving one in too long both increase the chance of bacterial overgrowth. Cleveland Clinic recommends changing tampons every four to eight hours and removing them after no more than eight hours. There isn’t a precise hour at which risk spikes, but the longer a tampon stays in, the more favorable the environment becomes for toxin-producing bacteria.
What the FDA Does and Doesn’t Require
Tampons are regulated as medical devices by the FDA, which sounds reassuring but comes with significant gaps. Manufacturers must demonstrate that their tampon materials don’t promote the growth of harmful bacteria or increase production of the toxin that causes TSS. They must also test absorbency using a standardized method. The FDA recommends that tampons be free of dioxins and pesticide residues, and that manufacturers describe any chemical residues present.
Here’s the catch: the FDA does not require manufacturers to list ingredients on tampon packaging. So while companies must submit safety data during the approval process, consumers have no easy way to know exactly what’s in the product they’re using. The Berkeley metals study and Notre Dame PFAS findings both highlight contaminants that fall outside the FDA’s standard testing framework. The regulatory process was designed primarily around infection risk and absorbency, not long-term chemical exposure from trace contaminants.
Environmental Impact
The environmental case against tampons is straightforward. In Europe and the United States, roughly 80 to 87 percent of menstrual products end up in landfills. The plastic components in conventional tampons, including the applicator, the string coating, and the thin plastic layer in the absorbent core, can take up to 500 years to break down. As they degrade, they release toxic chemicals into surrounding soil and water and generate microplastics that move through ecosystems.
Even “flushable” tampons aren’t truly flushable. They clog sewage systems and can end up in waterways. Over a lifetime of menstruation, a single person contributes a substantial volume of single-use plastic waste through tampon use alone, and unlike many other disposable products, there’s no recycling pathway for used menstrual products.
Alternatives and Their Tradeoffs
Menstrual cups, made from flexible hypoallergenic silicone, eliminate concerns about fibers or chemical residues being left in the vagina. They’re reusable for years, dramatically reducing waste. The Mayo Clinic considers them a safe option overall. Some cup manufacturers claim the suction seal between the cup and vaginal wall reduces bacterial exposure, though that specific claim hasn’t been scientifically confirmed. TSS cases have been reported with cups as well, though they remain extremely rare.
Period underwear is another reusable option, though some brands have faced scrutiny for containing PFAS in their moisture-wicking layers, so checking for third-party testing is worth the effort. Organic cotton pads avoid the direct vaginal contact issue entirely, though as the metals research showed, “organic” doesn’t automatically mean “chemical-free.”
No menstrual product is perfectly risk-free. But the concerns about tampons are grounded in real laboratory findings: detectable levels of toxic metals, forever chemicals in the materials, microplastic shedding into absorptive tissue, and a regulatory framework that wasn’t built to catch these problems. If you continue using tampons, choosing the lowest effective absorbency and changing them frequently reduces your exposure on every front.