Which Sanitary Pads Are Safe to Use?

Most commercially available sanitary pads are considered safe for routine use, but “safe” comes with caveats that matter. Researchers have detected volatile organic compounds, phthalates, heavy metals, and per- and polyfluoroalkyl substances (PFAS) in pads across multiple countries and brands. The amounts are typically small, and risk assessments so far suggest exposure from any single pad falls well below established safety thresholds. Still, the vulvar skin these products sit against is more permeable than skin elsewhere on the body, and the cumulative effect of years of daily contact during menstruation is not fully understood. Choosing a safer pad means understanding what is in them and what the science actually says about those ingredients.

What Chemicals Have Researchers Found in Pads

The list of detected chemicals is longer than most people expect. A 2019 laboratory analysis of commercial sanitary pads found that every single brand tested contained the phthalates DBP and DEHP, with DBP concentrations ranging widely from about 52 to over 7,800 parts per billion depending on the brand. Phthalate levels in pads were significantly higher than those found in common commercial plastic products like food containers and shopping bags.¹ Volatile organic compounds like toluene and xylene were also detected, with concentration differences of up to 5,900-fold between brands, meaning the brand you choose can dramatically affect your chemical exposure.¹

A 2025 study confirmed this pattern, finding toluene in 97% of all pads tested (28 out of 29 brands), though at levels that varied from less than 0.04 to 2.79 micrograms per pad. That study also quantified microplastics shed from the pads and ran cell toxicity assays on pad extracts.² Beyond VOCs, researchers have measured PFAS in sanitary pads at a sum concentration of about 52.3 nanograms per gram, second only to paper diapers among personal hygiene products.³ PFAS are the so-called “forever chemicals” that persist in the environment and in human tissue, and their presence in menstrual products has drawn increasing scrutiny.

Heavy metals round out the picture. An analysis of sanitary napkins from seven countries found moderate levels of lead, cadmium, zinc, and chromium, with lower levels of arsenic, cobalt, copper, and nickel.⁴ These metals likely come from raw materials, dyes, adhesives, or manufacturing processes rather than being intentionally added.

Does the Amount Actually Matter

Detecting a chemical in a product and proving it causes harm are two very different things. Most risk assessments of sanitary pads have concluded that the exposure from individual chemicals falls below thresholds set by health agencies. A Japanese study, for example, measured dioxins in seven sanitary napkin brands and calculated that the estimated daily exposure was roughly 1,600 to 29,000 times lower than the lowest tolerable daily intake set by international agencies.⁵ A study of polychlorinated biphenyls (PCBs) in Nigerian pads similarly found that hazard quotient values were below one, meaning the calculated risk stayed within acceptable limits, and lifetime cancer risk estimates ranged from very low to low.⁶

These findings can sound reassuring, and in a narrow sense they are. But there is a catch that the single-chemical risk assessments tend to miss. They evaluate one substance at a time against its own safety threshold. A real sanitary pad contains traces of phthalates, VOCs, PFAS, heavy metals, and potentially dioxins all at once. Nobody has a good handle on what simultaneous low-level exposure to all of these does over the 30 to 40 years a person might use menstrual products. A review of the epidemiologic literature found that nearly two dozen studies have measured environmental contaminants in menstrual products, and all of them detected chemicals, but they reached conflicting conclusions about how much risk that exposure actually poses. Only three human studies have investigated whether menstrual product use correlates with chemical concentrations in the body, and all three found associations.⁷

So the honest answer is that individually, the chemicals in most pads probably fall within safe exposure ranges, but the cocktail effect over decades is an open question. Researchers have flagged this as a gap worth closing, and it is one reason some people prefer to reduce their exposure where they can.

Why Vulvar Skin Is a Special Concern

One reason menstrual product chemicals get extra attention is anatomy. The vulvar and vaginal epithelium is thinner and more permeable than the skin on, say, your forearm. Chemicals that would barely penetrate intact skin elsewhere on the body have a better shot at reaching systemic circulation through this tissue. That is not a theoretical worry: it is the principle behind transdermal drug delivery in that area, and it applies equally to unwanted chemicals. As pads sit against this tissue for hours at a stretch, often in a warm, moist environment that can further increase absorption, even trace amounts of contaminants have a plausible pathway into the bloodstream.⁷

The phthalate data drives this point home. Phthalates are endocrine-disrupting chemicals linked to reproductive and developmental effects at higher exposures. The fact that pads contained significantly more phthalates than common plastic products people handle daily raises an eyebrow specifically because of where pads are worn.¹ A plastic bag in your hand is one thing. A product pressed against highly absorbent mucous-adjacent skin for six to eight hours is another.

Skin Reactions and Allergens to Watch For

Chemical safety is not just about systemic exposure. Some pad ingredients can cause local skin problems. Contact dermatitis from sanitary pads is well documented in dermatology literature, and the allergens that tend to cause it include acrylates and methacrylates (used in adhesives), the preservative iodopropynyl butylcarbamate, fragrances, and formaldehyde.⁸ If you have persistent itching, redness, or rash in the vulvar area that coincides with pad use, an allergy to one of these components is worth investigating with a dermatologist before assuming it is a yeast infection or something else.

Fragranced pads are among the more common irritants. The perfumes used to mask odor can contain dozens of individual chemical compounds, and they serve no hygienic purpose. They just make the pad smell floral or “fresh.” If you have sensitive skin or have experienced vulvar irritation, switching to an unscented pad is one of the simplest and most evidence-backed steps you can take.

Choosing Lower-Exposure Pads

No regulatory agency publishes a ranked list of “safest” pad brands. In the United States, the FDA classifies menstrual pads as medical devices but does not require manufacturers to disclose all ingredients or contaminant levels on the packaging. That leaves you navigating the market with limited transparency. Still, a few principles hold up based on what the research shows.

Unscented, fragrance-free pads eliminate one of the most common sources of both allergens and added VOCs. The distinction between “unscented” and “fragrance-free” matters: unscented products can still contain masking fragrances designed to neutralize smell without adding a noticeable scent. Look for labels that explicitly say “fragrance-free.”

Chlorine-free or “totally chlorine-free” (TCF) pads skip the bleaching process most associated with dioxin formation. Elemental chlorine bleaching was the original concern, and most modern manufacturers have shifted to chlorine dioxide or hydrogen peroxide bleaching, which produces far less dioxin. The Japanese dioxin study confirmed that dioxin levels in pads bleached with modern methods were negligible.⁵ TCF pads go further by avoiding chlorine compounds entirely, which may appeal to people who want to minimize every possible source.

Organic cotton pads are marketed as having fewer synthetic chemicals, and there is some logic to this. The cotton is grown without synthetic pesticides, and organic pads tend to skip dyes, fragrances, and chlorine bleaching. What “organic” does not guarantee is the absence of all contaminants. Cotton can still pick up environmental pollutants during processing, and the adhesive backing and plastic wrapper are usually conventional. Organic certification addresses the agricultural inputs to the cotton fiber, not necessarily the finished product sitting in the package.

The enormous brand-to-brand variation in chemical levels is actually the most actionable finding in the research. Phthalate concentrations differed by more than 100-fold across brands, and VOC levels differed by nearly 6,000-fold.¹ That means the specific brand you buy matters enormously, potentially more than whether it says “organic” on the label. Unfortunately, without mandatory ingredient disclosure, consumers cannot easily tell which brands fall on which end of that spectrum.

Reusable Cloth Pads

Reusable cloth pads sidestep many of the concerns about disposable pad chemistry. They are typically made from cotton, bamboo, or hemp fabric, contain no superabsorbent polymers, and carry no adhesive backing. Because they are washed and reused, they do not contribute the ongoing exposure to fresh manufacturing residues that a new disposable pad does with each use.

One clinical trial compared hemp-based reusable pads to conventional disposable pads over the course of several menstrual cycles. The group using hemp pads had a lower rate of abnormal vaginal cleanliness (about 32% versus 44%) and a lower incidence of suspected vaginitis (about 15% versus 24%) compared to the disposable pad group.⁹ That is a single study and should be taken as suggestive rather than definitive, but it aligns with the general principle that less chemical contact with the vulvar area tends to be better for local tissue health.

The trade-off with reusable pads is practical. They require rinsing, washing, and drying between uses. Hygiene depends entirely on how well you maintain them: a cloth pad that is not washed thoroughly or is stored damp can harbor bacteria and fungi. If you choose reusable pads, washing them in hot water with a fragrance-free detergent and drying them completely before the next use keeps them sanitary.

The Superabsorbent Polymer Question

Most disposable pads contain a core layer of superabsorbent polymer (SAP), which is a petroleum-derived gel that can lock away many times its weight in fluid. SAPs are the reason modern pads are so much thinner than they were decades ago while still handling a full flow. Some researchers have raised concerns that SAPs in direct or near-direct contact with vulvar skin are not biodegradable and may be irritating.¹⁰

The irritation concern is worth keeping in proportion. SAPs have been used in menstrual pads and baby diapers for decades, and serious adverse events directly attributed to the polymer itself are rare. The greater concern is that SAP-based cores are wrapped in synthetic top sheets (often polypropylene) that form the layer actually touching your skin. Those synthetic layers can trap heat and moisture, creating conditions that favor irritation and microbial growth in people who are already prone to vulvar sensitivity.

If SAPs bother you conceptually or practically, pads that replace them with plant-based absorbent cores do exist. Researchers are actively developing alternatives, including bamboo fiber foams that achieve high porosity and strong absorbency without any petroleum-based polymer, though retention under pressure still needs improvement before these fully match conventional pads.¹¹

What Certifications and Labels Actually Tell You

Pad packaging often carries certifications that sound meaningful but vary in what they guarantee. Here is what the common ones actually cover:

USDA Organic: Applies to the cotton fiber used, certifying it was grown without synthetic pesticides or fertilizers. Does not certify the finished pad is free of all chemicals.
OEKO-TEX Standard 100: Tests the finished textile product for a list of harmful substances including phthalates, heavy metals, formaldehyde, and certain VOCs. A pad with this certification has been screened for contaminants in the final product, which is more relevant than an agricultural certification alone.
FDA-cleared: In the U.S., pads are classified as Class I medical devices. FDA clearance means the product meets basic safety and labeling requirements, but it does not require contaminant testing or ingredient disclosure at the level that food or drug products require.
Dermatologically tested: Means the product was patch-tested on human skin, usually for irritation. It does not mean the product is hypoallergenic or free of allergens, just that a test was conducted.

If chemical exposure is your primary concern, a certification like OEKO-TEX that screens the finished product for contaminants is more informative than an organic cotton label that only certifies the fiber source. Ideally you would look for both. In practice, very few brands carry both certifications, and when they do, they tend to be premium-priced.

Microplastics and Environmental Shedding

A dimension of pad safety that gets less attention but matters both to your body and to the broader environment is microplastic release. Most disposable pads contain multiple layers of plastic: the waterproof backing, the adhesive strip covering, synthetic top sheets, and the polymer core. These materials shed microplastic particles both during use (against your skin) and after disposal. The 2025 safety assessment study specifically quantified microplastics shed from commercial pads alongside VOC and cytotoxicity testing.²

Microplastic exposure through the vulvar route is a newer area of research and not yet well characterized in terms of health effects. The concern mirrors the broader worry about microplastics in food and water: tiny plastic fragments can carry adsorbed chemicals on their surface, and their fate in human tissue after absorption is not well understood. Pads that use fewer synthetic layers, or that replace plastic top sheets with cotton or bamboo fabric, reduce this particular exposure, though they may sacrifice some moisture-wicking performance.

Practical Steps That Actually Reduce Risk

Reducing your chemical exposure from menstrual pads does not require overhauling your entire routine or spending dramatically more money. A few targeted changes address the biggest sources of concern:

Go fragrance-free: Eliminates a top source of VOCs and contact allergens with no loss of function.
Try organic cotton or cloth options: Reduces exposure to synthetic polymers, dyes, and many of the detected contaminants. Even alternating between disposable and reusable pads cuts cumulative exposure.
Change pads frequently: A pad worn for four hours delivers less chemical exposure and creates a less hospitable environment for bacteria than one worn for eight hours. Frequent changes also reduce moisture buildup that can irritate skin.
Look for third-party certifications: OEKO-TEX Standard 100 is the most relevant for screening the finished product against harmful substances.
Watch your skin: Persistent vulvar itching, redness, or rash that correlates with your period may be contact dermatitis from your pad, not a vaginal infection. Switching brands or materials before seeking medication can sometimes resolve it.

If you have known chemical sensitivities, a history of vulvar dermatitis, or conditions like eczema that affect skin barrier function, being more selective about pad materials is especially worthwhile. For most people with healthy skin, conventional pads used as directed are unlikely to cause acute harm, but reducing unnecessary chemical contact with a highly absorptive area of your body is a reasonable precaution given what the research is revealing about what is actually in these products.

The Regulatory Gap

One frustration underlying this entire topic is that menstrual product regulation has not kept pace with the chemical detection science. In the United States, pads are regulated as medical devices but face minimal pre-market testing requirements compared to, say, a pharmaceutical drug. Manufacturers are not required to list all chemical ingredients on the package the way food and cosmetic producers are. Several states have passed or proposed menstrual product ingredient transparency laws, but a federal standard does not yet exist.

This means that the burden of figuring out what is in your pads falls largely on you, the consumer, or on independent researchers running small-scale analytical studies. The brand-to-brand variability documented in the phthalate and VOC research is not something you can see, smell, or feel. Two pads that look identical on the shelf can differ by orders of magnitude in their chemical load. Until disclosure rules tighten, certifications, organic labeling, and the fragrance-free principle remain the best tools available for making informed choices in an opaque market.

1
PubMed Central. Sanitary pads and diapers contain higher phthalate contents than those in common commercial plastic products
2
PubMed. Safety assessment of commercial sanitary pads: Cytotoxicity, volatile organic compounds, and microplastics release
3
PubMed. Per- and Polyfluoroalkyl Substances in Personal Hygiene Products: The Implications for Human Exposure and Emission to the Environment
4
Environmental Technology & Innovation. Occurrence of heavy metals in sanitary napkins from seven countries: Implication for risk management of female hygiene products
5
PubMed. Risk assessment study of dioxins in sanitary napkins produced in Japan
6
Fudma Journal of Sciences. Occurrence, Toxic Equivalency and Human Health Risk Assessment of Dioxin-like and Non-Dioxin-Like Polychlorinated Biphenyls in Sanitary Pads Produced in Nigeria
7
PubMed Central. Menstrual Products as a Source of Environmental Chemical Exposure: A Review from the Epidemiologic Perspective
8
Australasian Journal of Dermatology. Allergic contact dermatitis to a sanitary pad
9
PubMed Central. Effects of Hemp Sanitary Pads on the Vaginal Microecology
10
Bulletin of the National Research Centre. Development of biopolymer-based menstrual pad and quality analysis against commercial merchandise
11
BioResources. Liquid absorbent bamboo fiber foams: Towards 100% ligno-cellulosic menstrual absorbent pads