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PFAS 'Forever Chemicals': Are They in Your Tampons?

What Are PFAS 'Forever Chemicals,' Exactly?

PFAS, or per- and polyfluoroalkyl substances, are a group of over 12,000 synthetic chemicals used in consumer products since the 1940s. According to the Johns Hopkins Bloomberg School of Public Health, the carbon-fluorine bond in these chemicals is one of the strongest in all of chemistry. That means PFAS don't break down in the environment or in your body, hence the nickname: "forever chemicals."

You've probably encountered PFAS without knowing it. They're in non-stick cookware, waterproof jackets, stain-resistant fabrics, and food packaging. The National Institute of Environmental Health Sciences cites CDC data finding PFAS in the blood of 97% of Americans. That's not a typo. Ninety-seven percent.

The health concerns are serious. In 2023, the World Health Organization classified PFOA (one of the most studied PFAS compounds) as carcinogenic to humans and PFOS as possibly carcinogenic, according to Stanford Medicine. Research has linked PFAS exposure to kidney cancer, testicular cancer, reduced fertility, and melanoma. When these chemicals show up in period products, it's worth paying very close attention.

So… Are PFAS Actually in Tampons?

Short answer: in some of them, yes. A consumer study by Mamavation and Environmental Health News sent 23 tampon products to an EPA-certified lab and found that 22% showed detectable organic fluorine (at 19 to 28 parts per million), a strong indicator of PFAS presence. The contamination was considered unintentional, likely originating somewhere in the supply chain rather than being deliberately added.

But tampons aren't the only concern. In a broader series of lab analyses conducted between 2020 and 2022, Time reported that 48% of sanitary pads, incontinence pads, and panty liners tested contained PFAS. Even more alarming, 65% of period underwear tested positive.

How do PFAS end up in these products? There are two main pathways. First, intentional use: PFAS are sometimes added as moisture-barrier coatings, especially in reusable pads and period underwear. Second, unintentional supply chain contamination can affect even cotton-based products during processing, packaging, or manufacturing.

A quick note on testing methodology: organic fluorine testing is an industry-standard screening method that measures total fluorine content as an indicator of PFAS presence, rather than identifying specific compounds. It's not a definitive fingerprint, but it's the best screening tool widely available.

And if you assumed reusable products were automatically safer, a 2025 study reported by the National Center for Health Research found that all reusable menstrual cups, pads, and underwear tested contained PFAS. Intentional use was suspected in about one-third of those samples. Reusable doesn't automatically mean chemical-free.

The 'Organic' Label Loophole You Need to Know About

Here's where things get frustrating. Of the 22 products that tested positive for PFAS in the Mamavation study, 13 were marketed using terms like "organic," "natural," "non-toxic," or "sustainable." That's more than half. Let that sink in.

Why does this happen? Certifications like GOTS (Global Organic Textile Standard) cover the cotton fiber itself, but they don't govern every step of the supply chain. Processing aids, packaging materials, and manufacturing equipment can all introduce PFAS contamination after the cotton has been certified organic.

Then there's label language that sounds reassuring but doesn't mean much. "PFOS and PFOA free"? Those are only 2 of over 12,000 known PFAS compounds, as the Environmental Working Group has pointed out. "No intentionally added PFAS"? That doesn't mean the product has been tested and verified clean. It means the manufacturer didn't deliberately put PFAS in it.

So what should you actually look for? Third-party testing for total fluorine, MADE SAFE certification, and OEKO-TEX STANDARD 100 testing on finished products are all stronger signals. Look for brands that publish their test results transparently.

Your quick checklist of questions to ask any tampon brand:

  • Do you test your finished products (not just raw materials) for total fluorine or PFAS?
  • Can you share those test results publicly?
  • Do your material suppliers use PFAS at any stage of manufacturing or processing?
  • What third-party certifications do your products carry beyond "organic cotton"?

If a brand can't or won't answer these questions, that tells you something.

Why Vaginal Exposure to PFAS Is a Bigger Deal Than You Might Think

Vaginal tissue is not like the skin on your arm. It is highly permeable and far more vascular, meaning chemicals that come into contact with it can be absorbed more readily into the bloodstream. According to the Harvard Petrie-Flom Center, chemicals absorbed vaginally bypass first-pass liver metabolism, meaning they can enter your bloodstream more directly than chemicals absorbed through other areas of skin.

Consider the cumulative picture. The average menstruating person uses an estimated 11,000 to 12,000 tampons over their reproductive lifetime, and a Harvard University study estimated that people who menstruate spend approximately 2,540 days of their lives menstruating. That's nearly seven years of repeated, intimate contact with whatever is in your period products.

We want to be honest with you: direct studies on how much PFAS actually leaches from tampons into vaginal tissue are still limited. Researchers from Indiana University have flagged dermal absorption as a "potentially significant exposure pathway" for PFAS in feminine hygiene products. The fact that we don't yet have definitive answers about vaginal absorption isn't a reason to relax. It's a reason to be more cautious.

What the FDA Is (and Isn't) Doing About It

The FDA classifies tampons as Class II medical devices. That sounds like it should come with rigorous safety oversight, but it doesn't. The FDA does not require manufacturers to test for PFAS or heavy metals. Its recommendations focus narrowly on pesticide and herbicide residues and two specific persistent organic pollutants (TCDD and TCDF). The FDA's last guidance to the tampon industry was issued in 2005, over 20 years ago.

Fortunately, states are stepping in where the federal government has not. Vermont became the first U.S. state to ban PFAS in menstrual products, with the law taking effect in 2026. New York Governor Kathy Hochul signed a similar ban in December 2025, effective approximately December 2026. California (AB 2515), Colorado, and Minnesota have also enacted or are phasing in bans on intentionally added PFAS in menstrual products, as reported by Manufacturing Dive.

The legislative momentum is striking. According to MultiState, in 2025 alone, nearly 350 PFAS bills were introduced across 39 U.S. states, with 27 bills enacted in 13 states. The tide is turning, but slowly. Right now, the burden of navigating PFAS risk still falls on you, the consumer, not the manufacturers. That's exactly why knowing what to look for matters so much.

How to Choose a Truly PFAS-Free Period Product

Start with the basics: look for brands that use 100% certified organic cotton with a transparent, third-party verified supply chain. A front-of-pack "organic" claim isn't enough on its own. You need to dig a little deeper.

Here's what the key certifications actually mean:

  • GOTS (Global Organic Textile Standard) covers the organic fiber and its processing, ensuring no toxic chemicals are used during manufacturing.
  • OEKO-TEX STANDARD 100 tests the finished product for a wide range of harmful substances, including certain PFAS compounds.
  • MADE SAFE certifies products against a comprehensive list of known toxic chemicals, including PFAS.

Don't be afraid to ask brands directly: Do you test your finished products for total fluorine or specific PFAS compounds? Can you share those results? Do your material suppliers use PFAS at any stage? Brands genuinely committed to clean ingredients will welcome these questions, not dodge them.

If you prefer reusable period products, be aware that period underwear and reusable pads carry a higher PFAS risk due to intentional use of PFAS as moisture barriers. If you go the reusable route, choose brands that publish third-party PFAS test results.

For everyday period care, subscription-based organic tampon brands with rigorous sourcing standards and published ingredient transparency offer a practical, lower-risk choice. When a brand is willing to show you exactly what's in their products and how they're made, that's a signal you can trust.

The Bottom Line: You Deserve Better Than 'We Haven't Checked'

Here's what we know: PFAS have been found in some tampons and many other period products. The FDA isn't requiring testing. And "organic" labels alone aren't enough to guarantee your products are clean. This isn't about fear. It's about informed choice and demanding real transparency from the brands and regulators that are supposed to have your back.

Your purchasing power matters. Every time you choose a certified, transparently sourced period product, you're sending a market signal the industry can't ignore. Support state PFAS bans. Ask brands the hard questions. Share this information with the people in your life who menstruate.

You spend thousands of days of your life menstruating. You use thousands of products over your lifetime. You deserve to know exactly what's in them. Your body, your standards, your tribe.

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