Even products marketed as 'natural' or 'eco-friendly' can contain PFAS, synthetic chemicals that accumulate in the environment and human tissue without ever fully breaking down. While switching to reusable menstrual products significantly reduces waste compared to disposables, a growing body of research reveals that the environmental and health benefits depend heavily on what chemicals are actually in the product you choose.

What Are PFAS and Why Do They Matter in Period Products?

PFAS stands for per- and polyfluoroalkyl substances, a family of over 12,000 synthetic chemicals used in manufacturing for their non-stick and moisture-resistant properties. They're called "forever chemicals" because they accumulate in the environment and in living tissue without ever fully breaking down. Research shows that PFAS appear in about 30% of reusable menstrual products, including underwear, pads, and cups, even though there are products proven to work perfectly well without them.

The concern extends beyond environmental persistence. PFAS chemicals have been linked to potential health effects including interference with hormone regulation and immune function. When these chemicals leach from period products into soil and water during manufacturing, use, and disposal, they contaminate ecosystems and drinking water supplies. Unlike traditional pollutants that break down over time, PFAS remain in the environment indefinitely, making prevention the only effective strategy.

How Do Disposable vs. Reusable Products Compare on Chemical Safety?

The environmental footprint of menstrual products extends far beyond plastic waste. Conventional disposable pads are made of up to 90% plastics and bleached wood pulp, and the bleaching process itself produces harmful dioxins, a class of toxic compounds that persist in the environment. Single-use products also contain plasticizers, chemicals added to plastics to make them soft and flexible, which release significantly higher amounts of plastic additives to the environment compared to reusable alternatives.

However, choosing reusable doesn't automatically mean choosing chemical-free. The presence of PFAS in some reusable products reveals a critical gap in manufacturing standards. Menstrual cups made from medical-grade silicone carry very low PFAS risk, while some period underwear brands have tested positive for these chemicals. Reusable cloth pads constructed primarily from cotton carry minimal risk when they lack synthetic water-resistant coatings.

Here's how chemical risks break down by product type:

• Conventional disposable pads: Contain plastic backing and adhesives that release plastic additives; PFAS risk ranges from low to moderate depending on manufacturing practices
• Organic cotton tampons: PFAS risk depends on applicator material; organic cotton certification does not guarantee PFAS-free status
• Reusable period underwear: About 30% of tested brands contain PFAS, likely from water-resistant coatings used to prevent leaks
• Silicone menstrual cups: Very low PFAS risk when made from medical-grade silicone without synthetic coatings
• Reusable cloth pads: Very low PFAS risk when constructed from cotton without synthetic water-resistant treatments

How to Choose Menstrual Products That Minimize Chemical Exposure

Making an informed choice requires looking beyond marketing claims and understanding what certifications actually verify. Here are the key steps to identify genuinely safer menstrual products:

• Look for third-party certifications: GOTS (Global Organic Textile Standard) certification verifies that organic cotton was grown without synthetic pesticides and processed without harmful chemicals. OEKO-TEX certification tests for harmful substances across the entire product. These certifications are more reliable than brand claims alone
• Verify PFAS-free status directly: Contact manufacturers to ask whether their products have been tested for PFAS and whether they use water-resistant coatings. Reputable brands should have test results available or be willing to provide them
• Prioritize medical-grade silicone for cups: Menstrual cups made from medical-grade silicone without synthetic coatings offer the lowest chemical risk combined with the lowest environmental footprint, lasting up to 10 years with minimal waste
• Understand what 'biodegradable' actually means: A product can only biodegrade under very specific conditions, like high heat and active composting, which most home compost bins or landfills don't provide. This label alone doesn't guarantee environmental safety
• Avoid products with synthetic fragrance or dyes: These additives leach into water and soil during manufacturing and disposal, contributing to chemical contamination beyond the product's direct use

The Scale of the Problem: Why This Matters Now

The stakes are significant. In the United States alone, 20 billion disposable menstrual products are discarded every year, filling landfills and washing into waterways constantly. While switching to reusables dramatically reduces this waste, the discovery of PFAS in approximately 30% of reusable products reveals that the industry has not yet fully addressed chemical safety alongside sustainability.

The issue is compounded by the fact that even products labeled "eco-friendly" may still contain plastic components or harmful chemical residues. Organic cotton certification, for example, verifies farming practices but does not guarantee that the finished product is free from synthetic coatings or PFAS-based water-resistant treatments applied during manufacturing.

Life cycle assessments, which measure environmental impact across every stage of a product's life from raw material extraction to manufacturing, use, and disposal, consistently show that menstrual cups break even with disposables after just one month of use and can deliver up to 99% lower carbon footprint over their 10-year lifespan. Reusable cloth pads and period underwear offer 60 to 80% lower environmental impact compared to disposables when used and washed efficiently.

The key takeaway is that choosing reusable menstrual products remains one of the most effective ways to reduce personal environmental impact, but the choice of which reusable product matters significantly. Prioritizing products with third-party certifications, verified PFAS-free status, and minimal synthetic coatings ensures that your choice benefits both your health and the environment.