PFAS in Period Underwear, Which Brands Grade Best and Worst

Based on available materials and public disclosure data Modibodi Modibodi Basic Mid-Rise Period Brief and Lola The Lola High Waist Period Underwear currently top our database with an Excellent, 100/100 model-based estimate, meaning reviewed sources show no evidence of PFAS in their construction. That is a notably different story from other items in the same product lines, including three Modibodi styles that land in Poor territory at 25/100. Period underwear is a category where PFAS risk hides in plain sight, the absorbent, leak-proof, and odor-resistant layers that make the product functional are the same layers where PFAS-based durable water repellent (DWR) finishes are historically common.

The split we found inside single brands is the real headline here. Modibodi, for example, has both the best-graded and worst-graded products in our dataset, which tells you that a brand name alone is not a reliable proxy for PFAS status. Style, fabric treatment, and absorbency technology all matter more than the logo on the label. Below, we break down every graded product, explain what is actually verified versus brand-claimed, and point you toward the styles that carry lower estimated concern based on current data.

Summary Comparison

Product	PFAS Grade (Model Estimate)	Verdict
Modibodi Basic Mid-Rise Period Brief	Excellent (100/100)	Lower concern based on reviewed materials
Lola The Lola High Waist Period Underwear	Excellent (100/100)	Lower concern based on reviewed materials
Lola Organic Cotton Period Underwear	Good (70/100)	Reasonable estimate, some gaps in disclosure
Lola LOLA Washable Period Underwear	Good (50/100)	Mid-tier, more uncertainty in materials data
Lola Bikini Period Underwear	Good (50/100)	Mid-tier, more uncertainty in materials data
Modibodi Basic Full Period Brief	Poor (25/100)	Higher estimated concern, avoid if minimizing exposure
Modibodi Classic Full Period Briefs	Poor (25/100)	Higher estimated concern, avoid if minimizing exposure
Modibodi Basic Mid-Rise Brief Black	Poor (25/100)	Higher estimated concern, avoid if minimizing exposure

The Excellent-Grade Products

Modibodi Basic Mid-Rise Period Brief

This style uses Modibodi's standard mid-rise brief construction with a layered gusset for absorbency. Modibodi's brand-stated position is that its products are designed without intentionally added PFAS in the absorbent core. Based on the materials and disclosure data we reviewed, this specific style scores 100/100 in our model, our highest lower-concern estimate. This is a model-based estimate from materials and public disclosure, not a lab test, so it should be read as a strong directional signal rather than a certified result. Pros, high estimated score, mid-rise fit works for daily wear, part of a well-established period-underwear line. Cons, colorways and specific print runs are not covered by this grade, and the near-identical Basic Mid-Rise Brief Black variant below scores dramatically lower, underscoring how color or finish changes can shift the estimate.

Lola The Lola High Waist Period Underwear

Lola's high-waist style also lands at 100/100 in our estimate. The brand markets this line around organic cotton content and a focus on transparency in materials sourcing. As with all grades on this site, this reflects available public data and materials disclosure, not an independent lab verification of zero PFAS. Pros, high-waist coverage, brand emphasis on organic cotton, top-tier estimated score. Cons, brand claims about materials have not been independently lab-verified in the sources we reviewed, and Lola's own product line shows meaningful score variation style to style.

The Mid-Tier "Good" Products

Lola Organic Cotton Period Underwear

Scoring 70/100, this style sits comfortably above average but below the top tier. The organic cotton claim is brand-stated. The gap between this and Lola's 100/100 high-waist style, despite the shared brand, suggests differences in trim, elastic, or absorbent-layer treatment that our model weighs into the estimate. Pros, organic cotton marketing, reasonable estimated score. Cons, not equivalent to the brand's best-scoring item, and shoppers should not assume "organic cotton" on the label guarantees a PFAS-free result.

Lola LOLA Washable Period Underwear and Lola Bikini Period Underwear

Both score 50/100, a middle-of-the-road estimate that reflects more uncertainty in the underlying materials data available to us. Neither product carries a Poor grade, but neither reaches the confidence level of Lola's top-scoring styles. Pros, reusable, washable design reduces landfill waste versus disposable pads. Cons, based on available data, these carry meaningfully more estimated concern than Lola's best styles, and the bikini cut in particular has less publicly disclosed material detail than the brand's other lines.

What to Avoid

Three Modibodi styles, the Basic Full Period Brief, the Classic Full Period Briefs, and the Basic Mid-Rise Brief Black, all land at Poor, 25/100, in our model. This is the same brand that also produces our two highest-graded items, so the takeaway is not "avoid Modibodi" but "avoid these specific styles based on current data." Full-coverage briefs and darker colorways often rely on different fabric treatments and dye processes, which can correlate with higher estimated PFAS-related concern in our model. If you are trying to minimize exposure, these three products are the ones in our database that currently warrant the most caution, and association between PFAS exposure and health effects reported in outside research is not the same as causation for any individual product or wearer.

More broadly, when shopping outside our graded list, be skeptical of vague marketing language like "stain-resistant," "moisture-wicking," or "odor-control" without a specific materials disclosure, since these functional claims have historically been achieved with PFAS-based finishes across textiles, including activewear and outdoor gear like rain jackets and waterproof boots. A brand simply saying "PFAS-free" on packaging is a brand-stated claim, not automatically a third-party verified one, unless it cites an independent lab report.

Our Pick

Based on available materials and disclosure data, the Modibodi Basic Mid-Rise Period Brief and the Lola The Lola High Waist Period Underwear are the two styles in our database with the lowest estimated PFAS-related concern, each scoring 100/100. Neither claim should be read as "PFAS-free" or "safe" in an absolute sense, these are model-based estimates drawn from materials and public disclosure, not independent lab certification. If you want a reusable option with a stronger data profile than Lola's washable or bikini styles, the high-waist version is currently the better-documented choice in that line. For a broader look at how other period-care and textile categories compare, visit our period underwear finder to compare additional graded products side by side.

FAQ

Does a high PFAS grade mean the product is guaranteed PFAS-free?

No. A high grade in our system reflects a model-based estimate from available materials and public disclosure data, not a laboratory test result. It means reviewed sources showed no evidence of PFAS, which is different from a certified, lab-confirmed absence of PFAS.

Why do two products from the same brand have such different grades?

Fabric treatments, dye processes, absorbent-layer construction, and colorway can all vary style to style within one brand. Modibodi's product line illustrates this clearly, with one style scoring 100/100 and three others scoring 25/100, so brand reputation alone should not be treated as a reliable PFAS indicator.

Is there a proven health risk from wearing period underwear with PFAS?

Outside research has associated PFAS exposure with various health concerns, but association is not the same as causation for any specific product or individual. Our grades are meant to help you compare estimated PFAS-related concern across products, not to make medical claims. For general guidance across categories, see our product finder.