The Best Non-Toxic Period Underwear of 2026
We scored 33 period underwear for PFAS forever chemicals and other hazards, then ranked them safest first. The top pick is Modibodi Modibodi Basic Mid-Rise Period Brief at 100/100. Every score below links to the full breakdown of what earned it.
82% of the 33 period underwear we scored fail our PFAS and toxin screen.
The safest PFAS-free period underwear we have scored
- 1
Modibodi
Basic Mid-Rise Period Brief
organic cotton blend with water-resistant coating
PFAS Grade100ExcellentOverall Grade92Excellent⏳70Water-resistant coating degradation
Limited concern
⚠️70Microbial growth and odor with improper care
Limited concern
Lower concern. MADE SAFE certified, PFAS-free claimed and tested.
✓ MADE SAFE✓Lab test found no PFAS
- 2
Lola
The Lola High Waist Period Underwear
organic cotton with water-resistant treatment
PFAS Grade100ExcellentOverall Grade92Excellent🫧70Water-resistant coating degradation and microplastic shedding
Limited concern
⚠️70Allergen sensitivity to cotton or treatment additives
Limited concern
Lower concern; PFAS-free certified, organic cotton base.
✓ MADE SAFE Certified✓ OEKO-TEX Standard 100✓Lab test found no PFAS
- 3
Lola
Organic Cotton Period Underwear
organic cotton with gusseted absorbent layer
PFAS Grade70GoodOverall Grade58Good💨70Formaldehyde / VOCs
Limited concern
🎨70Azo dyes and color fastness
Limited concern
🫧70Microplastic shedding
Limited concern
Lower concern. Organic cotton core, no water-resistant treatment disclosed.
⚠Risky category by default
- 4
Ruby Love
Women's Ruby Love Period Underwear Hipster
organic cotton with water-resistant treatment
PFAS Grade70GoodOverall Grade66Good🫧70Coating degradation and microplastic shedding over time
Limited concern
Lower PFAS concern. Third-party certified PFAS-free absorbent underwear.
✓ MADE SAFE Certified⚠Waterproof or stain-proof treatment
- 5
Icon Underwear
The High Waisted Period. in Organic Cotton For Heavy Flows
organic cotton with absorbent gusset
PFAS Grade70GoodOverall Grade44Poor🎨70Azo dyes in textile coloring
Limited concern
💨70Formaldehyde / VOCs
Limited concern
⚠️70Gusset absorbent chemistry (unknown)
Limited concern
⚠️70Antimony in polyester or nylon components
Limited concern
Lower concern. Organic cotton base unlikely to harbor PFAS.
⚠Risky category by default
- 6
Aisle
Super Hipster
Organic cotton, wood pulp fiber
PFAS Grade70GoodOverall Grade48Poor💨70Formaldehyde / VOCs
Limited concern
🧠70Lead
Limited concern
🫧45Wood pulp fiber degradation and microfiber shedding
Moderate concern
🏷️70Undisclosed water-repellent or antimicrobial coating
Limited concern
Lower PFAS concern for period care, though brand transparency is absent.
⚠Risky category by default
Every period underwear that passes, side by side
Sorted by score. Higher is safer. Scored against 3 hazards that apply to this category.
| # | Period Underwear | Score | Rating | Made of |
|---|---|---|---|---|
| 1 | Modibodi Modibodi Basic Mid-Rise Period Brief | 100 | Excellent | organic cotton blend with water-resistant coating |
| 2 | Lola The Lola High Waist Period Underwear | 100 | Excellent | organic cotton with water-resistant treatment |
| 3 | Lola Organic Cotton Period Underwear | 70 | Good | organic cotton with gusseted absorbent layer |
| 4 | Ruby Love Women's Ruby Love Period Underwear Hipster | 70 | Good | organic cotton with water-resistant treatment |
| 5 | Icon Underwear The High Waisted Period. in Organic Cotton For Heavy Flows | 70 | Good | organic cotton with absorbent gusset |
| 6 | Aisle Super Hipster | 70 | Good | Organic cotton, wood pulp fiber |
The period underwear we would skip
Lowest scoring in this category, worst first.
Modibodi
Basic Mid-Rise Brief Black
Organic cotton with waterproof leak-proof lining
PFAS
Limited concern
Microorganism growth if improperly dried
Limited concern
Coating degradation over repeated washing
High concern
Contact dermatitis or skin irritation
Limited concern
Waterproof period underwear; PFAS risk unknown, brand silent on treatment.
⚠Waterproof or stain-proof treatment
Modibodi
Classic Full Period Briefs
Organic cotton blend with unspecified waterproof/absorbent coating
Undisclosed waterproof coating chemistry
High concern
Formaldehyde / VOCs
Limited concern
Azo dyes and synthetic colorants
Limited concern
Coating degradation and microparticle shedding
Moderate concern
Skip until Modibodi discloses waterproof coating chemistry.
⚠Waterproof or stain-proof treatment
Modibodi
Basic Full Period Brief
Organic cotton, lycra blend with waterproof gusset treatment
Synthetic polymer leaching from lycra/gusset coating
Limited concern
Skin sensitization or irritation from coating degradation
Moderate concern
Microplastic shedding from synthetic components
Limited concern
Waterproof period underwear; PFAS use in gusset unclear from brand.
⚠Waterproof or stain-proof treatment
What we check on period underwear
- Formaldehyde / VOCs. Off-gassing chemicals from some finishes, textiles, and pressed wood. ATSDR
- Endocrine disruptors. Chemicals that interfere with the body’s hormone system. NIEHS
- Phthalates. Plastic softeners studied for endocrine effects. ATSDR
Full point-by-point rubric on the methodology page.
The period underwear brands that will not say
9 of the brands here publish nothing about PFAS at all. Silence is not evidence of harm, but it is why none of them score well on disclosure.
Aisle, Icon Underwear, Knix, Lola, Modibodi, Proof, Ruby Love, Saalt, Thinx.
Common questions about PFAS-free period underwear
Is period underwear PFAS free?
Mostly not. Of the 33 period underwear we have scored, 82% fail our PFAS and toxin screen, which leaves 6 that pass. The highest scoring is Modibodi Modibodi Basic Mid-Rise Period Brief at 100 out of 100. The lowest is Modibodi Modibodi Basic Mid-Rise Brief Black at 25.
What is the safest period underwear you have scored?
Modibodi Modibodi Basic Mid-Rise Period Brief, at 100 out of 100, which we band as Excellent. It is organic cotton blend with water-resistant coating. The runner up is Lola The Lola High Waist Period Underwear at 100.
Which period underwear should I avoid?
The three lowest scoring we hold are Modibodi Modibodi Basic Mid-Rise Brief Black at 25, Modibodi Modibodi Classic Full Period Briefs at 25, Modibodi Modibodi Basic Full Period Brief at 25. The problem with the first is that waterproof period underwear; PFAS risk unknown, brand silent on treatment.
How can you tell if period underwear contain PFAS?
In this category we check for formaldehyde / vocs, endocrine disruptors, phthalates. Off-gassing chemicals from some finishes, textiles, and pressed wood. Language like stain resistant, water repellent or easy release usually means fluorinated chemistry even when PFAS is never printed on the box.
Which period underwear brands will not say whether they use PFAS?
9 of the brands we scored in this category publish nothing about PFAS at all, including Aisle, Icon Underwear, Knix, Lola, Modibodi, Proof. Silence is not evidence of harm, but it is the reason those brands cannot score well on disclosure.
Do you lab test period underwear?
No. We score from published ingredient lists, materials, certifications, disclosures and third party lab results where they exist. Where a product has been independently tested we use that result and say so.
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We also wrote this up at length. PFAS in Period Underwear: Which Brands Grade Best and Worst
Want to filter the whole category yourself? Browse all 33 period underwear.