Is Period Underwear Safe? What to Know

Period safety guide

Quick answer

Based on what experts know today, there is no proof that period underwear harms your health. Some tests have found PFAS, a group of man-made chemicals, in some brands. So it's fair to ask questions. Ask any brand for its lab results, and change and wash your pairs on time.

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Kischt Period Underwear, Noir (black), $24.95. 30-day returns. Free shipping over $50.

Hands checking the fabric label on black period underwear to see what it is made of
  • Experts say there's no proof PFAS in period underwear harms health.
  • Ask any brand for third-party lab results.
  • Words like green or clean can mean different things.
  • Change it when it feels damp or full, and wash after each wear.
  • Kischt is made of nylon and elastane. Questions? Email hello@kischt.com.
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Why do people worry about PFAS?

PFAS are a big group of man-made chemicals. They help things like clothes and carpets resist water and stains. Some PFAS may be linked to health problems. Scientists are still learning more.

Tests have found PFAS in some period underwear. But poison control experts say there is no proof yet that this harms health.

How to choose safe period underwear

  1. Know the fabric

    Pick a brand that tells you what its underwear is made of.

  2. Ask about PFAS

    Ask if PFAS are added on purpose. Ask for third-party lab results, too. Third-party means an outside lab, not the brand.

  3. Read labels with care

    Words like green or clean can mean different things. Poison control experts say to treat green labels with caution.

  4. Change it on time

    Change it when it feels damp, full or uncomfortable. The FDA says wearing any period product too long can let germs grow.

  5. Wash after each wear

    Rinse it in cold water, wash it on a gentle cycle, and let it dry fully. Always check the care label.

    Hands rinsing black period underwear under cold water before washing it

What does non-toxic period underwear mean?

There's no single meaning. All fabric is made of chemicals, even cotton. So a better question is which chemicals, and did a lab test for them? Ask the brand to share its lab results.

Kischt Period Underwear, Noir (black)

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Kischt Period Underwear, Noir (black) · $24.95

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Questions? Email hello@kischt.com.

Common questions

Is period underwear toxic?

Poison control experts say there's no proof that PFAS in period underwear harms health. Some tests found PFAS in some brands, so ask any brand for its lab results.

What is the safest period underwear?

Look for a brand that lists its fabric, answers your questions and shares lab results. Then change and wash your pairs on time.

Is there chemical-free period underwear?

No fabric is free of chemicals. Even cotton is made of them. A better question is which chemicals a brand tests for.

Can period underwear cause infections?

The FDA says wearing any period product too long can let germs grow. Change it when it feels damp or full, and wash it after each wear.

What is Kischt period underwear made of?

Soft, breathable nylon and elastane. Kischt does not have PFAS lab results to share at this time. Email hello@kischt.com with any questions.

More guides

See all guides: Period Underwear Guide: Every Question Answered

Sources

  1. Poison Control (National Capital Poison Center): Is Period Underwear Safe to Use?
  2. NASPAG: Response to Headlines Concerning PFAS in Period Underwear
  3. CDC / ATSDR: PFAS Information
  4. New Jersey Department of Health: Period Underwear
  5. University of Notre Dame: PFAS in Reusable Feminine Hygiene Products (July 2025)
  6. FDA: Menstrual Product Options, Facts, and Safe Use

Updated by the Kischt team.

This page is general information, not medical advice. See a doctor if you are worried about your health.

Returns: you have 30 days after you get your order to request a refund. Details are in the return policy.