Feminine hygiene products (tampons, pads, menstrual cups) — safety profile

What is this product?

Conventional feminine hygiene products — tampons, menstrual pads, panty liners — are applied to or inserted in the most absorptive mucosal tissue in the body. The vaginal mucosa has significantly higher permeability to chemical absorption than skin, with no first-pass liver metabolism for absorbed compounds — chemicals absorbed vaginally enter systemic circulation more efficiently than dermally absorbed compounds. The primary chemical concerns are: (1) dioxins and furans from chlorine bleaching of cotton and rayon in conventional products; (2) PFAS compounds, found in 2023 independent testing of multiple major tampon brands; (3) synthetic fragrances in 'scented' pads and tampons; (4) pesticide residues in non-organic cotton; and (5) carcinogenic volatile compounds in rayon (acetaldehyde, methylene chloride from the rayon manufacturing process). The FDA classifies tampons as Class II medical devices — but requires no pre-market testing for chemical migration from tampon materials into vaginal tissue, and requires no ingredient disclosure on tampon packaging. Consumers have historically had no access to ingredient information for products used monthly for decades.

What's in it

Click any compound name for its full safety profile, regulatory consensus, and exposure data.

Who's most at risk

• Pregnant Women — Dermal absorption of endocrine disruptors; fetal exposure
• Children — Thinner skin, higher surface-area-to-body-weight ratio

How to use it more safely

• Change tampons every 4-8 hours to reduce TSS risk
• Use lowest absorbency needed for your flow
• Wash hands before insertion and removal
• Follow product-specific insertion instructions carefully

Red flags — when to walk away

• Scented, deodorizing, or 'fresh'-labeled menstrual products — Synthetic fragrance in contact with vaginal or vulvar tissue is associated with contact dermatitis, vulvodynia, and microbiome disruption. ACOG recommends against scented feminine hygiene products. The fragrance conceals unknown chemical mixtures including potential endocrine disruptors. There is no demonstrated benefit from scented menstrual products — the scent does not improve hygiene and introduces additional chemical exposure.
• Conventional (non-organic) tampon or pad with no ingredient disclosure — Conventional products contain rayon (chlorine-bleached, potentially dioxin-contaminated) and conventional cotton (pesticide residues) with no obligation to disclose these components. Without ingredient disclosure, consumers cannot assess PFAS presence, fragrance content, or processing chemical residues. The FDA does not require tampon ingredient disclosure — this information gap was closed only in 2024 when Congress passed the Menstrual Products Right to Know Act requiring basic ingredient disclosure.

Green flags — what to look for

• GOTS-certified organic cotton, unscented, with full ingredient disclosure — GOTS certification covers the organic agricultural standard and processing requirements including prohibition of chlorine bleaching. Unscented eliminates fragrance concerns. Full ingredient disclosure allows verification. This combination addresses the primary chemical concerns: dioxins (from bleaching), pesticide residues (from conventional agriculture), and fragrance.
• Medical-grade silicone menstrual cup with FDA 510(k) clearance — FDA 510(k) clearance for menstrual cups requires biocompatibility testing of the silicone material — confirming the material is safe for internal mucosal contact. Medical-grade silicone with FDA clearance represents the most chemically characterized and lowest-risk option in this product category.

Safer alternatives

• Menstrual cups — Reusable, lower TSS risk, longer wear time (12 hours)
• Period underwear — No insertion required, washable, reduces chemical exposure
• Cloth pads — Reusable, chemical-free, better for sensitive skin

Frequently asked questions