FemmyCycle · Menstrual Cups
Flex Menstrual Cup
Lower PFAS concern, silicone cups lack typical PFAS vectors, but brand silence on sourcing limits full confidence.
FemmyCycle's Flex cup is made from medical-grade silicone, a material not known to require PFAS coatings or treatments. Menstrual cups have no water-repellency, non-stick, or stain-resistance features that typically drive PFAS use.
Shop FemmyCycle on Amazon →Material
Medical-grade silicone
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
period care is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
The full breakdown
What it's made of and why it matters
The Flex Menstrual Cup is constructed from medical-grade silicone, a synthetic polymer engineered for biocompatibility and durability in prolonged skin contact. Medical-grade silicone does not contain plasticizers like phthalates or BPA, and it is chemically inert under normal body temperature and pH conditions. The material is not prone to degradation or leaching of heavy metals when used as directed. Silicone's main advantage over elastomer alternatives is its resistance to odor absorption and its longevity over years of use.
The brand's record and disclosure
FemmyCycle has not published detailed material sourcing or third-party safety certifications on public record. The brand does not explicitly address PFAS content or supplier vetting standards, which represents a transparency gap rather than evidence of contamination. No major safety recalls or adverse event reports specific to FemmyCycle cups have been established in FDA databases or consumer safety summaries. The company markets the product as medical-grade but does not disclose third-party testing results or ISO/USP compliance documentation publicly.
How it compares in its category
Silicone menstrual cups generally rank lower-risk than disposable alternatives (tampons, pads) which may contain undisclosed fragrances, chlorine bleach residues, or rayon fibers. Most established menstrual cup brands (Saalt, Lunette, Diva Cup) similarly use medical-grade silicone with comparable hazard profiles. FemmyCycle's lack of third-party certification is not unique in the menstrual cup market, though some competitors publish ISO 13485 or FDA 510(k) documentation. The main safety differentiation in this category is insertion technique and hygiene maintenance, not material composition among silicone-based products.
If you buy it
Rinse thoroughly with water before first use and after each cycle. Boil for 5-10 minutes between cycles to sanitize, or use a cup-specific sterilizer; do not exceed 100°C as sustained high heat can degrade silicone bonds over years. Replace the cup if you notice cracks, discoloration, staining that does not wash out, or a persistent odor that boiling does not eliminate, typically after 5-10 years of use. Do not use oil-based lubricants; water-based lubricant is safe if needed for insertion.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Silicone degradation and odor retention
Medical-grade silicone can absorb menstrual odors over time and may develop discoloration with age or if exposed to high heat repeatedly. This is a durability issue rather than a toxicity risk, but degraded material may harbor bacteria if not cleaned properly.
Bacterial contamination from improper cleaning
Menstrual cup-related infections and irritation are documented in medical literature and linked to poor sterilization or storage in damp conditions. This hazard is user-dependent, not material-inherent, but silicone's porous surface can trap bacteria if boiling is skipped.
Insertion injury or allergy to silicone
Allergic contact dermatitis or mechanical irritation from the cup rim is rare but possible, especially in users with sensitive vulvar skin or latex cross-reactivity. Medical-grade silicone is hypoallergenic for most users, but individual variation exists.
Heavy metals or additives in source silicone
No documented cases of heavy metal leaching (cadmium, lead, antimony) from medical-grade silicone menstrual cups have been reported. FemmyCycle's lack of published material sourcing limits verification, but silicone chemistry does not naturally accumulate or leach metals under normal use.
BPA or phthalate migration
Medical-grade silicone does not contain BPA or phthalate plasticizers by formulation. This hazard class is not applicable to silicone menstrual cups, unlike some plastic competitors.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
Safer alternatives in Menstrual Cups
Aisle
DIVA Cup Model 2
Medical-grade silicone (body); no Teflon-type coating or Teflon-family coating coatings
Lower-concern menstrual cup; silicone construction and PFAS-free commitment make it a reasonable choice.
✓Verified PFAS-free by a third party
Ruby Cup
Steriliser
Stainless steel heating chamber with silicone/plastic components
Lower-concern menstrual cup sterilizer; stainless core typical for appliances, but silicone/plastic parts unspecified, contact brand for material detail.
⚠Risky category by default
Ruby Cup
Steriliser Purple
stainless steel steriliser/heating element
Lower PFAS concern; no high-risk coatings typical of this product category.
⚠Risky category by default
More menstrual cups grades
How we score: every product runs through the same public 0–100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.