The eyelid is the thinnest skin on the body — about 0.55 mm — sitting 1–2 mm from the tear duct. Eye makeup stays on 12–16 hours. That combination is why the chemistry of your eyeliner and mascara is worth looking at closely.
The absorption problem for eye makeup
Thin skin absorbs more. The eyelid area specifically has a very high permeability compared to other body regions. Conventional eye makeup sits on the most absorbent patch of the face, closest to a mucous membrane, for the longest duration of any beauty product. What goes on at 8 a.m. is still there at midnight.
Eye makeup typically stays on for 12–16 hours — longer than any other facial product. The eyelid sits just 1–2 mm from the tear duct, which connects directly to mucous membranes. Eyelid skin has been shown to be significantly more permeable than cheek skin, meaning ingredients applied here have a shorter path inward.
What conventional eye makeup actually contains
Most eye makeup ingredients are not tested for eye-area permeability before reaching shelves. Four categories stand out:
1. PFAS (“forever chemicals”)
A 2021 University of Notre Dame study (Whitehead et al., Environmental Science & Technology Letters) found PFAS markers in 82% of waterproof mascaras — and in most cases they were not listed on the label. PFAS are used to create smudge-proof, long-wearing formulas. The US CDC/ATSDR links high PFAS exposure to effects on kidneys and thyroid.
2. Formaldehyde-releasing preservatives
Quaternium-15 and DMDM hydantoin are among the most-reported triggers of eyelid contact dermatitis. They release low levels of formaldehyde to preserve the formula.
3. Heavy metal traces
Conventional eyeliners and mascaras have been found to contain trace amounts of lead, nickel, and chromium — detected in product testing, not listed on labels.
4. Synthetic fragrance and colorants
Eye products carrying “Parfum” conceal an unknown number of potential allergens, and some conventional coal-tar dyes (CI numbers) can degrade into carcinogenic amines under certain conditions.
Conventional eye makeup vs ECOCERT COSMOS certified — side by side
| Category | Conventional eye makeup | Born to Bio ECOCERT COSMOS certified |
|---|---|---|
| Waterproofing agents | PFAS film-formers (found in 82% of waterproof mascaras) | No PFAS — not permitted under COSMOS |
| Preservatives | Formaldehyde-releasing (Quaternium-15, DMDM hydantoin) | COSMOS-approved preservatives only |
| Heavy metal traces | Detected in some products (lead, nickel, chromium) | Absent from certified-organic formulas |
| Fragrance | “Parfum” — undisclosed allergens | Named allergens listed individually |
| Eyelid-safety tested | No specific requirement | Ophthalmologist-tested |
| Staying power mechanism | Chemical polymer film-formers (some PFAS-based) | Removes with warm water — intentional trade-off |
What ECOCERT COSMOS certifies for eye makeup
PFAS, formaldehyde releasers, and synthetic polymer film-formers are all prohibited under the COSMOS standard. The certification requires the formula to be submitted for ophthalmologist testing — a specific eye-area safety step conventional cosmetics do not require.
Read the full science on certified-organic cosmetics.
Why clean eye makeup costs more
Clean eye makeup costs more because every ingredient is sourced from COSMOS-approved suppliers, the formula is submitted for ophthalmologist testing (a specific extra certification step), and Born to Bio is manufactured in France to pharmaceutical-grade quality controls — not outsourced to low-cost contract labs.
- PFAS film-formers for waterproofing
- Formaldehyde-releasing preservatives
- Heavy metal traces (lead, nickel, chromium)
- “Parfum” — undisclosed allergens
- No ophthalmologist safety test required
- Zero PFAS — not permitted under COSMOS
- COSMOS-approved preservatives only
- No heavy metals in certified-organic formula
- Named allergens disclosed individually
- Ophthalmologist-tested for eye area safety
Certified-organic makeup for your eyes
Three formulas — each ECOCERT COSMOS certified, ophthalmologist-tested, and made in France. Remove with warm water.
What to look for on any eye makeup label
Avoid: any ingredient containing “-PFAS”, “PTFE”, “polyfluoro”, Quaternium-15, DMDM hydantoin, or “Parfum.”
Look for: an ophthalmologist-tested claim with a certification number to verify — not a brand’s own badge.
Frequently asked questions about organic eye makeup
Is organic mascara as effective as waterproof mascara?
Certified-organic mascaras hold well through a normal day but are not “plastic-strong” waterproof — that staying power comes from PFAS or synthetic film-formers, which we don’t use. The trade-off is intentional and the removal (with warm water) is kinder to lashes over time.
Why is eyeliner and mascara more risky than other makeup to leave on?
The eyelid is the thinnest skin on the body — about 0.55mm — and sits directly next to the tear duct. Both of those factors mean ingredients in eye makeup have a shorter path to mucous membranes and the eye’s direct surface than any other product.
What are PFAS and why are they in conventional eye makeup?
PFAS (per- and polyfluoroalkyl substances) are synthetic chemicals that create the long-wearing, smudge-proof property in most waterproof mascaras and eyeliners. They don’t break down — in the environment or the body — which is why they’re called “forever chemicals.” They are not disclosed on most ingredient lists.
Can I check if an eye makeup product contains PFAS?
Often not from the label, because PFAS are frequently undisclosed. The most reliable route is to choose products certified by ECOCERT COSMOS — which prohibits them by standard — or to search a product in independent databases like EWG’s Skin Deep.
Will organic eye makeup irritate sensitive eyes?
COSMOS-certified eye formulas are ophthalmologist-tested specifically because sensitive eyes are a concern. The absence of formaldehyde releasers and undisclosed fragrance allergens actually makes certified-organic eye makeup the lower-irritation choice for sensitive eyes, not the higher one.
Sources
- Whitehead et al., “PFAS in cosmetic products,” Environmental Science & Technology Letters, 2021 — doi.org/10.1021/acs.estlett.1c00240
- US CDC/ATSDR — PFAS health information — atsdr.cdc.gov
- North American Contact Dermatitis Group — eyelid allergens — contactderm.org
- COSMOS-Standard — cosmos-standard.org