Olaplex · Hair Styling Products
Olaplex No.9 Bond Protector Nourishing Hair Serum
Lower concern; hair serum with no known PFAS triggers, but Olaplex hasn't publicly disclosed PFAS status.
Olaplex No.9 is a leave-in hair serum with silicone and conditioning agents typical of luxury hair care, materials not inherently associated with PFAS. No waterproofing, grease resistance, or nonstick coatings are implied. Olaplex has not published PFAS-free claims or third-party verification; the brand's silence on PFAS is the main gap.
Shop Olaplex on Amazon →Material
Silicone, conditioning oils, humectants (typical hair serum base)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
cosmetics 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
Olaplex No.9 is a silicone-dominant leave-in hair serum formulated with conditioning oils and humectants to reduce frizz and protect hair during styling. Silicones (likely dimethicone or cyclomethicone) are large, inert polymers that do not penetrate the scalp or skin meaningfully and are not absorbed systemically. The conditioning oils (typically plant or mineral oils) and humectants (glycerin, panthenol) are common cosmetic staples with established safe use histories. This product is designed for external hair application only, which limits exposure pathways.
The brand's record and disclosure
Olaplex is known for molecular bond-repair technology marketing but has not published comprehensive ingredient safety disclosures or third-party certifications (e.g., EWG Verified, Leaping Bunny). The brand does not publicly disclose PFAS testing or absence claims, though hair serums are not flagged category-wide for PFAS risk. No major safety recalls or substantiated adverse-event clusters are on record for Olaplex hair products. The company's silence on ingredient transparency is typical for mainstream beauty brands but limits independent verification.
How it compares in its category
Hair serums in this price and positioning tier typically use silicone bases; Olaplex No.9 is formulaically unremarkable and carries comparable safety profiles to Moroccanoil, Argan Magique, or drugstore silicone serums. Silicone-based products are generally considered lower-risk than oil-only or polymer-blend formulas that may contain undisclosed fragrance allergens or unstable emulsifiers. The main differentiation is marketing (bond repair) rather than material safety; the actual hazard landscape is routine for the category.
If you buy it
Apply to damp or dry hair strands only, not the scalp, to avoid buildup or irritation; use a dime-sized amount to avoid greasiness. Do not use on hair before high-heat styling (above 350F) without testing on a test strand first, as silicones can occasionally trap heat on delicate hair. Wash out thoroughly with shampoo every 2-3 days to prevent silicone layering, which can lead to dullness and product stacking. Discontinue use if scalp irritation or contact dermatitis develops; if ingested (e.g., by children), contact Poison Control, though silicones are minimally toxic.
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.”
Fragrance allergens (undisclosed composition)
Hair serums typically include fragrance blends not fully itemized on the label. Olaplex No.9 ingredient list does not break down fragrance components, so individuals with fragrance sensitivity or contact dermatitis risk cannot identify specific allergens in advance.
Silicone buildup and scalp occlusion
Leave-in silicone serums can accumulate on the scalp and hair over repeated applications, potentially causing product buildup, reduced shine, or temporary flaking if not washed out regularly. This is cosmetic rather than toxic but represents the main user-reported concern for silicone serums.
Contact dermatitis from conditioning oils or emulsifiers
The oils and emulsifiers in this serum are generally well-tolerated but can trigger localized irritation or allergic contact dermatitis in sensitive individuals, particularly if applied to or near the scalp. Pre-testing on a small patch is prudent for those with reactive skin.
Eye irritation if contact occurs
Silicone serums can cause mild stinging or temporary redness if they contact the eyes directly. The product should be kept away from the eyes and used only on hair; accidental eye contact warrants rinsing with water.
Heavy metals in pigments or colorants (if any)
Olaplex No.9 is a clear or translucent serum with no pigments or colorants listed, so the risk of heavy metal contamination from dyes is not applicable to this product.
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 Hair Styling Products
Olaplex
Signature Hair & Body Mist
water-based fragrance spray in glass/plastic bottle
Lower concern, but Olaplex makes no public PFAS commitment, typical for the cosmetics category.
✓Bare metal or glass, no coating at all
More hair styling products 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.