Function of Beauty · Shampoo
Function of Beauty Custom Shampoo
Lower PFAS concern for a rinse-off liquid shampoo; no flag signals detected.
Function of Beauty's custom shampoo is a water-based liquid cosmetic with no disclosed water-repellent, stain-resistant, or Teflon-family coating treatments typical of PFAS use. The brand makes no public PFAS claims either way.
Shop Function of Beauty on Amazon →Material
water-based liquid shampoo, proprietary formulation
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
Function of Beauty Custom Shampoo is a water-based liquid formulation marketed with personalized ingredient selection. The brand does not publicly disclose full ingredient transparency beyond marketing claims, making independent hazard assessment difficult. As a rinse-off product (unlike leave-on cosmetics), exposure duration and absorption are inherently lower. Proprietary blends mean you cannot verify presence or absence of specific chemical additives without requesting a full Safety Data Sheet.
The brand's record and disclosure
Function of Beauty has not published comprehensive ingredient lists or third-party certifications (e.g., EWG Verified, Leaping Bunny) on their shampoo line. The brand markets customization and natural-sounding language but remains silent on PFAS use, formaldehyde releasers, or preservative choice. No major product recalls or published safety incidents have been documented for this shampoo. Limited disclosure makes it harder to assess compliance with cosmetic safety standards than brands with full transparency.
How it compares in its category
Typical shampoos contain preservatives (methylisothiazolinone, phenoxyethanol) and fragrance compounds; Function of Beauty's proprietary formula obscures whether these are used. Customization marketing is a consumer differentiator but does not inherently improve safety profile compared to mainstream shampoos. Brands like Vanicream and Cetaphil publish full ingredient disclosure and third-party vetting; Function of Beauty does not. Price point and personalization appeal are higher than mass-market shampoos but transparency is not.
If you buy it
Rinse-off shampoos present minimal dermal absorption risk compared to leave-on products. If you have sensitive scalp, fragrance sensitivity, or contact dermatitis history, request the full ingredient list before purchase to verify preservative and fragrance chemicals. Store in a cool, dry place away from direct sunlight to preserve formula stability. Discontinue use immediately if scalp irritation, itching, or allergic reaction occurs and patch-test on a small scalp area first if concerned.
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 and undisclosed fragrance chemicals
Shampoos commonly contain fragrance mixes; Function of Beauty does not publicly itemize fragrance components, meaning potential allergens like limonene, linalool, or oakmoss are not pre-screened. Customization does not guarantee fragrance transparency.
Formaldehyde-releasing preservatives
No public evidence that Function of Beauty uses formaldehyde releasers (DMDM hydantoin, imidazolidinyl urea), but proprietary formula opacity means this cannot be ruled out without ingredient disclosure.
1,4-dioxane contamination in surfactants
Shampoos using ethoxylated surfactants (common in rinse-off formulas) may contain trace 1,4-dioxane as a manufacturing byproduct. Function of Beauty does not disclose surfactant type or whether vacuum distillation (removal step) was used.
Heavy metals in colorants or pigments
Colored shampoos can contain iron oxides or synthetic pigments with trace metals; no recalls or warnings on record for Function of Beauty products, and liquid shampoos present lower risk than solid cosmetics.
Preservative-induced contact dermatitis
Commonly used preservatives in shampoos (methylchloroisothiazolinone, phenoxyethanol) trigger contact dermatitis in sensitive individuals. Customization marketing does not guarantee hypoallergenic or preservative-free formulation without explicit labeling.
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 Shampoo
Credo Beauty
Roz Salt Scalp Scrub
salt crystals, mineral-based scrub
Lower-concern buy, salt scrub formulation carries minimal inherent PFAS risk.
✓Verified PFAS-free by a third party
Puracy
Public Goods Shampoo Refill
aqueous surfactant-based liquid shampoo
Lower-concern shampoo refill; Puracy's MADE SAFE cert and no-PFAS positioning align, but cosmetic formulation labs are rarely published.
✓Verified PFAS-free by a third party
Puracy
Natural Baby Shampoo Body Wash
water-based surfactants, plant-derived ingredients, aqueous solution
Lower PFAS concern, liquid cosmetic with no water-resistant or nonstick triggers.
⚠Risky category by default
More shampoo 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.