Crystal Deodorant Stick
Lower concern; mineral-salt deodorant with no known PFAS triggers.
Crystal Deodorant Stick uses mineral-salt formulation without waterproofing or nonstick coatings that would harbor PFAS. The brand claims PFAS-free status, though no third-party testing is publicly documented.
Brand says: “Crystal products are PFAS-free and do not contain synthetic fragrances, parabens, or aluminum compounds.”
We flunk more products than we pass. This one earned its grade. How we grade
Material
mineral salts (potassium alum complex), water-based
Brand disclosure
Brand claims PFAS-free
Lab data
No public lab test
What’s concerning
Category baseline
cosmetics is a category where PFAS exposure is more common.
Heavy metals
Potassium alum is mined and processed; while regulatory food-grade alum is tightly controlled, independent third-party testing of specific Crystal batches for aluminum bioavailability or contaminant metals is not publicly available. Absorption through intact skin is minimal, but sensitive or compromised skin warrants caution.
Source: FDA ↗Skin sensitization or irritation
Isolated reports of irritation in consumers with damaged skin barrier or severe aluminum sensitivity exist, though rates appear low. Salt-based formulations can irritate freshly shaved underarms in susceptible individuals.
What’s reassuring
Brand-stated PFAS-free
The manufacturer claims this product contains no PFAS.
Safe base material
Made from ceramic, mineral, or natural fiber with no PFAS risk.
Fragrance allergens
Crystal markets an unscented formulation (original mineral salt only) with no added fragrance compounds, eliminating this common sensitizer category entirely for the standard product.
Formaldehyde / VOCs
Water-based mineral salt formulation with no documented use of formaldehyde releasers; simple inorganic chemistry reduces preservative complexity typical of synthetic deodorants.
Source: ATSDR ↗Microbial contamination
Water-based mineral salt formulation is inherently antimicrobial; no documented cases of bacterial or fungal contamination in unopened or properly stored Crystal Deodorant products.
The full breakdown
What it's made of and why it matters
Crystal Deodorant is formulated primarily from potassium alum (potassium aluminum sulfate), a naturally occurring mineral salt dissolved in water. Potassium alum has been used in personal care for decades and works by creating an inhospitable environment for odor-causing bacteria rather than blocking sweat. This water-based, salt-only approach eliminates the chemical complexity of synthetic deodorants and antiperspirants, removing common triggers for dermatological concerns.
The brand's record and disclosure
Crystal explicitly markets itself as PFAS-free and has maintained this positioning consistently across product lines. The brand provides straightforward ingredient disclosure on packaging. No major recalls or safety controversies have been documented for Crystal Deodorant in public databases. The company's transparency about avoiding synthetic antimicrobials and fragrance chemicals aligns with its mineral-salt positioning, though independent third-party testing of batches is not publicly available.
How it compares in its category
Mineral-salt deodorants like Crystal occupy a lower-complexity tier compared to aluminum-based antiperspirants (which raise systemic absorption concerns) and fragrance-heavy synthetic deodorants (which carry allergen and preservative risks). This product sits in the minimal-ingredient space favored by consumers seeking fragrance sensitivity avoidance. The trade-off is that mineral salts are deodorants, not antiperspirants, so they address odor but not sweat suppression.
If you buy it
Apply to clean, dry skin; applying to moist skin reduces effectiveness and can leave residue marks. The stick may leave white salt deposits on skin or clothing, which can be rinsed off. No special storage precautions are needed, but keep away from extreme heat (crystal structure can degrade above 130F prolonged exposure). Replace when noticeably worn down or if you observe crumbling at the base; mineral deodorants typically last 6-12 months with normal use.
What we don’t know
- Basis
- Model estimate, 78% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Crystal has made a specific claim
Formulations change between production runs, so check the current label. How we grade.
More deodorant 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.