Roz Salt Scalp Scrub vs Curly Hair Shampoo Base with Chia Extract: which is safer?
Roz Salt Scalp Scrub is our pick: better on PFAS and on the overall hazard picture.
Our pick
Credo Beauty
Roz Salt Scalp Scrub
PFAS grade
Excellent 100/100
Overall grade
Excellent 86/100
Verdict
Buy
Hazard flags
⚑ 2
Material
salt crystals, mineral-based scrub
Confidence
82%
PossibleFragrance allergens or undisclosed fragrance components
ReportedMechanical irritation from crystal size and shape
Function of Beauty
Curly Hair Shampoo Base with Chia Extract
PFAS grade
Excellent 75/100
Overall grade
Good 67/100
Verdict
Buy
Hazard flags
⚑ 2
Material
Aqueous shampoo base with botanical extract (chia)
Confidence
78%
PossibleFragrance allergens and sensitizers
Possible1,4-dioxane (processing contaminant)
Where these two actually differ
- We flag Fragrance allergens or undisclosed fragrance components and Mechanical irritation from crystal size and shape on the Credo Beauty and not on the Function of Beauty.
- We flag Fragrance allergens and sensitizers and 1,4-dioxane (processing contaminant) on the Function of Beauty and not on the Credo Beauty.
- The Credo Beauty is salt crystals, mineral-based scrub where the Function of Beauty is Aqueous shampoo base with botanical extract (chia), which is most of the difference in these two grades.
- The gap is 25 points, wide enough that this is not a close call, and the Credo Beauty is the one to buy.
Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
More shampoo: see the full ranking