Roz Salt Scalp Scrub vs Hair Strengthening Shampoo: 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
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleFragrance allergens or undisclosed fragrance components
ReportedMechanical irritation from crystal size and shape
Kristin Ess
Hair Strengthening Shampoo
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleFragrance allergens and sensitization
PossiblePreservative-related irritation
PossibleScalp irritation from conditioning agents or silicones
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 Kristin Ess.
- We flag Fragrance allergens and sensitization, Preservative-related irritation and Scalp irritation from conditioning agents or silicones on the Kristin Ess and not on the Credo Beauty.
- The Credo Beauty is salt crystals, mineral-based scrub where the Kristin Ess is aqueous shampoo base, surfactants, conditioning agents, 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