Roz Salt Scalp Scrub vs Hair One Signature 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
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
Kristin Ess
Hair One Signature Shampoo
PFAS grade
Excellent 75/100
Overall grade
Good 67/100
Verdict
Buy
Hazard flags
⚑ 2
Material
aqueous shampoo base (water, surfactants, conditioning agents)
Confidence
82%
PossibleFragrance allergens (undisclosed component list)
Possible1,4-dioxane (manufacturing 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 Kristin Ess.
- We flag Fragrance allergens (undisclosed component list) and 1,4-dioxane (manufacturing contaminant) 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 (water, 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