Roz Salt Scalp Scrub vs Acidic Bonding Concentrate Shampoo & Conditioner Set - 1 l / 33.8 fl oz: 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
Redken
Acidic Bonding Concentrate Shampoo & Conditioner Set - 1 l / 33.8 fl oz
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
Possible1,4-dioxane (synthesis byproduct in ethoxylated ingredients)
PossibleFragrance allergens and undisclosed fragrance components
PossibleFormaldehyde releasers (preservative system)
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 Redken.
- We flag 1,4-dioxane (synthesis byproduct in ethoxylated ingredients), Fragrance allergens and undisclosed fragrance components, Formaldehyde releasers (preservative system) and Scalp irritation from alkaline buildup if rinsed inadequately on the Redken and not on the Credo Beauty.
- The Credo Beauty is salt crystals, mineral-based scrub where the Redken is aqueous shampoo and conditioner formulations, 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