Roz Salt Scalp Scrub vs Grow Strong Thickening 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
Garnier Fructis
Grow Strong Thickening Shampoo
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleFragrance allergens and skin sensitizers
Possible1,4-Dioxane (contamination in surfactant supply chain)
LikelyEye irritation (product misdirection)
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 Garnier Fructis.
- We flag Fragrance allergens and skin sensitizers, 1,4-Dioxane (contamination in surfactant supply chain) and Eye irritation (product misdirection) on the Garnier Fructis and not on the Credo Beauty.
- The Credo Beauty is salt crystals, mineral-based scrub where the Garnier Fructis is aqueous shampoo solution, 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