Roz Salt Scalp Scrub vs Grow Strong 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
Garnier Fructis
Grow Strong Shampoo
PFAS grade
Excellent 75/100
Overall grade
Good 59/100
Verdict
Buy
Hazard flags
⚑ 4
Material
Water-based shampoo formulation
Confidence
72%
PossibleFormaldehyde releasers (preservative system)
Possible1,4-dioxane (manufacturing byproduct)
PossibleFragrance allergens
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 Formaldehyde releasers (preservative system), 1,4-dioxane (manufacturing byproduct), Fragrance allergens and Scalp or eye irritation from surfactants on the Garnier Fructis and not on the Credo Beauty.
- The Credo Beauty is salt crystals, mineral-based scrub where the Garnier Fructis is Water-based shampoo formulation, 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