Seaweed Shampoo vs Roz Salt Scalp Scrub: which is safer?
Roz Salt Scalp Scrub is our pick: better on PFAS and on the overall hazard picture.
Bumble and bumble
Seaweed Shampoo
PFAS grade
Excellent 75/100
Overall grade
Good 67/100
Verdict
Buy
Hazard flags
⚑ 2
Material
Water-based shampoo with seaweed extract
Confidence
78%
PossibleFragrance allergens (undisclosed components)
PossibleHeavy metals in seaweed extract
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
Where these two actually differ
- We flag Fragrance allergens (undisclosed components) and Heavy metals in seaweed extract on the Bumble and bumble and not on the Credo Beauty.
- We flag Fragrance allergens or undisclosed fragrance components and Mechanical irritation from crystal size and shape on the Credo Beauty and not on the Bumble and bumble.
- The Bumble and bumble is Water-based shampoo with seaweed extract where the Credo Beauty is salt crystals, mineral-based scrub, 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