Apple Cider Vinegar Shampoo vs Thick Hair Shampoo: which is safer?
OUAI Thick Hair Shampoo is our pick, better on PFAS and on the overall hazard picture.
Aveeno
Apple Cider Vinegar Shampoo
PFAS grade
Excellent 75/100
Overall grade
Good 63/100
Verdict
Buy
Hazard flags
⚑ 3
Material
aqueous liquid shampoo (typical surfactants, conditioning agents, water)
Confidence
82%
PossibleSurfactant irritation (skin/eye contact)
PossibleFragrance allergens
PossibleMicrobial contamination (post-purchase)
Our pick
Ouai
Thick Hair Shampoo
PFAS grade
Excellent 75/100
Overall grade
Good 67/100
Verdict
Buy
Hazard flags
⚑ 2
Material
aqueous shampoo concentrate (likely surfactants, water, glycerin)
Confidence
72%
PossibleFragrance allergens
PossibleScalp irritation from surfactant concentration or pH imbalance
Where these two actually differ
- We flag Surfactant irritation (skin/eye contact) and Microbial contamination (post-purchase) on the Aveeno and not on the Ouai.
- We flag Scalp irritation from surfactant concentration or pH imbalance on the Ouai and not on the Aveeno.
- Both carry a flag for Fragrance allergens, so neither choice avoids it.
- The Aveeno is aqueous liquid shampoo (typical surfactants, conditioning agents, water) where the Ouai is aqueous shampoo concentrate (likely surfactants, water, glycerin), which is most of the difference in these two grades.
- These two are level, close enough that price and fit should decide it rather than our grade.
Both products run through the same public rubric, which covers 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 →
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