Olive Young best seller#2 on Olive Young
Levero Coloring Shampoo — Black
Our read
Why our pick wins
Same oxidative core as GDS Black — PPD, resorcinol, m-aminophenol and a hydrogen peroxide developer — so the allergen story is identical and the 48-hour patch test applies to both. Where Levero loses ground is the supporting cast: lauramide DEA, ethoxydiglycol, TEA lauryl sulfate, ceteareth-20 and three declared fragrance allergens, which is why it screens below ours. Both give permanent coverage; neither is PPD-free.
Screening score
How they compare
Levero Coloring Shampoo — Black
7.7 / 10
GDS Hair Dye Shampoo — Grey Coverage in 10 Minutes in the Shower 250ml / 190mlDHALIORA pick
8.6 / 10
See the DHALIORA pick
GDS Hair Dye Shampoo — Grey Coverage in 10 Minutes in the Shower 250ml / 190mlScreening score 8.6 / 10
What's inside
Ingredient breakdown
33 ingredients screened
Solvent
Low
Surfactant
Low
Co-Surfactant
Low
Foam booster / thickener
Mid
Alkalizer (ammonia substitute)
Mid
Opacifier
Low
Humectant
Low
Humectant
Low
Oxidative dye — common allergen
High
Solvent / penetration enhancer
Mid
Dye coupler — common allergen
High
Preservative
Low
Conditioning
Low
Dye coupler
High
Antioxidant / preservative
Mid
Silicone
Low
Humectant
Low
Dye intermediate
High
Chelator
Low
Conditioning
Low
Preservative
Low
Soothing
Low
Fragrance Allergen
Mid
Fragrance Allergen
Mid
Fragrance Allergen
Mid
Preservative
Mid
Oxidizing developer
Mid
Emollient
Low
Surfactant
Mid
emulsifier
Mid
Emulsifier
Mid
Thickener
Low
pH Adjuster
Low
About this comparison — This is an editorial, factual comparison. Ingredient risk reflects our own reading of publicly available safety data, an EWG-style reading. DHALIORA is not affiliated with, endorsed by, or partnered with the competitor brand. Nothing here is medical advice — always read the packaging and patch-test where indicated.