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"RH 90" is not a recognized INCI name for a cosmetic ingredient. It might refer to a specific grade of a chemical or a product code, but it's not a standard INCI designation.
No specific concern data available
Safety summary
Cannot assess safety as it is not a recognized cosmetic ingredient.
For informational purposes only. This is not medical advice. Always patch test new products and consult a dermatologist for skin concerns.