Leonor Greyl Paris Bain Traitant a la Propolis Gentle Dandruff Shampoo in Beauty: NA. Leonor Greyl Paris Bain Traitant a la Propolis Gentle Dandruff Shampoo in Beauty: NA. Leonor Greyl Bain Traitant a la Propolis was the market's first anti-dandruff shampoo gentle enough for everyday use. This super effective, non-aggressive formula features antibacterial propolis to address dandruff and scalp sensitivity, delivering instant results.. Bee propolis has gentle antiseptic properties to help prevent further irritation. Cruelty-free and color-safe. Free of parabens, silicones, coal tar, and SLS. 7 fl oz. Use with Huile Apaisante for best results. LEGL-WU5. 2033. A unique philosophy behind a visionary hair care line, Leonor Greyl Paris offers a vast range of hair care products that bring out hair's full beauty. What makes the brand special is its unique approach - a blend of daring formulations and creativity with a fundamental commitment to only offer natural products of which the active ingredients are exclusively taken from the world's incredible pharmacopoeia of plants, flowers and fruits. Their objective is to produce products with effectiveness and effortlessness, adapting to all hair types and hairstyles.