Generally, psoriasis and seborrhoeic dermatitis scalps should avoid the same ingredients as a dandruff scalp: - Fatty Acids and Oils (the safe options would be MCT Oil, Squalane and Mineral Oil) - Esters - Polysorbates - Cholesterol - Fatty Alcohols - Yeast Ferments - Squalene (different from Squalane) - Ceramides - Glycerin - Sugars - Neem Oil