Shampoo formula causes hair dryness?
Hey everybody,I am trying to formulate a shampoo for daily use as follow:20% Disodium laureth sulfosuccinate8% cocamidopropyl betaine2% cocamide DEA2% glycerine4% polyquaternium-7Many users told me that causes some dryness of hair. I do not know the reason. Could you help me?
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