1. Alcohol- The bad ones are SD alcohol, SD alcohol 40, Alcohol denat, Propanol, Propyl alcohol and Isopropyl alcohol. All of these can be very drying to hair and can cause breakage.
The Good: Fatty Alcohols (The good ones are Lauryl alcohol, Cetyl alcohol, Myristyl alcohol, Stearyl alcohol, Cetearyl alcohol and Behenyl alcohol [docosanol].) Normally found in conditioners and tend to help with moisturizing and detangling.
2. Mineral Oil/Petroleum
Coats your hair instead of penetrating the shaft so it offers no moisturizing benefits. What this does is actually dry out the hair because no moisture (water and other moisturizing oils) cannot get through the mineral oil barrier. Mineral oil will cause build up, but the real problem is simply that it is drying. Many products have mineral oil because it is cheap.
3. Sodium Lauryl Sulfate
A cheap, foaming and thickening agent that strips our hair of moisture and causes skin and scalp irritation. 95% of all hair shampoos contain this ingredient or one of its derivatives.
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