Does soap contain lye?

Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
Most products marketed as soaps today contain synthetic detergent cleansers. In the past, soap was often made from fats and an alkali (a salt derived from wood ash) such as lye. According to the Food and Drug Administration, a cleanser made with synthetic detergent is not a true soap. On the other hand, detergent-based body cleansers produce lots of suds and lather, making them effective for washing your skin. If you want to know the ingredients in any soap product, read the label. It should list all active ingredients.

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