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    How do Dr Bronner's & Vermont Soap preserve their liquid castile soaps?

    Hi, I've been reading up quite a bit about the difference between antioxidants and preservatives, and why a good broad-spectrum preservative is necessary to prevent microbial activity in liquid castile soap. However, I see brands such as Dr. Bronner's and Vermon Soap (they have a 3 year shelf...
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