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Thanks, artemis and Saponista! I found this link where Vermont soap claims that its rosemary extract acts as the preservative: "Rosemary extract is our anti-oxidant natural preservative". https://vermontsoap.com/rosemary-essential-oil-products/ I think it's probably down to the high pH of the...

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...