Stephenson Shampoo Bar Preservative?

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KudzuGoddess

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All, please help me with the Stephenson Shampoo bar. What preservative do they use and do I need to add more if I add stuff? I get that their product is trademarked so they don't want to disclose everything but there has to be a preservative, right? Water is one of the few ingredients that they do list. Water=Life. What am I missing here? I am very new at this so please excuse my ignorance if this is a dumb question. Thank you all, you're the best!
 
here is one of the ingredients, and the description provided by google
Propylene glycol is used as a softening agent, preservative, humectants, and solvent
in cosmetics, fragrances, topical medications, soaps and cleansers, hair care products, and deodorants
 
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