preservative for powder clay mask or scrub powder from herbs
If i make powder products such as clay mask and herbs with rice powder as the base for scrub. should i add preservatives? if yes what is the best preservative for this kind of product. can i use sodium benzoat only? or i should add another powder form of preservatives? if yes can you recommend me which one?
so far i got an information powder products dont need preservatives.
pls kindly help
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