Natural preservatives for plant powders?!


Question: Natural preservatives for plant powders.?
I'm making plant powders for cosmetic use and do not want to use chemical stuff like paraben. Sugar is not suitable for skin. Salt attracts water (moister is also a problem). Any idea.?
Thanks

additional info:
We are a small home industry and cannot afford expensive productsHealth Question & Answer


Answers:
Vitamin C powder like calcium ascorbate might help with preventing oxidation. also Rosemary oleoresin powder (ROE) and dry vitamin E powder. What about Benzoin.? It's a little bit astringent but also anti-inflammatory and healing.

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