compliment to Aspen Bark Extract

We're trying to create a essence spray with as broad a antibacterial spectrum as possible. We are currently using 2% Aspen Bark Extract, and wondering what else could we use that will compliment it.

We tried Potassium Sorbate but it discolors over a two week period. We lean more on the nontoxic side of the fence.

Thanks!
Todd
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