At Lotioncrafters they have some natural preservatives, NataPres, and Leucidal (water soluble); and PhytoCide Elderberry OS (oil soluble). The Elderberry looks very efficacious but says it is for "anhydrous (without water?) or oil containing solutions" so does oil containing mean it would be effective to use it in a solution that has both water and oil if mixed in the oil phase?
Or could I need to mix the water phase ingredients and add a water soluble natural preservative to it?... and then mix the oil phase ingredients and add the oil soluble Elderberry preservative to that? Then emulsify the two together?
Or is it only possible to use for anyhydrous or oil solutions?
Thanks for any input and suggestions. Just getting started with the DIY crafting. Would like to use natural preservatives of course when possible.