I live in Mexico and I haven't been able to find Ecocert approved preservatives other than phenoxyethanol which I don't want to use. I read that is possible to use potassium sorbate with sodium benzoate as preservative. So I was wondering if these together can make a good broad-spectrum preservative. I haven't been able to find a reliable source indicating the percentage needed for preserving the products.
Right now I am making very simple lotions with few ingredients like this:
How can I calculate the percentage needed of potassium sorbate and sodium benzoate? Also, I am really afraid of bacteria and mold so, is it possible to test it in small incubators such as the one sold in LotionCrafter?
If you know another one that I can get please advise. I cannot afford right now to take a course so any advice will be greatly appreciated!