A tip I learned in school when making these kind of natural skin care products is to add a couple of drops of grapefruit seed extract concentrate (I think that is the name, it comes in a little flat bottle) to your mixture and that will preserve it longer and is still natural :)
Tea tree oil will work as well! But the gel really doesn't have much for mold to grow on its own - that is more the factor of where you store it and any additional water getting into the container.
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