I just bought this FBB at the Chemistry Store & wondered if anyone knows if this formula already has a preservative in it. These are the ingredients: INCI: Distilled Water, Glycerin, Sorbitol, Sodium Cocoyl Isethionate, Disodium Lauryl Sulfosuccinate, Sodium Chloride, Propylene Glycol, Phenoxyethanol, Methylparaben, Ethylparaben, Propylparaben, Butylparaben, Isobutylparaben, Tetrasodium EDTA. Any help would be appreciated. Thanks!