You can choose between two sizes of oils to try. The 15ml bottles are labeled for topical or aromatic use and the vitality line (5ml bottles) are labeled for dietary use. The oils inside the bottles are the exact same oil, but FDA laws prohibit companies from labeling products for both topical and dietary use. It seems silly, but it's for your safety - for example, you don't want people eating their makeup. Young Living follows FDA guidlines for safe use.