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When purchasing essential oils to make your bath oil, aromatherapy experts like those at Aroma Web recommend researching the side effects of strong essential oils before you do. Many of these potent combinations can have negative effects, so check with your physician if you are pregnant or have a heart condition, cancer, or liver and kidney problems.

Making bath oils requires a few drops of scented essential oil diluted in what aromatherapists call a "carrier oil," like sweet almond oil or another vegetable-based oil. Carrier oils bring out the optimum scent of the essential oil. For the best, longest-lasting results, make sure you store your bath oils in airtight bottles so they are less likely to oxidize and ruin. Each of these bath oils have different effects on your body and mind when using them, so be sure to read the descriptions of the oils used to determine if you want to wake up, relax, or stimulate your mind.