Which Essential Oils Actually Work?

Whether it's lavender aromatherapy to sleep better or a peppermint oil pill for your irritable bowel syndrome, essential oils have a lot of proposed therapeutic uses. Here's where the research stands on those and others like bergamot oil for pain, tea tree oil for acne, and rosemary oil for memory.

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Correction: This is a picture of a kaffir lime, not bergamot! Bergamot is smoother with a yellow-orange peel.