Kava kava (Piper methysticum) is a plant from the pepper family. Kava helps calm the nerves and stimulate memory It is considered a natural alternative for treating insomnia, because it contains kavalactones, a substance usually used in the manufacture of anti-anxiety and stress medications. It works similar to alcohol on your brain, making you feel calm, relaxed and happy. It also helps relieve pain, prevent heart attacks, and relaxes muscles.