Last updated September 17, 2026 What Is Kanna? Effects, Uses, and What the Research Says Kanna is a South African succulent commonly known as Sceletium tortuosum. It has a history of use among San and Khoikhoi peoples and contains alkaloids studied for their effects on mood and stress responses. The background to a human brain-imaging study describes that botanical and traditional context. Today, kanna supplements are marketed… Read more

Last updated September 12, 2026 Smoking Herbs With Weed: Reported Effects, Evidence, and Risks Smoking herbs with weed can change a joint’s aroma and flavor, but research does not provide a reliable way to choose an herb that makes the high calmer, clearer, or more euphoric. Lavender, rose petals, chamomile, mullein, damiana, and peppermint appear in herbal smoking blends, yet the evidence discussed below largely concerns other p… Read more

Last updated September 10, 2026 Botanical and Herbal Supplements: Uses, Effects, and Safety Herbal supplements contain plants, plant parts, or extracts that people take for purposes such as stress, sleep, digestion, and general wellness. Some preparations have evidence supporting specific uses. Others remain poorly studied, and products made from the same herb can differ substantially. The National Center for Complementary and Int… Read more