Reishi (Ganoderma lucidum) is a woody fungus with a long history of use as an adaptogen. The powdered form comes from dried fruiting bodies or mycelium. You can stir it into coffee, tea, smoothies, or warm milk, which makes it easy to fit into a daily ritual.
Many people take reishi powder to help the body handle everyday stress and to support immune function. A mild calming effect often shows up in the evening, so it is typically used before bed to encourage deeper, more restful sleep.
A common serving is taken once or twice a day, mixed into hot water or a plant-based drink. Powder is less concentrated than extracts, so you might need a larger amount to feel an effect. Stick with the dose on the label unless a practitioner tells you otherwise.
If you take blood thinners like warfarin or have surgery scheduled, hold off. Reishi can slow clotting. It may also lower blood pressure and shift immune activity. Skip it if you have an autoimmune condition, and check with a professional before using it while pregnant or breastfeeding. Large amounts sometimes upset the stomach.