Gastrodia elata (Tian Ma) is a traditional East Asian botanical. People take it for occasional dizziness, headaches, and mild nervous tension.
The typical preparation is a decoction made from the dried rhizome. A daily dose of 3 to 9 grams of dried rhizome is common. Liquid extracts and powders are also available, but dosing varies by form.
This herb can cause drowsiness. Use caution if you take sedatives or blood pressure medications. Its safety during pregnancy or breastfeeding has not been established.