Early research suggests that some adaptogenic herbs, including R. rosea, ginseng, and ashwagandha, may help boost serotonin and improve mood. These herbs and plant extracts are often used in Ayurveda (a form of alternative medicine that is the traditional medicine of India) and traditional Chinese medicine. While adaptogens show promise for improving serotonin, it’s best to talk to your healthcare provider before trying them to make sure they are safe for you.