American Ginseng

American ginseng is a root from a North American plant whose active compounds, called ginsenosides, are thought to influence immune activity and how the body handles stress and sugar. People most often look at it for colds, and the evidence is moderate: studies of a standardized extract found colds were less common and symptoms didn't last as long. Those results came from a few hundred people and mostly one branded extract, while findings for blood sugar and working memory were smaller and more limited.