A traditional root used for stamina and vitality, with a substantial research base.
Panax Ginseng has one of the longer traditional-use histories among the ingredients here, and a correspondingly larger modern research base looking at fatigue, stamina, and general vitality.
Results vary by study and by the specific ginseng extract and dose used, which is typical for botanical research generally.
It's a reasonable, well-studied inclusion for a formula positioned around stamina and performance.