Comments: It's premature to make a prediction of a supplement preventing or inhibiting cancer based on a 52-day study on mice. There are so many complicating factors involved in cancer formation that even if a supplement helps in one particular area of the immune system, it may have detrimental effects on another aspect. However, ginseng has had much research devoted to it, and a long history of medicinal benefit. At this time, it seems that taking small amounts on a regular basis appears to be safe.