Ginseng is any one of 11 perennial plants with fleshy roots belonging to the genus Panax. While there are different kinds of ginseng, the two that you should use –also the ones that have had the most controlled double-blind studies done on them-are American ginseng (Panax quinquefolius) and Asian or Korean ginseng (Panax ginseng.) While widely known as a stimulant to speed up a sluggish metabolism, that description doesn’t do it justice. Ginseng’s greatest quality is that it can help fight fatigue and boost energy as well as mental alertness (in a randomized double-blind study in 2010 290 cancer patients at the Mayo Clinic were given ginseng daily and it was found to fight even the crippling fatigue caused by chemotherapy.) This is huge when it comes to weight loss-without energy, it’s hard to exercise. Without exercise, it’s near impossible to lose weight-at least in a healthy way. In addition to boosting energy, there is tentative evidence that it can help manage blood sugar, which also affects energy levels as well as appetite.