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Dietary Supplementation with an Extract of North American Ginseng in Adult and Juvenile Mice Increases Natural Killer Cells

Cells belonging to the innate immune system are referred to as natural killer (NK) cells. We recently demonstrated that normal, pre-weaned infant mice, injected with a proprietary extract of ginseng (CVT-E002) had augmented NK cell numbers vs. sham-injected mice. In the present study, we extended these observations into juvenile and adult mice. Thus, young adult (age: 8–9 wk) C3H mice were given daily dietary CVT-E002 for 4 wk followed by untreated chow for the following 2 months, then euthanized (age: 20–21 wk). Other C3H mice (juvenile: 4-wk-old) were given CVT-E002 under the same protocol and sampled at 18 wk of age. In spite of withdrawing the extract 2 months earlier, the absolute numbers of NK cells in the young adults, remained significantly (p < 0.01), and slightly, elevated in the spleen and bone marrow (BM), respectively. The relative numbers (%) of NK cells in the blood also remained elevated (p < 0.05). In juvenile mice fed CVT-E002, the absolute numbers (spleen, BM) and % (blood) of NK cells were all elevated (p<0.01 – p<0.05). The mechanisms responsible for these super-normal numbers of NK cells long after withdrawal of CVT-E002, is as yet unknown.