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[A] The following conclusions are supported by good evidence:
There is conclusive evidence that probiotics modulate the intestinal and systemic immune systems.
[B] The following conclusions are supported by fair evidence:
A meta-analysis of RCTs did not show that the use of North American ginseng extracts reduces the incidence or the severity of colds. However, two RCTs from the same meta-analysis found that ginseng (200 mg of ginseng taken twice daily for four months) shortened the