What effect will acupuncture have on natural killer cells?

Questionable. The answer is no one is really sure although there have been reports in some studies that there is a boost in white counts in those that are treated with accupuncture.
May stimulate them ? There is research that suggests that acupuncture may stimulate natural killer cells. http://www.foxvalleyacupuncture.com/index.php/acupuncture-stimulates-natural-killer-cells-attack-cancer & http://www.Ncbi.Nlm.Nih.Gov/pmc/articles/pmc3135660/.