The present study encompasses in vitro immunomodulatory activity of Withania somnifera WS (Solanaceae) examined on human neutrophils. The isolated compound of Withania somnifera roots was screened for its possible immunomodulatory activity by nitro blue tetrazolium test, phagocytosis of killed Candida albicans, neutrophil locomotion and chemotaxis. The extracted compound was examined at concentrations, viz. 10 μg/ml, 20 μg/ml, 40 μg/ml, 100 μg/ml and 1000 μg/ml. The activity expressed by the compound on human neutrophils was found to be significant for examined parameters.
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