Is Nigella sativa supplementation effective for asthma?

I read with interest carefully the article by He et al. [1] published in a recent issue of American Journal of Emergency Medicine. The topic of the meta-analysis is interesting and much work and effort was put in this study to evaluate the efficacy of Nigella sativa supplementation in asthmatic patients. While I generally agree with the conclusions of the study, I would like to express our concerns regarding some methodological issues.
Source: The American Journal of Emergency Medicine - Category: Emergency Medicine Authors: Source Type: research