Health and therapeutic benefits of Shatkarma: A narrative review of scientific studies.

Shatkarma, also known as Shatkriya are a set of six yogic cleansing techniques described in the Hatha Yoga texts. Several health benefits of these procedures are indicated in the traditional texts of Yoga. However, there is no comprehensive literature about the scientific evidence on Shatkriya. Hence, we searched in PubMed, PubMed Central and Google Scholar databases to review relevant articles in English. The search yielded a total 723 references, published from 1976 to April 2020. Based on the inclusion and exclusion criteria, 37 articles were included in this review. We found scientific studies on four out of six cleansing techniques. The limited evidence on Shatkriya suggests positive effects on various physiological and clinical domains. The practice of dhauti was found to enhance respiratory functions and was useful in digestive disorders. Nasal cleansing, neti was particularly found beneficial in managing the rhinosinusitis in age groups ranging from children to adults. Although trataka practice was found to enhance cognition and bring a state of relaxation, but there was no evidence supporting its role in eye disorders. Kapalabhati practice appears to have a beneficial role in the activation of sympathetic nervous system, enhance cognition, and improve overall metabolism. Further large-scale clinical trials with robust designs are warranted to evaluate the effects of Shatkriya in health and disease.