Objective The aim of this study was to summarise the results from existing studies reporting on the effectiveness of the introduction of violence and injury observatories (VIOs). Design This is a systematic review and meta-analysis study. Data sources We searched multiple electronic databases including but not limited to PubMed. PsycINFO. https://parisnaturalfoodes.shop/product-category/vitd3-400-iu-liquld/