Vitamin D is one of environmental factors potentially modulating brain development and functioning. Vitamin D3 deﬁciency during pregnancy and early childhood is suggested to be one of several risk factors for development of ASD in genetically predisposed individuals (Cies´lin´ska et al., 2017). Many studies e.g (Eyles et al., 2013; Grant and Sole, 2009; Noriega and Savelkoul, 2014) suggested that vitamin D has an important role as a neuroactive steroid, which can affect neuronal differentiation, axonal connectivity and brain structure and function. Vitamin D has been increasingly recognized for its immunomodulatory role and has been implicated in the pathogenesis of autoimmune disorders. Also it has numerous and dynamic effects on the immune system, ranging from altering T cell responses and regulating cytokine pathways (Kocˇovská et al., 2017). So from this point of view, this study will be conducted to show adjuvant effect of vitamin D supplementation on ASD children at clinical level and inflammatory marker (IL4).
The aim of this work is to study the adjuvant effect of vitamin D supplementation on inflammatory marker (IL4) and habilitation outcome in children with Autism Spectrum Disorder in order to evaluate its efficiency as a treatment option based on correction of immune dysfunction.