Lewis CA, et al. - Considering the restrictive and/or malabsorptive nature of bariatric surgery that may enhance the risk for micronutrient deficiencies, researchers identify and critique the evidence for vitamin A, B1, C or E deficiencies associated with bariatric surgery. This systematic review included 21 articles. Once critiqued all studies were of level IV grade and neutral or negative in quality. The literature lacks the studies investigating the relevance of measuring micronutrient supplementation and inflammatory markers for validity of serum vitamins.