“…There have been many studies exploring the potential associations between vitamin D and psychological phenomena or psychiatric disorders, including depression (Alavi, Khademalhoseini, Vakili, & Assarian, 2018; Amini, Jafarirad, & Amani, 2018; Bertone‐Johnson et al, 2012; Dumville et al, 2006; Ghaderi et al, 2017; Jorde, Sneve, Figenschau, Svartberg, & Waterloo, 2008; Khoraminya, Tehrani‐Doost, Jazayeri, Hosseini, & Djazayery, 2013; Pittampalli et al, 2018), anxiety (Armstrong et al, 2007; Huang et al, 2014; Pu et al, 2018), psychotic disorders (Chiang, Natarajan, & Fan, 2016), cognitive impairment (Degner, 2016; Etgen, Sander, Bickel, Sander, & Forstl, 2012), sleep disturbance (Gao et al, 2018; Ghaderi et al, 2017), autism spectrum disorder (Moradi et al, 2018; Patrick & Ames, 2014), and substance use (Ghaderi et al, 2017). Studies investigating the relationship between vitamin D and depression are the most common.…”