“…Additionally, VD 3 is synthesized in the skin as the biologically active VD form by exposure to the ultraviolet radiation from the sun (Gallagher et al., 2019). The marker for VD status is circulating 25(OH)D in the blood which is correlated with disease prevention and regulation of physiological functions (Abdel‐Rehim, El‐Tahan, El‐Tarawy, Shehata, & Kamel, 2019; Di Somma et al., 2017; Goncalves et al., 2014; Hoseini, Damirchi, & Babaei, 2017; Hu et al., 2019; Morello et al., 2018; Wintermeyer et al., 2016; Zhang et al., 2018). However, most people are not getting enough VD, attributed to insufficient sun exposure, disease occurrence, and insufficient dietary intake due to the presence of VD in only some limited foods such as eggs, liver, mushrooms, and oily fish (Calvo & Whiting, 2013; Manoy et al., 2017; Tracy et al., 2017).…”