Human Sodium dependent multivitamin transporter (hSMVT) deficiency is a very rare genetic disorder, which has been reported so far in only 17 patients from 10 families (Subramanian et al., 2017; Byrne et al., 2019; Schwantje et al., 2019; Hauth et al., 2022; Holling et al., 2022; Montomoli et al., 2023; Rupasinghe and Onyeador, 2023; Utsuno et al., 2023). Here, SLC5A6 is linked to hereditary disease.