Enables the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: myo-inositol(out) + Na+(out) = myo-inositol(in) + Na+(in).
Synonyms:
broad_synonym:
myo-inositol-sodium cotransporter activity
xref:
reactome:R-HSA-429663 "SLC5A3 (SMIT1) transports myo-inositol (Ins) with Na+ from extracellular region to cytosol"