Ozanimod is a selective sphingosine 1-phosphate 1 receptor modulator (S1P1R) currently under investigation. A related editorial discusses the potential implications of the research so far. It notes that although the safety profile of ozanimod treatment appears promising, at this stage of development this was also the case for fingolimod (a licensed S1P1R), and that it is not yet possible to draw any conclusions between the comparative efficacy and safety of these two agents.