The disclosure provides derivatives of both the oxidized form and the reduced form of nicotinamide riboside (NR) and nicotinic acid riboside (NAR). The NR and NAR derivatives have improved stability and bioavailability compared to NR and NAR, and can increase cellular NAD+ levels and improve mitochondrial function. Therefore, the NR and NAR derivatives are useful for treating mitochondrial diseases, mitochondria-related diseases and conditions, and other disorders and conditions.