Dylai pawb dros flwydd oed anelu at lefel maethynnau a argymhellir (RNI) o 10 microgram o Fitamin D y dydd, bob dydd o’r flwyddyn.
Everyone in the population over one year of age should aim to achieve a recommended nutrient intake (RNI) of 10 micrograms for vitamin D per day, throughout the year.