Fig. 1. Time course of the incremental calcemia following ingestion of 12.5 mmol Ca loads from two different sources and with and without pretreatment with 25OHD. The top two lines are the calcemia curves observed in participants pretreated with 25OHD, and the bottom two, those measured without vitamin D. Error bars are 1 SEM. ( & represent Citracal^TM and & represent Oscal^TM.) (Copyright Robert P. Heaney, 2002. Used with permission.)