Is it 5000IU per day?
We don't know. Since you asked, here's the comment from one of the more recent meta-analyses to discuss dose in connection with all-cause mortality, Autier 2014:
...Results of meta-analyses and pooled analyses consistently showed that supplementation could significantly reduce the risk of all-cause mortality, with relative risks ranging from 0·93 to 0·96 (table 4). Most trials included elderly women and a sizeable proportion of individuals were living in institutions. Decreases in risks of death were not associated with trial duration and baseline 25(OH)D co
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