[blkknightarms]

From my understanding, insolate-endogenous D production has the potential to deliver up to several 100k IU in a day and is self-limiting, under optimal conditions, irrespective of ionizing radiation potential. On balance, most people tend to produce only around 1k IU/day incidentally. 2k IU/day from all sources is a typical upper advisory number (not a UL) for average individuals.

Ultimately, personalized recommendation that considers microcalcification deposition potential could determine the proper amount for a given patient.