With regard to vitamin D, taking into consideration that the tolerable upper level of intake set by Health Canada is 4,000 IU per day and that the limit for a dose allowed by Health Canada is 1,000 IU per dose: (a) why has the amount allowed in one dose not been modified to reflect what is considered a safe intake; and (b) what is the rationale for the 1,000 IU per dose limit?
In the House of Commons on March 19th, 2018. See this statement in context.