That would be 5g. At this point everyone should notice that something is off. :-D 5000 mg of vitamin D3 = 200,000,000 IU (200 million IU)
More often written as 200,000 IU as 5000mg of D3 is not written as 5,000,000mcg
The author simply (and terrible mistaking) typed [mg] instead of [UI] in the first paragraph: if readed entirely, the author correct this typo in every other sentence
People don't always realize: https://www.chemistryworld.com/news/university-fined-in-caff...