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, since humans have been mostly fine for the last 20,000 years in the UK without vitamin D tablets or eating lots of oily fish (which as you say is the biggest dietary source, followed by a bit in eggs & liver). Are we really saying vegetarians don't get enough without tablets ..surely that would have shown up by now ?
Supplementing milk, as is done here in the US benefits mainly children as many older adults have limited milk intake. The real question is; would supplementation with vitamin D HARM anyone?
Yup, it's fat soluble, and can't be excreted.But the amount of vitamin D you need to kill you is so incredibly enormous, it doesn't really matter very much.Also there's processes in the body that destroy it, that top out at up to maybe 30,000 IU/day or something.But that's not to say that having high vitamin D levels is necessarily healthy, just that it's not a poison in any sane amounts.And from an RDI point of view, there will be some fraction of the population that can't handle vitamin D in large doses.
Yes, cholesterol + UV B. It's incredibly cheap to manufacture, and seems to be very safe.