It's difficult to get enough from food, especially as you get older. It's cheap to buy D3 as 5,000 - 10,000iu but you need to also take K2 as MK7 to strip the extra calcium out of your bloodstream, where it's problematic and take it to your bones and teeth. K2 as MK7 can be expensive but it's very affordable from Poland[Sowelo], free postage too.
