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Also 1 egg contain 41 IU(about 10% RDA) and 1 cup yogurt contains 80 IU(about 20% RDA)

the current RDA estimates are, in my view, substantially under-considered.

Hi @cristi I've written an article about you, check it out if you can.

22 Best Steemit Bloggers Of The Week To Follow July 2017

https://steemit.com/steemit/@jzeek/22-best-steemit-bloggers-of-the-week-to-follow-july-2017