Mystery dosage for some nutrients

Unknown

The nutrition section gives measurements for most nutrients - for example, it says that I need 21g of fiber per day and tells me how many grams I've consumed. This is helpful.
BUT - when it comes to vitamins and some other nutrients, I'm in the dark. It says I routinely consume about 300% of Vitamin A, for example. But what does that mean? How many micrograms is 100%, and how many micrograms have I consumed? Same issue for calcium and iron.
Is there a section I can log into that I'm missing?

Unknown

Thanks for the advice and the link, Muppet Wrangler - I think I was expecting too much from MFP. I'm going to try a few of the recipes on the website - they look good!