Just a simple question. How do you find out whether or not you're deficient in any vitamin and nutrients? Are there different tests for different type of nutrients or does it all just take a blood test?
I was also wondering what are the optimal amount of nutrients you should get daily. Recommended minimum and recommended limit. And what's a good site to look up about nutrients and more? Like what's the function of some, etc. I mean, I could always search around here but was wondering if other areas have more scientifically backed up info and would provide a simple brief definition.