There is a concept of bioavailbility. Some vitamins & minerals are more absorbable than others, and if you have issues you can be asorbing or converting certai

There is a concept of bioavailbility. Some vitamins & minerals are more absorbable than others, and if you have issues you can be asorbing or converting certain ones not as well as you may think: https://en.wikipedia.org/wiki/Bioavailability https://en.wikipedia.org/wiki/Bioavailability Also do we know all the nutrients people need and amount also considering what is optimally healthy, genetics, age, medical conditions? Definitely not.