Minerals are tricky because if they are not in the soil they are not in the vegetable or fruit. This has been a problem for a long time for example Plants need 9 minerals to grow big and strong but now they need to put on three minerals [NPK] on the soil so it is obvious that the 9 minerals the plant needs there is only 6 so where are all these other minerals they clam are in the vegetables.
This can be very misleadind when you see Brazil nuts have a lot of selenium but if where that tree grow there was no selenium in the soil there would be no selenium in the Brazil nuts. Plants can not make minerals