Adelle Davis sold a lot of books with some good info as a dietitian and some which has been proven to be wrong. Yes, I have read some of her books. If you disagree, that is your choice. Research does not support some of the recommendations she made including the one about bone meal for a calcium supplement. Heavy metals like mercury are stored in bone. Depending on the source of bone meal (usually slaughtered animals), it can contain mercury.
My undergraduate minor was in chemistry and I have taken biochemistry in college. Biochemistry classes focus on the chemical structure of biological compounds including vitamins and minerals rather than the relationship between food and health.