It may be helpful to just look in the index for the page. For each supplement it gives toxicity, adverse reactions, known effects, unproved benefits, reasons to use, sources, deficiency symptoms, etc. Food and Food Production Encyclopedia. Ref TX349 K58. Huge book of over 2,000 pages.
Food production is especially interesting.
Food and Nutrition. Ref TX349 C567. Newer but not necessarily better than the other food encyclopedias. Large section on the composition of foods, i.e., calories, vitamins and minerals, fat content, etc. Ref TX551 B64.