Books & Guides
Vitamins and Minerals 101 by Chris Masterjohn, PhD
Testing Nutritional Status: The Ultimate Cheatsheet by Chris Masterjohn, PhD
The Food and Supplement Guide for the Coronavirus by Chris Masterjohn, PhD
Genetic Testing
You can get a 23andMe test performed and then download your data and run it through numerous online tools, many of them free.
GeneticGenie
Strategene
FoundMyFitness
Lab Testing
Organic Acids Test by Great Plains