I bought this book to use a guide with my supplement use, but I was very disappointed to find that this book had been written during the time of the spanish inquisition. This book is quite old, and there are many more recent studies and books that supersede what this book talks about with respect to supplements, minerals, etc.
Any information and or knowledge gleaned from this book should be taken with a grain of salt.
I have been involved with health topics for almost 30 years, and this book is the most comprehensive one that I have seen on vitamins and minerals. The author discusses dozens of vitamins and minerals along with the disease symptoms of too little or too much of a vitamin or mineral. For example, the easiest vitamin to overdose on is Vitamin D, and yet we must have it to maintain strong bones. Patricia tells the overdose limit in her book for this vitamin as well as others. Since many people do not eat right, they can easily become vitamin deficient in some areas, especially as a person gets older and food is not digested as well. The author tells how to recognize vitamin and mineral deficiencies and what to do about it. You'll be glad you bought this book!