I have been following the guidelines in Dr. Colgan's book since it came out in 1982. I think the information in this book is as valuable now as it was when the book was introduced. About every 5 years, I review the profile to make sure that I am still on track with my vitamin and mineral intake.
I am 62 years old, have a lousy diet (lots of junk food), don't get nearly enough exercise and I am as healthy as a horse (I suppose I should knock on wood). I attribute this in large part to the fact that I am getting enough vitamins and minerals into my system thanks to Dr. Colgan.
I have not had a cold or flu since I started taking vitamins and minerals regularly; as far as I'm concerned they work. And Dr. Colgan's book will help you figure out the amounts that are right for you. It is the only vitamin book I know of that helps you establish the correct amounts; the only book that takes you and your lifestyle into consideration.
I highly recommend this book to anyone who will listen. I also highly recommend the religiously regular use of vitamins and minerals. If you don't take them regularly, they won't work for you.
Leland Sheppard