Instruct: Classify the given review as either positive or negative.
Query: This book is a joke

This book is absolutely ridiculous. Yes, there are scams involving vitamins, but there are con artists in EVERY industry/profession. Many of their arguments are illogical and/or just plain silly. The authors are clearly very biased, and, ironically (though not to my surprise), they provide no scientific references from the literature to support their claims. Further, the argument that vitamins pills would grow on trees if we needed them is an example of their illogical and unreasonable nature. Fortunately doctors like Herbert don't grow on trees; for if they did, we would surely be comdemned to a life of mediocre health. Herbert, with his perpetual campaign against nutritional supplements, is doing humans a disservice in an age of a degraded food supply and overwhelming evidence that nutrients can prevent and treat disease.