This is written by Steve Chaney, PhD, retired professor from the University of North Carolina a cancer
researcher. He has over 80 published articles in peer-reviewed journals. He shares these guidelines to try
and help clear up the confusion about what is real and true for the average consumer - you and me.
everyone seems to claim that their nutrition products are backed by substantial clinical research. Here are some guidelines
for evaluating these claims and deciding which company is the best.
1) Look for
intervention clinical studies (those involving giving the supplement to real people). Studies in test tubes, cell culture
dishes, and in animals don't always predict what will happen in people.
Epidemiologic or population studies
(those that compare what different population groups eat, for example) are good for proposing hypotheses, but until they are
tested in a clinical trial, they are not considered as proof of effectiveness.
As for the clinical studies,
if the study is measuring the delivery of a nutrient to the bloodstream, it does not need to be double blind or placebo-controlled.
On the other hand, if the study is measuring a health outcome (for example, lower cholesterol or decreased pain) it
should be both placebo controlled and double blind.
2) Look for studies that have been published in peer-reviewed
If a company tells "that their scientists have shown ...", you have no way of evaluating
the quality of their data unless it has been peer-reviewed and published in a credible journal.
You also need to
know that there are advertising journals as well as credible scientific journals. An advertising journal will accept
any article for a price and there is no peer review to evaluate the quality of the data. If in doubt as to whether a
journal is credible, check it out on PubMed, the National Library of Medicine web site.
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMedFinally, the same is true for studies reported in the newspaper, in magazines, and in books, even
in those written by popular authors. Many of those articles can best be characterized as "nutrition fiction"
and have not been peer-reviewed by scientists in the field.
3) The studies should be done with the company's
actual product in the population group it is designed for. Many companies will say that their product contains ingredient
"X" that "has been shown to". In fact, that doesn't guarantee that the original studies were
valid or that the ingredient will have that effect in their product.
Companies will also quote studies that were done on other company's products.
Because Shaklee does
more studies than anyone else, many nutrition companies quote Shaklee clinical studies in support of their products.
Of course, their products were formulated differently than Shaklee's and they don't have the quality controls,
so there is no guarantee that their product will perform as well as Shaklee's product.
4) Look for a
large number of clinical studies on a variety of different products.
Some companies have only one or two credible
products and all of their clinical studies are focused on that product. They'd like you to think their other products
are just as good, but in fact many are not backed by any credible research.
5) Make sure that they are not
being selective in the studies they tell you about.
For example, one major manufacturer of garlic touts two clinical
studies which show that their product lowers cholesterol, but neglects to tell you about two other studies which showed that
their product had no effect on cholesterol levels.
If they tell you that such studies are impractical, too expensive,
or nnecessary, don't believe them. Shaklee has shown that if a company is committed to making the best products
possible, such studies are essential.
Shaklee, America's #1 Natural Health Company, has
conducted over 80 clinical studies on a wide variety of their products. Those studies are all published in peer-reviewed
Steve Chaney, Ph.D.