Many celebrities and sporting personalities have endorsed the campaign, which now has thousands of supporters.

Some celebrities have endorsed the use of creative visualization and claimed it had a significant role in their success.

When celebrities endorse products, there's the potential for side effects.

Many celebrities have also endorsed the ensemble with support including:

If a celebrity endorsed one product, invariably he or she turned up peddling several others.

To use celebrities to endorse products they do not use is unethical.

For example, when a celebrity like Lauren Hutton endorses hormone replacement for the treatment of menopause, consumers might assume the therapy is right for them.

Executives also liked the idea of having the celebrities endorsing their product.

The study also found that people were confused about which products some celebrities endorsed.

Wayne Gretzky and other celebrities brought in by McDonald's enthusiastically endorsed its program yesterday, but analysts and consultants offered more diverse reactions.