At the end of the 18th and beginning of the 19th century electricity and magnetism were cutting edge science, full of excitement and unknown potential. Capitalizing on this excitement, Franz Anton Mesmer captured the imagination of the European intelligentsia with his bogus claims of animal magnetism. At the turning of the next century radioactivity was the new and fascinating scientific discovery, and this lead to a market for radioactive tonics good for a multitude of complaints, or just for extra energy. A few decades later radio waves were the latest healing craze.
Cutting edge science is cool and exciting, it evokes the promise of the future and the public has learned to expect that the latest gee whiz science appears like magic. Its newness also virtually guarantees that the public at large will mostly not understand the science or its true implications. This is a situation ripe for exploitation.
Today one medical technology that does possess great promise but is not yet ready for prime time is stem cell therapy. Legitimate scientists involved in stem cell research are almost giddy about the possibilities. Early applications are possibly just around the corner, and only time will tell what the full potential of this technology is. But right now there are no legitimate stem cell therapies outside of research protocols. It is therefore not surprising that the con artists of today are exploiting the tremendous hype of stem cells.