I used to be a sales rep for a large vitamin/supplement company out of North Dakota. Roughly six(ish) months ago the whole Raspberry Ketones craze took off due to claims made on the Dr. Oz show.
It claimed that the ketones had thermogenic properties that burned fat. It flew off the shelf, and for the most part it sounded like results were minimal, if any. Never heard anyone claiming an increase in energy levels.
Hope this helps :-)