The name "raspberry ketones" is misleading as this group of supplements does not contain any of the "ketones" that our body makes itself. There is a "ketone" chemical group in the molecule, which gives it its name, but raspberry ketones are not an energy source.
H.V.M.N. Ketone Ester contains BHB, a naturally produced ketone that the body can use as fuel.
Raspberry ketones are reported to help with weight loss, but the clinical evidence for this effect is very weak.