I wish someone knowlegeable would add information about the odor of this chemical, and the mechanism and routes of excretion from the human body. Does it mix with acetone to modify the breath odor that would have been associated with acetone alone? David Spector (talk) 23:43, 23 July 2010 (UTC)
Compare the structure of BHB to what structurally defines a ketone: "Ketones feature a carbonyl group (C=O) bonded to two other carbon atoms." Notice on the right side of the posted skeletal structure of BHB, that the carbonyl group is bound to one carbon atom (R on the ketone page example), but also an OH (R') group, which does not contain carbon. Thus, β-hydroxybutyric acid is not a ketone.