BHB, as a naturally occurring energy substrate, is the transport (stable) form of ketone bodies.
BHB mineral salts, such as BHB sodium, calcium, and magnesium are hydrolyzed to free BHB and free metal ions upon ingestion.
BHB then travels through the blood and is actively transported into the brain and muscle. Once in the cell, BHB is converted into acetoacetate, then to acetyl CoA, to enter the citric acid cycle and generate ATP. ATP is the molecular unit of currency of intracellular energy transport.
BHB also has a plethora of other effects, typically opposing effects of glucose. Additional actions are potential HDAC inhibition and inflammasome inhibition.