<prompt> Non vitamin coenzyme is :NiacinCoenzyme ALipoic acidSAM  <response>: Lipoic acid is a coenzyme required for Pyruvate Dehydrogenase and Alpha-Ketoglutarate Dehydrogenase but it is not a Vitamin Option 3. Niacin is Vitamin B3 work as coenzyme in its active form Nicotinamide adenine dinucleotide NAD for a number of dehydrogenase enzymes in metabolism Option 1. Coenzyme A is a derivative of Vitamin B5 - Pantothenic acid and works in acyi group transfer reaction Option 2. SAM - is S-Adenosyl Methionine, which is a methyl donor. It is neither a Coenzyme, nor a Vitamin Option 4. Extra information: Another Non-vitamin coenzyme is Tetrahydrobiopterin derived from guanosine triphosphate. Vitamin K is the only fat soluble vitamin which acts as coenzyme 