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'''Niacin''', (which is also known as nicotinic acid or vitamin B3), is a [[water]]-soluble vitamin. Nicotinamide is the metabolite of niacin and used by the body to form the coenzymes nicotinamide adenine dinucleotide phosphate (NADP) and nicotinamide adenine dinucleotide (NAD).  None of the forms are related to the nicotine found in [[tobacco]], although their names are similar.

'''Niacin''', (which is also known as nicotinic acid or [[vitamin]] B3), is a [[water]]-soluble vitamin. Nicotinamide is the metabolite of niacin and used by the body to form the coenzymes nicotinamide adenine dinucleotide phosphate (NADP) and nicotinamide adenine dinucleotide (NAD).  None of the forms are related to the [[nicotine]] found in [[tobacco]], although their names are similar.

Living organisms derive a great portion of their energy from oxidation-reduction (redox) reactions, transferring [[electrons]]. About 200 [[enzyme]]s require the niacin coenzymes, NAD and NADP, to accept or donate electrons in redox reactions.  

Living organisms derive a great portion of their [[energy]] from oxidation-reduction (redox) reactions, transferring [[electrons]]. About 200 [[enzyme]]s require the niacin coenzymes, NAD and NADP, to accept or donate electrons in redox reactions.  

NAD functions most often in energy producing reactions involving the catabolism of [[carbohydrate]]s, [[fat]]s, [[protein]]s, and [[alcohol]].  

NAD functions most often in energy producing reactions involving the catabolism of [[carbohydrate]]s, [[fat]]s, [[protein]]s, and [[alcohol]].  

NADP functions more often in anabolic reactions, such as in the synthesis of all macromolecules, including fatty acids and [[cholesterol]].

NADP functions more often in anabolic reactions, such as in the synthesis of all macromolecules, including fatty acids and [[cholesterol]].