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NAM and NA are used in the intestines to generate NAD + (NA might be preferred for this) and absorbed from the intestines to enter the bloodstream for distribution to the liver and peripheral tissues.[23,27] While NAM is the primary circulating form of niacin [30,60], both of these forms of vitamin B3 increase tissue levels of NAD + with each having some degree of tissue-specificity and different pharmacokinetics (well discuss more about this in future articles on the Preiss-Handler Pathway and Salvage Pathway)