Linked from
The 7 pages that link to Nicotinamide, each with the reason it gives.
NADPHBroader topic: Its ring accepts and donates the hydride carried by NADPH.
NADHBroader topic: Its ring accepts the hydride that converts NAD+ into NADH.
PellagraRelated: It treats niacin deficiency without the flushing commonly caused by nicotinic acid.
Vitamin B3Broader topic: It is the second principal form of vitamin B3.