The vitamin Niacin functions as a coenzyme in:
1. Nucleoprotein synthesis
2. Hydrogen transport
3. Fatty acid synthesis
4. RBC production
(b) Niacin works in two enzyme systems (NAD and NADP). They affect all the tissues of the body. These enzyme systems help transport hydrogen within the cell. They also make it available for biosynthesis. These two enzymes also work closely with the energy molecule adenosine trisphosphate (ATP).