This is a simple but accurate infographic of why we need Niacin. Most people now know that antioxidants are important.
The human body has evolved ways to recycle crucial antioxidants like Vitamin C and Glutathione. Otherwise, we would never keep up with their dietary intake. Niacin is required to help regenerate 3 pivotal antioxidants.
Alcohol and Niacin have an interesting relationship. Too much alcohol intake to often will result in a shift in different versions of NAD and their subsequent ratios. This change in ratio level, induced by alcohol, can lead to changes in fat metabolism and resultant increased weight gain.