According to the sources provided, there is no specific information on a safe limit for alcohol consumption with niacin. However, it is important to note that alcohol can interfere with the absorption and metabolism of niacin, potentially leading to negative health effects.

The drugpatentwatch.com website provides information on the use of alcohol as a pharmaceutical ingredient. It does not provide information on the interaction between alcohol and niacin.

The Mayo Clinic website states that niacin can cause liver damage and that alcohol use can also damage the liver. Therefore, it is important to consult with a healthcare provider before combining niacin and alcohol. The website also suggests avoiding alcohol while taking niacin to reduce the risk of liver damage.

The Office of Dietary Supplements at the National Institutes of Health notes that alcohol can interfere with the absorption and metabolism of niacin, potentially leading to negative health effects. However, the website does not provide information on a safe limit for alcohol consumption with niacin.

In conclusion, while there is no specific information on a safe limit for alcohol consumption with niacin, it is important to consult with a healthcare provider before combining the two. It is also suggested to avoid alcohol while taking niacin to reduce the risk of liver damage.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ALCOHOL
[2] https://www.mayoclinic.org/drugs-supplements-niacin/art-20364984
[3] https://ods.od.nih.gov/factsheets/Niacin-HealthProfessional/