Niacin, also known as vitamin B3, is an essential nutrient that helps the body convert food into energy and is important for healthy skin, nerves, and digestion. According to the Office of Dietary Supplements (ODS) [2], niacin can be found in many foods, including meat, fish, poultry, and enriched and fortified grains. However, the sources cited do not mention any specific alcohol-free food sources that are particularly high in niacin.

It is important to note that alcohol consumption can interfere with the body's ability to absorb and utilize niacin, which can lead to a deficiency in this essential nutrient [2]. Therefore, it may be beneficial to limit alcohol intake and focus on consuming a balanced diet that includes niacin-rich foods or consider taking a niacin supplement under the guidance of a healthcare provider [3].

In conclusion, while there are many food sources that contain niacin, the sources provided do not list any specific alcohol-free food sources that are particularly high in niacin. It is important to maintain a balanced diet and limit alcohol consumption to ensure adequate intake of this essential nutrient.

Sources:
[2] "Niacin." Office of Dietary Supplements, National Institutes of Health, 14 Jul. 2021, https://ods.od.nih.gov/factsheets/Niacin-HealthProfessional/.
[3] "Niacin (Oral Route)." Mayo Clinic, Mayo Foundation for Medical Education and Research, 1 June 2021, https://www.mayoclinic.org/drugs-supplements-niacin/art-20364984.