Vitamin B3 – Niacin – is important for brain function, digestive health and skin to name just a few. Niacin is known to help reduce cholesterol. Food sources are liver, lean meat, white meat of poultry, kidney, fish and eggs (take note vegetarians). You also get it from avocados, green vegetables and brewers yeast. For supplementation, I recommend the flush free form of Niacin.