The price of Niacin NF Tablet may vary slightly depending on the location or time due to factors such as promotions or local pricing. Some people may experience side effects such as nausea, vomiting, diarrhoea, stomach upset, flatulence, flushing, skin redness, or headache. Serious effects are rare but can include liver problems or increased blood sugar levels. It is usually recommended to take the tablet after meals to help reduce the chance of stomach upset and flushing.