Ingredient guide
Niacin, or vitamin B3, is an essential vitamin. Deficiency is rare in well-fed populations. High-dose niacin strongly shifts cholesterol numbers and was once a common medicine, but later trials questioned its heart benefit and flagged side effects, so it is now used cautiously.
Moderate evidenceNiacin is vitamin B3, an essential water-soluble vitamin. It comes in two main forms, nicotinic acid and nicotinamide, which behave differently at high doses. Your body uses it to build coenzymes that power energy reactions in every cell. Food sources include meat, fish, whole grains, and legumes, so a true shortfall is rare where food is plentiful.
At everyday amounts, niacin simply does its vitamin job in energy metabolism. At very high, medicine-level doses, nicotinic acid does something extra. It changes how the body handles fats, which shifts cholesterol numbers, most notably by raising HDL, the helpful kind. That pharmacological effect is separate from its role as a vitamin.
Niacin has an interesting history. For decades, high-dose nicotinic acid was a leading way to improve cholesterol numbers, and it is genuinely effective at that on paper. Then large outcome trials raised doubts. Adding niacin on top of modern statin therapy did not clearly reduce heart events, and it brought side effects.
As a result, enthusiasm cooled, and niacin is now used far more cautiously and under medical care. We grade the evidence as moderate. Niacin reliably moves cholesterol markers, but moving the markers did not translate into the heart benefit people once hoped for, and the high doses carry flushing, blood sugar, and liver concerns.
As a vitamin, the small amount in food or a multivitamin is plenty. The high doses sold for cholesterol are a different matter and belong under medical supervision, because of flushing, blood sugar, and liver effects. If your goal is better cholesterol, talk to a healthcare provider rather than self-prescribing gram-level niacin.
The adult recommended intake is about 14 mg to 16 mg per day, easily met by food. The cholesterol effects need much higher amounts, often 1,500 mg to 3,000 mg per day, which are medicine-level doses with real side effects. The supplement upper limit for nicotinic acid is around 35 mg. Use high-dose niacin only under medical supervision.
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Nicotinic acid widens small blood vessels in the skin, causing a hot, red, tingling flush. It is harmless but uncomfortable and is most common at higher doses.
Only with medical supervision. Cholesterol-level doses can stress the liver, raise blood sugar, and cause flushing, so they need monitoring.
Rarely. A true niacin shortfall is uncommon where food is plentiful, so most people get enough from diet or a multivitamin.