Niacin (Vitamin B3) is an essential water-soluble vitamin involved in hundreds of metabolic reactions, including energy production, cellular repair, nervous system function, and lipid metabolism. Unlike most vitamins, niacin has been extensively studied for its ability to influence cholesterol and triglyceride levels when used at therapeutic doses.

Niacin may help increase HDL cholesterol ("good cholesterol"), while also supporting healthy triglyceride and lipid metabolism. Because of these effects, it has historically been used as part of cardiovascular health programs under medical supervision.

Potential Benefits
May increase HDL ("good") cholesterol
May support healthy lipid metabolism
May help reduce elevated triglycerides
Supports cellular energy production
Supports nervous system function
Contributes to healthy circulation
May support brain function and cognitive health
Mechanism of Action

Niacin serves as a precursor to the coenzymes NAD+ and NADP+, which are critical for:

Cellular energy production
Mitochondrial function
DNA repair
Antioxidant defense
Lipid metabolism

At higher therapeutic doses, niacin may:

Increase HDL cholesterol
Lower triglycerides
Reduce VLDL production by the liver
Forms of Niacin

Immediate-Release Niacin

Most effective for increasing HDL
Commonly causes flushing

Sustained-Release Niacin

Less flushing
Higher risk of liver toxicity at high doses

Niacinamide (Nicotinamide)

Does not cause flushing
Does not significantly improve cholesterol levels
Typical Dosages

For nutritional support:

25–100 mg daily

For cholesterol support (under physician supervision):

250–500 mg daily initially
Gradually increased as tolerated
Therapeutic doses may range from 1,000–2,000 mg/day
Side Effects

Common:

Skin flushing
Warmth or redness of the face and neck
Itching
Mild stomach upset

At higher doses:

Elevated liver enzymes
Increased uric acid
Elevated blood sugar
Gastrointestinal discomfort
Precautions
High-dose niacin should be used under medical supervision.
Liver function tests should be monitored during long-term high-dose therapy.
Use cautiously in patients with diabetes, gout, or liver disease.
Important Note

Niacin is a dietary supplement, not a medication. While it can increase HDL cholesterol in some individuals, modern cardiology increasingly focuses on overall cardiovascular risk, LDL cholesterol, ApoB, triglycerides, inflammation, and metabolic health rather than HDL alone. Decisions regarding therapeutic niacin use should be individualized and discussed with a healthcare professional.