Niacin (Prescription)
Prescription ·Exploratory record · not publication-reviewed ·Updated July 13, 2026
Prescription niacin is nicotinic acid (vitamin B3) used at gram-level doses far above the nutritional requirement to treat dyslipidemia. It lowers triglycerides and LDL cholesterol while raising HDL cholesterol, but its routine use has declined because large outcome trials (AIM-HIGH, HPS2-THRIVE) did not show added cardiovascular benefit when combined with statins and raised safety concerns. Available as immediate-release and extended-release tablets, it carries a high burden of flushing, hepatotoxicity, and worsened glycemic control.
Exploratory record, not a reviewed medical publication.
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What the research says.
A quick, data-only summary. The full evidence, dosing, and sources are below.
Prescription niacin is nicotinic acid (vitamin B3) used at gram-level doses far above the nutritional requirement to treat dyslipidemia. NutriStack rates the supporting evidence as strong. Common adult dosing is Extended-release: start 500 mg at bedtime, titrate slowly to 1000-2000 mg once daily. Immediate-release: start 250 mg once daily, titrate gradually to 1-2 g two to three times daily (max about 6 g/day)., though a prescriber sets the actual dose. With long-term use it can deplete chromium. This profile indexes 3 sources.
The bottom line
Evidence rating strong. Most-documented uses: lowers elevated triglycerides, lowers ldl cholesterol, raises hdl cholesterol. 3 sources indexed (2011–2018), with 0 interaction records on file.
How it works, mechanistically.
Core mechanism
At pharmacologic doses niacin inhibits hepatic diacylglycerol acyltransferase-2 (DGAT2), reducing triglyceride synthesis and VLDL secretion, which in turn lowers LDL and Lp(a). It also decreases lipolysis in adipose tissue, partly through activation of the GPR109A (HM74A) receptor, reducing free fatty acid flux to the liver. The same GPR109A activation in skin Langerhans cells triggers prostaglandin D2 release, causing the characteristic cutaneous flushing. Niacin additionally slows hepatic clearance of apolipoprotein A-I, raising HDL.1,2
Dosing & protocol.
Water-soluble. Extended-release niacin should be taken at bedtime after a low-fat snack to reduce flushing and GI upset. High-fat meals and alcohol or hot beverages near dosing worsen flushing. Immediate-release and extended-release forms are NOT interchangeable on a milligram basis because of differing hepatotoxicity profiles.3
What it depletes.
Nutrients this medication can lower over time, and what to replace.
Chromium
MildHigh-dose nicotinic acid is a component of glucose tolerance factor and influences chromium handling; pharmacologic niacin therapy has been associated with increased urinary chromium excretion and altered chromium status. This is mechanistically linked to niacin's well-documented tendency to impair insulin sensitivity and worsen glycemic control, and chromium repletion has been studied as a way to mitigate niacin-induced glucose intolerance. Evidence for clinically meaningful depletion is limited and inconsistent.
Full Niacin (Prescription) depletion and interaction guide →
Full safety detail.
Side effects
- Flushing (warmth, redness, itching of face and upper body)
- Pruritus
- Hepatotoxicity and elevated transaminases
- Worsened glycemic control and elevated blood glucose
- Increased uric acid and gout flares
- Nausea, vomiting, and dyspepsia
- Headache and dizziness
- Myopathy (especially combined with statins)
- Increased risk of bleeding and reduced platelet count
Contraindications
- Active liver disease or unexplained persistent transaminase elevations2
- Active peptic ulcer disease2
- Active arterial bleeding1
- Known hypersensitivity to niacin1,2
- Caution in diabetes mellitus due to worsened glycemic control1,3
- Caution in gout and hyperuricemia3
- Caution with concurrent statins (myopathy risk)
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Randomized controlled trials
2- 1Effects of Extended-Release Niacin with Laropiprant in High-Risk Patients (HPS2-THRIVE)PMIDHPS2-THRIVE Collaborative Group · New England Journal of Medicine · 2014
No reduction in vascular events with significant excesses of diabetes-related, gastrointestinal, musculoskeletal, infection, and bleeding adverse events.
- 2Niacin in Patients with Low HDL Cholesterol Levels Receiving Intensive Statin Therapy (AIM-HIGH)PMIDAIM-HIGH Investigators · New England Journal of Medicine · 2011
Extended-release niacin raised HDL and lowered triglycerides but provided no incremental clinical benefit over statin therapy alone and the trial was stopped early.
Reference material
1- 3Niacin extended-release (Niaspan) prescribing informationAbbVie Inc. · FDA-approved label · 2018
Label documents dose-related flushing, transaminase elevations requiring monitoring, worsened glycemic control, and elevated uric acid.
Common questions.
Quick answers about Niacin (Prescription), drawn from the data on this page.
What is Niacin (Prescription)?
Prescription niacin is nicotinic acid (vitamin B3) used at gram-level doses far above the nutritional requirement to treat dyslipidemia. It lowers triglycerides and LDL cholesterol while raising HDL cholesterol, but its routine use has declined because large outcome trials (AIM-HIGH, HPS2-THRIVE) did not show added cardiovascular benefit when combined with statins and raised safety concerns. Available as immediate-release and extended-release tablets, it carries a high burden of flushing, hepatotoxicity, and worsened glycemic control.
What is Niacin (Prescription) used for?
Commonly cited benefits of Niacin (Prescription) include: Lowers elevated triglycerides; Lowers LDL cholesterol; Raises HDL cholesterol; Lowers lipoprotein(a); Treatment of severe hypertriglyceridemia to reduce pancreatitis risk. NutriStack rates the overall evidence as strong.
What is a typical dose of Niacin (Prescription)?
A typical adult dose of Niacin (Prescription) is Extended-release: start 500 mg at bedtime, titrate slowly to 1000-2000 mg once daily. Immediate-release: start 250 mg once daily, titrate gradually to 1-2 g two to three times daily (max about 6 g/day).. The commonly recommended form is Extended-release tablet taken at bedtime with a low-fat snack. These are general ranges, not personalized advice; confirm the right dose with a clinician.
What are the side effects of Niacin (Prescription)?
Reported side effects include flushing (warmth, redness, itching of face and upper body), pruritus, hepatotoxicity and elevated transaminases, worsened glycemic control and elevated blood glucose, increased uric acid and gout flares, nausea, vomiting, and dyspepsia. This is educational information; check with a healthcare professional before use.
How strong is the evidence for Niacin (Prescription)?
NutriStack rates this as Strong, meaning multiple high-quality meta-analyses or systematic reviews converge on the same finding. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.
Use this with your stack
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