CardiologyPublished: September 2026·Updated: September 2026·9 min read

Niacin for Triglycerides: An Old Drug's Unique Niche

Niacin for triglycerides is the oldest trick in the lipid book, and a more interesting one than its reputation suggests. Vitamin B3, given at pharmacological doses, lowers triglycerides by 20 to 50%, raises HDL, trims LDL and — almost uniquely among lipid drugs — lowers lipoprotein(a). It also has a history: the Coronary Drug Project, run between the 1960s and 1970s, showed a mortality benefit that only emerged at fifteen-year follow-up. Then came the modern statin-era trials, which found no extra benefit, and the fall from grace. We think the honest position lies in between: niacin is no longer a first-line drug, but for a narrow group of patients in Singapore it still earns its place.

Dr. Peter Chang

Triple Board-Certified Cardiologist & Vascular Specialist

The Short Answer: What Makes Niacin Different

Most triglyceride-lowering drugs do one job. Niacin — nicotinic acid, or vitamin B3 at pharmacological doses — does four at once. At 1 to 2 grams a day it lowers triglycerides by roughly 20 to 50%, lowers LDL cholesterol by 10 to 25%, raises HDL by 15 to 35%, and lowers lipoprotein(a), which almost nothing else does. That combination is the reason we still talk about niacin for triglycerides, decades after it was first used.

The honest counterweight is that lowering the numbers has not translated into fewer heart attacks in patients already well treated with statins. So niacin's role in Singapore today is a narrow, specialist one — a tool for particular lipid patterns, not a general-purpose supplement or a first-line prescription.

How Niacin Lowers Triglycerides: Two Routes at Once

Triglycerides are built in the liver and shipped out inside VLDL particles, using fatty acids that arrive largely from fat tissue. Niacin interrupts both steps. In the liver it inhibits DGAT2, the enzyme that performs the final step of triglyceride assembly, so fewer triglycerides are made and less VLDL is secreted.

In fat tissue, niacin activates a receptor called GPR109A, which lowers cyclic AMP and switches off lipolysis. Fewer free fatty acids reach the liver, so there is less raw material to begin with. Current thinking gives the liver route the larger share of the effect. It is a mechanism entirely different from fibrates, which work through PPAR-alpha, and from omega-3s — which is why, in a Singapore lipid clinic, niacin can be considered when those options fall short.

The Unique Extras: Lp(a), HDL and Small Dense LDL

Here is where niacin genuinely stands apart. It raises HDL by 15 to 35%, shrinks the number of small, dense LDL particles, and lowers lipoprotein(a) — in one study of people with diabetes, from 37 to 23 mg/dL, a fall of about 38%. Statins do not lower Lp(a), and until recently no widely available drug did. We covered why that matters in our post on Lp(a) and the HORIZON trial.

A caution: a lower Lp(a) or a higher HDL is a surrogate marker, not a result. Trials of HDL-raising drugs, niacin included, have repeatedly shown that moving the number does not guarantee moving the risk. In Singapore, where a raised Lp(a) is often found only when someone thinks to test it, niacin remains an interesting but unproven option for that group.

From the Coronary Drug Project to AIM-HIGH: Rise and Fall

Niacin's reputation was built early. In the Coronary Drug Project, men with previous heart attacks who took niacin had 11% lower mortality (52.0% versus 58.2%) at 15 years' follow-up. Then the statin era changed the question. AIM-HIGH added niacin to statin therapy in 3,414 patients and was stopped early for lack of benefit. HPS2-THRIVE, in 25,673 patients, found major vascular events in 13.2% on niacin-laropiprant against 13.7% on placebo, with more serious side effects.

In 2016 the FDA withdrew the niacin-statin combination tablets, concluding that lowering triglycerides or raising HDL on top of a statin had not been shown to cut events. One caveat: those trials enrolled statin-treated patients with well-controlled LDL — not the statin-intolerant or high-Lp(a) patients we still consider niacin for in Singapore.

Side Effects: Why Patients Stop Taking It

Most people who take niacin at lipid-lowering doses meet the flush: a hot, prickly, red wave across the face and chest, caused by prostaglandin release in the skin. It fades with continued use and can be softened, but it is the main reason people quit. More serious, and less common, are effects on the liver, blood sugar and uric acid — the last one particularly relevant in Singapore, where gout is common and often under-treated.

This is also why over-the-counter supplements are not a substitute. The doses that lower triglycerides are drug doses, well over a hundred times the 14 to 16 mg daily vitamin requirement, and belong under supervision with blood tests.

Flushing: take extended-release niacin at night with food; aspirin beforehand (if suitable for you) blunts it; avoid hot drinks and alcohol around the dose
Liver: transaminases checked at baseline and after dose increases
Blood sugar: niacin can raise glucose, so it is usually avoided in poorly controlled diabetes
Uric acid: can precipitate gout attacks in susceptible patients
Stomach upset, itching and dizziness are also common at higher doses

Where Niacin Still Fits, and Where It Does Not

In our practice, niacin for high triglycerides is a third- or fourth-line consideration, usually for someone with raised triglycerides and a raised Lp(a), or someone who cannot tolerate a statin or fibrate, and who has no diabetes, gout or liver disease. It is not for pregnancy, active peptic ulcer, or unexplained abnormal liver tests.

What niacin is not is a first move. For most people with high triglycerides the biggest levers are alcohol, sugar, weight and blood sugar — and for those with very high levels, a fibrate to protect the pancreas. Nicotinic acid tablets are on Singapore's Standard Drug List, but which formulations are stocked varies between pharmacies, so confirm before planning around it.

What to Try First for High Triglycerides in Singapore

Triglycerides above 1.7 mmol/L are considered raised, and above 5.6 mmol/L (about 500 mg/dL) the risk of pancreatitis rises sharply. The first steps are unglamorous but powerful: cut sugary drinks, refined carbohydrates and alcohol, lose weight if needed, and control blood sugar. Singapore's hawker-centre diet — white rice, sweet drinks, kopi with condensed milk — is a common driver.

If medication is needed, a statin comes first for cardiovascular risk. For patients on a statin with triglycerides of 1.5 to 5.6 mmol/L, icosapent ethyl cut major events by about 25% in REDUCE-IT. For very high levels, fenofibrate protects the pancreas. Notably, pemafibrate lowered triglycerides by more than a quarter in PROMINENT with no reduction in events — another reminder that the triglyceride number alone is not the target.

Seeing a Specialist in Singapore: Tests, Monitoring, Costs

A proper assessment starts with a fasting lipid panel, a one-off Lp(a), liver enzymes, HbA1c and uric acid — niacin is not a drug to start without knowing all four. At our clinic at Paragon Medical Centre on Orchard Road, a first consultation typically costs SGD 150 to SGD 350, and the extra blood tests add SGD 30 to SGD 80 for Lp(a) and a modest amount for the rest.

If niacin is chosen, we start low, build slowly and recheck liver enzymes, glucose and uric acid within 6 to 12 weeks of each dose change. Bring your medication list, previous lipid results and any supplements you take — including that bottle of vitamin B3 from the health shop, which we would rather know about.

Frequently Asked Questions

Common Questions About Niacin for Triglycerides

Does niacin lower triglycerides?

Yes. At 1 to 2 grams a day, extended-release niacin lowers triglycerides by roughly 20 to 50%, mainly by blocking DGAT2 in the liver and reducing the flow of fatty acids from fat tissue. It also lowers LDL, raises HDL and lowers Lp(a). What it has not done, in modern statin-era trials, is reduce heart attacks or strokes on top of statin therapy.

Is niacin better than fenofibrate or fish oil for high triglycerides?

Not better, different. Fenofibrate is generally preferred when triglycerides are very high because it also protects against pancreatitis, and icosapent ethyl has outcome data in statin-treated patients that niacin lacks. Niacin's distinct advantage is its effect on lipoprotein(a) and HDL, which makes it a specialist option for particular patterns rather than a replacement.

Why was niacin taken off the market with statins?

The FDA withdrew approval of the niacin-statin combination tablets in 2016 because large trials, including AIM-HIGH and HPS2-THRIVE, showed no added reduction in cardiovascular events over a statin alone, along with more side effects. Niacin on its own was not banned; it remains available, though it is now a niche prescription rather than a routine one.

Can I take over-the-counter niacin for high triglycerides in Singapore?

We advise against it. The doses that lower triglycerides, 1 to 2 grams a day, are well over a hundred times the 14 to 16 mg daily vitamin requirement, and can harm the liver, raise blood sugar and trigger gout. Some so-called no-flush forms do not lower lipids at all. In Singapore, start with a fasting lipid panel and a specialist review.

Does niacin lower Lp(a)?

Yes, by roughly 20 to 40% in studies, which makes it one of very few older drugs with that effect. But no trial has shown that lowering Lp(a) with niacin prevents heart attacks, and its side effects limit its use. We treat it as an option for selected patients, alongside aggressive LDL lowering, not as a proven Lp(a) therapy.

Who should not take niacin for cholesterol in Singapore?

Niacin is generally avoided in active liver disease, poorly controlled diabetes, gout, active peptic ulcer disease and pregnancy, and used with caution alongside certain other medicines. Singapore patients with any of these should discuss alternatives such as fenofibrate, a statin or lifestyle measures before considering it.