Several supplements can meaningfully lower triglycerides, with omega-3 fatty acids offering the strongest and most consistent evidence. How much they help depends on the supplement, the dose, and how elevated your levels are to start. Most people see changes on blood work within 8 to 12 weeks of consistent use, though some interventions show effects in as little as 4 weeks.
For context, the American College of Cardiology considers triglycerides below 175 mg/dL normal, 175 to 499 mg/dL moderate, and 500 mg/dL or higher severe. The supplement approach that makes sense for you depends partly on where you fall in that range.
Omega-3 Fatty Acids: The Strongest Option
Omega-3s from fish oil are the most studied and effective supplement for lowering triglycerides. A large Cochrane review of 86 randomized controlled trials covering over 162,000 participants found that omega-3 supplementation reduced triglyceride levels by about 15% on average. The American Heart Association recognizes 4 grams per day of EPA plus DHA as an effective dose for managing high triglycerides, whether used alone or alongside other lipid-lowering treatments.
There’s an important distinction between prescription omega-3 products and the fish oil capsules you’ll find at a pharmacy or health food store. Prescription versions are highly purified, FDA-regulated for potency and safety, and specifically approved for severe hypertriglyceridemia. Over-the-counter fish oil supplements are regulated as food, not medication. They don’t require proof of efficacy before being sold, and independent testing has found significant quality problems. In one study of 32 fish oil products sold in New Zealand, only 3 contained EPA and DHA at levels matching their labels. The majority had less than 67% of the stated content.
If you’re using over-the-counter fish oil, look for products that carry third-party testing seals and list the exact amounts of EPA and DHA per serving (not just “fish oil”). To hit the 4-gram therapeutic dose with a standard supplement, you may need to take several large capsules daily, since most contain only 300 to 500 mg of combined EPA and DHA per capsule. For triglyceride levels at 500 mg/dL or above, a prescription omega-3 product is a more reliable route.
Berberine: A Plant-Based Alternative
Berberine, a compound found in several plants including goldenseal and barberry, has gained attention for its effects on blood sugar and lipids. A systematic review and meta-analysis of placebo-controlled trials found that berberine significantly reduced triglycerides, with an average decrease of about 0.37 mmol/L (roughly 33 mg/dL). Study doses ranged from 300 to 1,500 mg per day, typically split into two or three doses, over periods of 84 to 140 days.
Berberine works through different pathways than omega-3s, primarily by influencing how the liver processes fats and sugars. This makes it particularly interesting for people who also have elevated blood sugar or metabolic syndrome, since it tends to improve both at once. The most commonly studied dose is around 1,000 to 1,500 mg per day, divided with meals. Gastrointestinal side effects like cramping or diarrhea are the most common complaint, and starting at a lower dose can help.
Soluble Fiber Supplements
Psyllium husk, the active ingredient in products like Metamucil, works by binding to bile acids in the gut and forcing the body to pull cholesterol from the bloodstream to make more. This process also reduces triglycerides. A dose-response meta-analysis of randomized controlled trials found that psyllium at doses below 10 grams per day produced significant triglyceride reductions, particularly during intervention periods shorter than 50 days.
Soluble fiber also slows glucose absorption after meals, which reduces the insulin spikes that drive fatty acid production. It promotes the creation of short-chain fatty acids in the gut, which further influence how the liver handles lipid metabolism. The practical advantage of psyllium is that it’s inexpensive, widely available, well-tolerated, and also helps with cholesterol and digestive regularity. Start with a small dose and increase gradually to avoid bloating, and drink plenty of water with it.
Curcumin: Promising but Complicated
Curcumin, the active compound in turmeric, has shown a meaningful effect on triglycerides in clinical research. A meta-analysis found that curcumin supplementation reduced triglycerides by an average of about 17 mg/dL. That’s a modest but real effect, and curcumin also appears to improve other metabolic markers.
The catch is bioavailability. Plain curcumin is poorly absorbed, rapidly broken down, and mostly eliminated before it can do much. Study results vary widely depending on the formulation used, and one trial using a highly bioavailable micellar form actually found no benefit for blood lipids at all. The most consistent results come from curcumin paired with piperine (a black pepper extract that dramatically improves absorption) or from specialized nanoparticle formulations. If you try curcumin for triglycerides, a formulation designed for enhanced absorption is essential. Standard turmeric capsules are unlikely to deliver enough active compound to matter.
Garlic Supplements
Garlic supplements provide a statistically significant but relatively small reduction in triglycerides. A meta-analysis of randomized, double-blind, placebo-controlled trials found that garlic reduced triglycerides by an average of 0.13 mmol/L (about 12 mg/dL) compared to placebo. Garlic oil preparations appeared more effective than other forms for triglyceride reduction specifically.
This makes garlic a reasonable addition to a broader strategy but not a primary tool on its own. If your triglycerides are only mildly elevated and you’re already making dietary changes, garlic supplements might contribute a small additional push in the right direction.
Niacin: Effective but Needs Caution
Niacin (vitamin B3, specifically the nicotinic acid form) has a long track record for improving lipid profiles, including lowering very high triglycerides in people at risk for pancreatitis. It’s available both over the counter and by prescription at higher doses.
The trade-off is side effects. Flushing, where your face and neck turn red and feel hot, is extremely common and is the main reason people stop taking it. Other side effects include headache, upset stomach, diarrhea, and skin rashes. More serious risks include liver damage, glucose intolerance, gout, and heart rhythm changes. Because of these risks, niacin at therapeutic doses really needs to be used under medical supervision with regular blood work monitoring. Taking it on your own at high doses is not a good idea, even though it’s technically available without a prescription.
Niacin and Omega-3 Interactions With Medications
If you take blood thinners, cholesterol medications, or other cardiovascular drugs, supplement interactions are worth knowing about. A systematic review of supplement-drug interactions found that garlic did not appear to interact meaningfully with warfarin in clinical studies. Omega-3s at high doses can have a mild blood-thinning effect, which matters if you’re already on anticoagulant therapy. Niacin combined with statin medications increases the risk of muscle problems and liver stress.
Berberine can affect how the liver processes certain drugs, potentially altering their blood levels. If you’re on any prescription medications, especially statins, blood thinners, or diabetes drugs, checking for interactions before adding a supplement is a practical step that can prevent problems.
How Long Before You See Results
Triglyceride levels respond to intervention faster than most people expect. Clinical trials have documented significant reductions from omega-3 supplementation starting at 8 weeks, with some dietary and supplement interventions showing effects as early as 4 weeks. Berberine studies typically ran 12 to 20 weeks. Psyllium showed significant triglyceride changes in under 50 days in several trials.
A reasonable plan is to start a supplement, keep your diet consistent, and recheck your triglycerides with a fasting blood test after about 8 to 12 weeks. This gives enough time for a legitimate change to show up while being early enough to adjust your approach if it’s not working. Keep in mind that supplements work best alongside the dietary basics: reducing sugar and refined carbohydrates, limiting alcohol, and maintaining a healthy weight. No supplement will fully compensate for a diet high in added sugars and processed starches, which are among the strongest dietary drivers of elevated triglycerides.