Heart health and diet
How to Lower High Triglycerides: What Actually Works
Reviewed by a qualified clinician · analysed at UKAS-accredited UK labs (ISO 15189)
Last reviewed July 20269 min read
Every Helvy guide is written by our health editors, then checked by a qualified clinician before it goes live and re-checked as the science moves. We name clinical roles, not individuals, until each reviewer has agreed to be credited publicly. This is wellness guidance to help you understand your own data, not a diagnosis.
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The biggest levers on high triglycerides are lifestyle: cut added sugar and refined carbs, reduce alcohol, lose excess weight and move more. These often lower triglycerides fast. Omega-3 can help too, but the meaningful drops come from prescription-strength doses under a GP. The honest way to know if your changes work is to measure before and after.
Want to see your own numbers? Build your test →As of July 2026.“Supplements for high triglycerides” is a rising question this month, and omega-3 fish oil is the answer most feeds reach for. The real picture is more useful, and a little less flattering to the supplement aisle, so it is worth getting right.
Triglycerides are the most diet-responsive number on a lipid panel. That is good news: they often move quickly when you change a few habits. It also means the fix people reach for first, a supplement, rarely moves the number most.
This guide covers what actually lowers triglycerides, what UK cardiology bodies say about omega-3, and how to check whether it is working with your own blood.
1. First, know your number
Triglycerides are the main type of fat in your blood. Your body makes them from spare calories, especially sugar and alcohol. “High” is not one line in the sand, so it helps to know where you sit.
UK labs report triglycerides in millimoles per litre (mmol/L). The fasting ranges below follow HEART UK and NHS guidance.
| Category | Fasting (mmol/L) |
|---|---|
| Normal | Below 1.7 |
| Borderline high | 1.7–2.3 |
| High | 2.3–5.6 |
| Very high | Above 5.6 |
Very high levels (above about 5.6 mmol/L) raise the risk of pancreatitis and need a GP, not a supplement. For the full picture on testing, fasting and what each result means, see our triglycerides blood test guide.
2. What actually lowers triglycerides
Here is the part the supplement conversation skips. The biggest movers on triglycerides are not pills. They are the everyday inputs that raise the number in the first place. HEART UK and the NHS point to the same short list.
- Cut added sugar and refined carbs. Sugary drinks, cakes, biscuits and white bread all push triglycerides up. This is usually the single fastest lever.
- Reduce alcohol. Alcohol changes how your body handles triglycerides and can raise them sharply. Some people with high levels are advised to cut back well below 14 units a week.
- Lose excess weight. Even a modest drop in body weight can meaningfully lower triglycerides for many people.
- Move more. Regular aerobic exercise helps. HEART UK suggests aiming for at least 150 minutes a week at a moderate pace.
- Choose better fats and more oily fish. Swap saturated fat for unsaturated, and eat oily fish such as salmon or mackerel, which is where dietary omega-3 naturally comes from.
None of this is glamorous, and that is the point. A blood test measures biomarkers and offers wellness insight; it does not diagnose disease, and any result that worries you is a conversation for a qualified clinician.
3. Do omega-3 supplements actually work?
Partly, and with an important catch. Omega-3 fatty acids (EPA and DHA, the active fats in fish oil) genuinely lower triglycerides. But the size of the effect depends heavily on the dose, and the honest answer is less tidy than the supplement label suggests.
The British Heart Foundation is direct about where over-the-counter supplements sit.
“Omega-3 supplements are not recommended to prevent heart disease, unless your GP prescribes them for high triglyceride levels, as the evidence behind taking them to improve your heart health is mixed.”
— British Heart Foundation, Heart Matters
Two things sit inside that sentence. First, the triglyceride-lowering effect is real enough that GPs do prescribe high-dose omega-3 for it. The American Heart Association's 2019 science advisory found that prescription-strength doses (around 4g a day of EPA and DHA) can lower triglycerides by roughly 20 to 30 percent in people with high levels.
Second, that is a prescription dose. Typical shop-bought fish oil capsules contain far less active omega-3, so they do much less. And the BHF flags a genuine catch: taking more than about 2g a day can nudge your LDL (“bad”) cholesterol up while it brings triglycerides down. More is not automatically better.
The sensible read: omega-3 is a reasonable part of a broader plan, and oily fish is worth eating either way. Omega-3 may support normal blood fats as part of a balanced diet. But if your triglycerides are high, the lifestyle levers above do the heavy lifting, and a therapeutic dose is a GP decision, not a self-prescription. Our guide to supplements worth taking covers where omega-3 fits in a sensible stack.
4. Is it working? Measure it
Because triglycerides move so fast, they are rewarding to track. The approach is simple: test now, make your changes for 8 to 12 weeks, then test again under the same conditions (same time of day, same fasting status).
Read triglycerides alongside the rest of the panel, not alone, because they rarely move in isolation:
- Triglycerides themselves, the diet-responsive headline number.
- Non-HDL cholesterol, the total of your harmful cholesterol-carrying particles, often the cleaner signal of overall risk. See our cholesterol blood test guide.
- HbA1c, your average blood sugar, because high triglycerides and blood-sugar problems often travel together.
- ApoB and Lp(a), the particle-level markers that add cardiovascular context beyond standard cholesterol. Our ApoB guide explains why.
Helvy's Advanced Heart Health panel (£159) measures triglycerides, the full lipid profile, non-HDL, ApoB, Lp(a), hs-CRP and HbA1c in one home finger-prick test. It is run by UKAS-accredited UK laboratories, with results in around 5 working days. That before-and-after turns a guess into your own data.
READY TO TEST?
See whether your changes are actually working
Test your triglycerides before you start, cut the sugar, alcohol and excess weight for 8 to 12 weeks, then test again. Helvy's home finger-prick panels measure your full lipid profile, with results in around 5 working days from UKAS-accredited UK laboratories, so you can see your own response rather than guessing.
Frequently asked questions
What lowers triglycerides the fastest?
For most people, cutting added sugar, refined carbs and alcohol is the fastest lever, because triglycerides are made from spare calories, especially sugar and alcohol. Losing excess weight and regular aerobic exercise add to it. Triglycerides are the most diet-responsive lipid marker, so changes can show up on a retest within a few weeks.
Do omega-3 fish oil supplements lower triglycerides?
Omega-3 does lower triglycerides, but mainly at high doses. The American Heart Association found prescription-strength doses (around 4g a day of EPA and DHA) cut triglycerides by roughly 20 to 30 percent. Typical shop-bought capsules contain much less, so they do less, and the British Heart Foundation notes that over 2g a day can raise LDL cholesterol. A therapeutic dose is a GP decision.
What is a normal triglyceride level in the UK?
UK guidance puts a normal fasting triglyceride level below 1.7 mmol/L. Between 1.7 and 2.3 is borderline high, 2.3 to 5.6 is high, and above 5.6 mmol/L is very high and raises the risk of pancreatitis. Very high levels need a GP rather than a supplement.
How long does it take to lower triglycerides?
Faster than most lipid markers. Because triglycerides respond quickly to diet, meaningful changes can appear within a few weeks of cutting sugar and alcohol. For a fair before-and-after blood test, allow 8 to 12 weeks of consistent changes and test under the same conditions both times.
Which blood test shows if my triglycerides are improving?
A lipid panel measured before and after. Read triglycerides alongside non-HDL cholesterol, HbA1c, ApoB and Lp(a) for the full picture. Helvy's Advanced Heart Health panel measures all of these in one home finger-prick test, so you can see your own response over 8 to 12 weeks rather than relying on averages.
Related guides
Triglycerides Blood Test UK
What the test measures, UK ranges, fasting, and how to read your result.
Cholesterol Blood Test UK
LDL, HDL, triglycerides and the ratios that actually matter, explained.
Omega-3 Index Blood Test
How to measure your omega-3 status and whether fish oil is moving it.
Heart Health Blood Test
The full set of markers behind cardiovascular risk and how they fit together.