Best Herbs and Supplements for Heart Health: 9 Ranked by Outcome and Risk-Factor Trials
The supplements with the best evidence for heart health are omega-3 fatty acids, psyllium fibre and red yeast rice, followed by coenzyme Q10 for people with heart failure or on statins and aged garlic extract for blood pressure. Each has randomised trials measuring either a hard outcome or a validated risk factor (LDL cholesterol, blood pressure, triglycerides), and three of them have outcome trials with thousands of participants. The rest of the list is ranked by how much human evidence exists, with the studied dose, because 'heart healthy' is one of the least regulated phrases on a supplement label.
This page is for adults with borderline cholesterol or blood pressure, a family history of heart disease, or a diagnosis they want to manage alongside their prescriptions. It is not a replacement for a doctor if you have chest pain, breathlessness on exertion, fainting, a racing or irregular pulse, or ankle swelling, and it is not a replacement for statins or blood-pressure drugs in people who need them: those reduce heart attacks and strokes by 25–30%, and nothing below comes close on its own.
One caveat before the list. The outcome trials have taught hard lessons: 4 g of prescription EPA prevented events while 1 g of fish oil did not; niacin and vitamin E raised HDL or antioxidant levels and prevented nothing; calcium tablets may do harm. Dose, formulation and the number you are actually trying to move all matter, so measure before and after.
Quick answer
- Omega-3 (EPA/DHA) — 4 g/day of prescription EPA cut major cardiac events by 25% in REDUCE-IT; 1 g/day fish oil did not prevent events in VITAL
- Psyllium — 10 g/day lowers LDL by about 13 mg/dL across 28 RCTs and carries an FDA heart-disease risk claim
- Red yeast rice — monacolin K lowered coronary events 45% in a 4,870-patient trial; product potency varies up to 60-fold
- Coenzyme Q10 — 300 mg/day roughly halved cardiovascular deaths in heart failure patients over 2 years (Q-SYMBIO)
- Aged garlic extract — lowers systolic blood pressure by 8–9 mmHg in hypertensive adults, comparable to a low-dose drug
- Beetroot (dietary nitrate) — drops systolic pressure 4–8 mmHg within hours and over 4 weeks
The 9 best herbs and supplements for heart health
Ranked by the strength of human evidence. Strong = multiple trials or a meta-analysis. Moderate = a few small trials. Preliminary = early or animal data.
Omega-3 (EPA and DHA)
Strong evidenceAt prescription doses, omega-3 changes outcomes: in REDUCE-IT, 4 g/day of icosapent ethyl (purified EPA) for a median 4.9 years cut major cardiovascular events by 25% in 8,179 statin-treated patients with high triglycerides. At supplement doses the picture differs: VITAL gave 1 g/day of fish oil to 25,871 healthy adults and found no reduction in the primary endpoint, though heart attacks fell 28% and more in people who ate little fish, and a 2020 Cochrane review of 86 trials found little or no effect on mortality. What every trial agrees on is triglycerides, which fall 20–30% at 2–4 g/day.
- Key evidence
- REDUCE-IT 2019 (Bhatt, NEJM, 8,179 patients) and Cochrane review 2020 (Abdelhamid, 86 RCTs)
- Studied dose
- 1 g/day EPA+DHA for general intake if you eat little fish; 2–4 g/day for high triglycerides, under medical supervision
- Best for
- High triglycerides, and people who eat oily fish less than once a week
- Cautions
- Increases bleeding tendency above 3 g/day; discuss with your doctor if you take warfarin, DOACs or antiplatelet drugs. High-dose EPA raised atrial fibrillation risk by about 1 percentage point in REDUCE-IT and STRENGTH. Fishy burps are common; freezing the capsule helps.
A 2018 meta-analysis of 28 RCTs found a median 10.2 g/day of psyllium for at least 3 weeks lowered LDL cholesterol by 0.33 mmol/L (about 13 mg/dL, or 6–7%) and non-HDL cholesterol by a similar margin, including on top of a statin. The FDA allows a heart-disease risk claim for 7 g/day of psyllium soluble fibre, one of the few supplement claims it permits. It also blunts post-meal glucose, lowers blood pressure by 1–2 mmHg, and costs pennies a day.
- Key evidence
- 2018 meta-analysis of 28 RCTs (Jovanovski, Am J Clin Nutr)
- Studied dose
- 7–10 g/day of psyllium husk, split across meals, in at least 250 mL of water each time
- Best for
- Borderline LDL, prediabetes, and anyone who also wants regular bowels
- Cautions
- Always take with plenty of water; dry powder can obstruct the throat or gut. Space it 2 hours from levothyroxine, digoxin, lithium, carbamazepine and iron. Rare allergy with occupational exposure.
Red yeast rice
Strong evidenceRed yeast rice contains monacolin K, chemically identical to lovastatin. The China Coronary Secondary Prevention Study randomised 4,870 people with a previous heart attack to a standardised extract (Xuezhikang, 1.2 g/day, roughly 10 mg monacolin K) or placebo for 4.5 years: coronary events fell 45% and all-cause mortality 33%. A 2015 meta-analysis of 20 RCTs found LDL reductions of about 1.0 mmol/L (39 mg/dL) versus placebo, similar to a moderate-intensity statin. The problem is the market: a 2017 analysis of 28 products found monacolin K content varied 60-fold, and some contained citrinin, a kidney toxin.
- Key evidence
- China Coronary Secondary Prevention Study 2008 (Lu, Am J Cardiol) and 2015 meta-analysis of 20 RCTs (Gerards)
- Studied dose
- 1,200–2,400 mg/day of a standardised extract providing 3–10 mg monacolin K, with the evening meal
- Best for
- Statin-intolerant people who need LDL lowering and will tell their doctor they are taking it
- Cautions
- It is a statin in every way that matters: same muscle pain, liver enzyme rise and interactions (grapefruit, clarithromycin, cyclosporine, fibrates). Never combine with a prescribed statin. Avoid in pregnancy, breastfeeding and liver disease. Buy only citrinin-tested products from brands that publish monacolin content.
Coenzyme Q10
Moderate evidenceIn Q-SYMBIO, 420 patients with moderate to severe heart failure took 100 mg CoQ10 three times daily or placebo for 2 years: major adverse cardiac events fell from 26% to 15%, cardiovascular deaths from 16% to 9%, and all-cause mortality from 18% to 10%. A 2017 meta-analysis of 14 RCTs (2,149 patients) found CoQ10 lowered mortality in heart failure by about 31%. For statin muscle pain, where it is most often used, results are mixed: a 2018 meta-analysis of 12 RCTs found reduced muscle symptoms, but the two best-designed trials found no difference from placebo.
- Key evidence
- Q-SYMBIO RCT 2014 (Mortensen, JACC Heart Fail) and 2017 meta-analysis of 14 RCTs (Lei and Liu)
- Studied dose
- 100 mg three times daily (300 mg/day) of ubiquinone, or 100–200 mg/day of ubiquinol, with fat-containing meals, for at least 3 months
- Best for
- Heart failure as an add-on to guideline therapy, and a 12-week trial for statin muscle aches
- Cautions
- Structurally similar to vitamin K and may reduce warfarin's effect; check INR after starting. Can lower blood pressure and blood glucose slightly, so monitor if treated for either. Mild insomnia at high evening doses.
A 2016 meta-analysis of 20 RCTs (970 participants) found garlic supplements lowered systolic blood pressure by 5.1 mmHg overall and 8.7 mmHg in people with hypertension, with diastolic down 2.5–6 mmHg; a 12-week RCT of 88 uncontrolled hypertensives on 1.2 g/day aged garlic extract found a drop of about 10 mmHg in responders. For cholesterol, a 2013 meta-analysis of 39 trials found total cholesterol down 17 mg/dL and LDL down 9 mg/dL after more than 2 months. A 2016 trial in 55 patients found aged garlic slowed coronary plaque progression over a year, which needs replicating.
- Key evidence
- 2016 meta-analysis of 20 RCTs (Ried, J Nutr)
- Studied dose
- 600–1,200 mg/day of aged garlic extract (Kyolic) standardised to S-allylcysteine, or 1.2 g/day of garlic powder tablets, for at least 8–12 weeks
- Best for
- Mild hypertension alongside lifestyle change, and people with slightly raised cholesterol
- Cautions
- Antiplatelet: avoid high doses with warfarin, DOACs and aspirin, and stop 7–10 days before surgery. Lowers blood pressure and glucose additively with drugs. Can reduce levels of saquinavir and other protease inhibitors. Odourless aged extract avoids breath and reflux problems.
A 2008 Cochrane review of 14 RCTs (855 patients) found hawthorn extract, added to standard treatment for chronic heart failure, improved maximal workload by about 5 watts, the pressure-heart rate product, and symptoms such as breathlessness and fatigue. The larger SPICE trial (2,681 patients, 900 mg/day WS 1442, 2 years) found no reduction in the combined primary endpoint but about 40% fewer sudden cardiac deaths in the subgroup with less impaired hearts. It is a mild positive inotrope and vasodilator rather than a blood-pressure herb; a 2006 RCT in 79 diabetics found only a 2.6 mmHg diastolic fall.
- Key evidence
- Cochrane review 2008 (Pittler, 14 RCTs) and SPICE trial 2008 (Holubarsch)
- Studied dose
- 160–900 mg/day of leaf-and-flower extract standardised to 18.75% oligomeric procyanidins (WS 1442) or 2.2% flavonoids, for at least 8 weeks
- Best for
- NYHA class II–III heart failure as an adjunct, with the cardiologist's knowledge
- Cautions
- Additive with digoxin, beta-blockers, nitrates and other vasodilators, including PDE-5 inhibitors; dizziness is the main side effect. Not a substitute for guideline heart-failure drugs. Insufficient pregnancy data.
Beetroot is rich in inorganic nitrate, which oral bacteria convert to nitrite and then nitric oxide, relaxing blood vessels. A 2013 meta-analysis of 16 trials found dietary nitrate lowered systolic blood pressure by 4.4 mmHg, and a 4-week RCT of 68 hypertensive patients found 250 mL of beetroot juice daily (6.4 mmol nitrate) lowered clinic blood pressure by 7.7/2.4 mmHg and improved endothelial function and arterial stiffness. Effects appear within 3 hours and are larger in people with higher baseline pressure. Whether it reduces events is untested.
- Key evidence
- 2015 RCT of 68 hypertensives (Kapil, Hypertension) and 2013 meta-analysis of 16 trials (Siervo)
- Studied dose
- 250–500 mL of beetroot juice, or 6–8 mmol (400–500 mg) nitrate from concentrated shots or powder, daily
- Best for
- Mild hypertension, and endurance athletes who also want the exercise-economy effect
- Cautions
- Antibacterial mouthwash blocks the effect by killing the oral nitrate-reducing bacteria. Additive with blood-pressure drugs and PDE-5 inhibitors. Beetroot is high in oxalate, so caution with calcium-oxalate kidney stones. Red urine and stools are harmless.
Magnesium
Moderate evidenceA 2016 meta-analysis of 34 RCTs (2,028 participants) found a median 368 mg/day of magnesium for 3 months lowered systolic pressure by 2.0 mmHg and diastolic by 1.8 mmHg, with larger drops of around 4 mmHg in people with insulin resistance or low intake. Cohort data link low serum magnesium to atrial fibrillation, sudden cardiac death and coronary calcification, and intravenous magnesium is standard for certain arrhythmias, but oral supplements have not been shown to prevent any of those in trials. Think of it as correcting a common shortfall (about half of US adults eat less than recommended) rather than a treatment.
- Key evidence
- 2016 meta-analysis of 34 RCTs (Zhang, Hypertension)
- Studied dose
- 300–400 mg/day of elemental magnesium as glycinate, citrate or taurate, with food, for 3 months
- Best for
- People with low dietary magnesium, palpitations with normal tests, diuretic users and metabolic syndrome
- Cautions
- Reduce or avoid in kidney disease; magnesium accumulates. Separate from quinolone and tetracycline antibiotics, bisphosphonates and levothyroxine by 2–4 hours. Loose stools signal too much or the wrong form (oxide, citrate).
Vitamin K2 activates matrix Gla protein, which stops calcium depositing in artery walls. In the Rotterdam cohort, high dietary K2 was associated with 57% lower coronary death, and a 3-year RCT of 244 postmenopausal women found 180 mcg/day of MK-7 reduced arterial stiffness versus placebo. But the outcome-relevant trials are not there yet: a 2022 RCT of 365 men with coronary calcification (720 mcg MK-7 plus vitamin D) found no slowing of calcium progression over 2 years, and a 2023 trial in aortic stenosis was also negative. Promising mechanism, unproven benefit.
- Key evidence
- 2015 RCT of 244 women (Knapen, Thromb Haemost) and the negative 2022 AVADEC coronary calcification RCT
- Studied dose
- 90–180 mcg/day of menaquinone-7 (MK-7) with a fat-containing meal
- Best for
- People on long-term vitamin D and calcium who want to hedge against arterial calcification, accepting the evidence is thin
- Cautions
- Directly opposes warfarin and will destabilise INR; do not take with vitamin K antagonists. No interaction with DOACs. Larger doses are not more effective. No concerns in pregnancy at dietary amounts.
How to choose
- If LDL is the problem, psyllium plus diet first; red yeast rice only if you are statin-intolerant and your doctor knows, because it is a statin.
- If triglycerides are above 150 mg/dL, omega-3 at 2–4 g/day EPA+DHA is the most reliable supplement change; at 1 g/day expect little.
- If blood pressure is the problem, aged garlic extract and beetroot nitrate each buy 5–8 mmHg; magnesium adds 2–4 mmHg if intake is low. Together they approach one low-dose antihypertensive.
- If you have heart failure, CoQ10 300 mg/day and hawthorn have outcome and symptom data as add-ons; do not stop prescribed drugs.
- If statins give you muscle aches, try CoQ10 200 mg/day for 12 weeks before abandoning the statin; it helps some people and harms none.
- Get a lipid panel and blood-pressure reading before starting and after 12 weeks. A supplement that does not move the number you are tracking is not worth continuing.
What to skip
Vitamin E
The HOPE trial gave 400 IU/day to 9,541 high-risk adults for 4.5 years: no reduction in heart attack or stroke, and a 13% increase in heart failure in the extension. Antioxidant theory did not survive contact with outcome data.
Niacin for cholesterol
It raises HDL and lowers LDL, but when added to a statin in AIM-HIGH and HPS2-THRIVE (over 29,000 patients) it prevented no events and caused more bleeding, infections and diabetes. 'No-flush' niacin (inositol hexanicotinate) does not even lower cholesterol.
Calcium supplements for the heart
Meta-analyses of calcium supplement trials have found a 25–30% increase in heart attack risk, plausibly from the rapid rise in blood calcium after a tablet. Get calcium from food, which showed no such signal.
'Heart health' multivitamins and antioxidant blends
The Physicians' Health Study II followed 14,641 men on a daily multivitamin for 11 years and found no effect on cardiovascular events. Beta-carotene supplements increased mortality in smokers in two large trials.
Safety and when to see a clinician
- Chest pain, breathlessness on exertion, fainting, a racing or irregular pulse, or ankle swelling need a clinician this week, not a supplement; nothing here treats an acute cardiac problem.
- Anticoagulant users (warfarin, apixaban, rivaroxaban, dabigatran) and antiplatelet users (aspirin, clopidogrel) must check before adding omega-3 above 1 g, garlic, CoQ10 or vitamin K2; the last two change warfarin's effect in opposite directions.
- Red yeast rice is a statin: never stack it with a prescribed statin, watch for muscle pain and dark urine, and avoid grapefruit, clarithromycin and cyclosporine.
- Garlic, beetroot, hawthorn, magnesium and CoQ10 all lower blood pressure a little; combined with prescribed antihypertensives they can cause dizziness and falls, especially in older adults. Check home readings.
- Magnesium accumulates in kidney disease (eGFR under 30), and psyllium binds several heart drugs (digoxin, warfarin, levothyroxine); separate doses by 2 hours.
- In pregnancy, omega-3 DHA is beneficial and psyllium and magnesium are safe; avoid red yeast rice, high-dose garlic and hawthorn.
What matters as much as any herb
- Blood-pressure medication and statins reduce heart attacks and strokes by 25–30% in people who need them. The best supplement here moves risk a fraction of that; use them alongside, not instead.
- Exercise: 150 minutes of moderate activity a week is associated with 20–30% lower cardiovascular mortality, and resistance training lowers systolic pressure by about 4 mmHg in meta-analyses.
- Sodium and potassium: cutting sodium to under 2 g/day drops systolic pressure 5–6 mmHg in hypertensives, and a potassium-enriched salt substitute cut strokes by 14% in the 21,000-person SSaSS trial.
- Not smoking and limiting alcohol: stopping smoking halves excess coronary risk within a year, and Mendelian randomisation studies find no protective threshold for alcohol.
- Sleep apnoea: untreated apnoea raises blood pressure and atrial fibrillation risk; loud snoring with daytime sleepiness deserves a sleep study before another supplement.
Frequently asked questions
What is the best supplement for heart health overall?
There is no single best one, because it depends on which number is wrong. For LDL, psyllium or (with medical oversight) red yeast rice; for triglycerides, 2–4 g of omega-3; for blood pressure, aged garlic and beetroot nitrate; for heart failure, CoQ10. Pick the one matched to your measured problem.
Is fish oil good for your heart?
At 4 g/day of purified EPA in people with high triglycerides on a statin, yes, it cut events by 25%. At the 1 g/day in a typical capsule, large trials found no reduction in events in the general population, though people who ate little fish benefited more. Eating oily fish twice a week remains the better-supported habit.
Does CoQ10 really help the heart?
In heart failure, the Q-SYMBIO trial found 300 mg/day halved cardiovascular deaths over 2 years as an add-on to standard drugs, and a meta-analysis agrees. For statin muscle pain the evidence is mixed. In healthy adults there is no outcome data at all, so it is a treatment for a diagnosis, not a daily tonic.
What herbs are good for heart health?
Garlic and hawthorn have the best trial evidence, for blood pressure and heart failure respectively. Hibiscus tea lowered systolic pressure by about 7 mmHg over 6 weeks in a 65-person RCT. Turmeric, cayenne and cinnamon have no cardiovascular outcome trials, whatever the label says.
Are heart healthy supplements safe with blood thinners?
Several are not. Omega-3 above 1 g, garlic and ginkgo add to bleeding risk; vitamin K2 blocks warfarin; CoQ10 may weaken warfarin. Psyllium, beetroot and magnesium are generally fine but should be separated from warfarin doses by 2 hours. Always tell the anticoagulation clinic.
Which supplements should I avoid for heart health?
Vitamin E, niacin alongside a statin, calcium tablets and beta-carotene all have large trials showing no benefit or harm. High-dose EPA is best avoided if you have a history of atrial fibrillation. Anything marketed as a 'heart health blend' with a dozen low-dose ingredients has never been tested as a product.
Can supplements lower cholesterol as much as a statin?
Red yeast rice can, because it contains the same molecule as lovastatin, lowering LDL by around 20–25%. Psyllium manages 6–7%, plant sterols about 8–10%, and berberine (covered in our cholesterol guide) 10–15% in meta-analyses. Only red yeast rice has an outcome trial, and it carries statin-type risks.
References
- Bhatt DL, Steg PG, Miller M, et al.. Cardiovascular Risk Reduction with Icosapent Ethyl for Hypertriglyceridemia (REDUCE-IT). New England Journal of Medicine (2019)
- Manson JE, Cook NR, Lee IM, et al.. Marine n-3 Fatty Acids and Prevention of Cardiovascular Disease and Cancer (VITAL). New England Journal of Medicine (2019)
- Abdelhamid AS, Brown TJ, Brainard JS, et al.. Omega-3 fatty acids for the primary and secondary prevention of cardiovascular disease. Cochrane Database of Systematic Reviews (2020)
- Jovanovski E, Yashpal S, Komishon A, et al.. Effect of psyllium (Plantago ovata) fiber on LDL cholesterol and alternative lipid targets, non-HDL cholesterol and apolipoprotein B: a systematic review and meta-analysis of randomized controlled trials. American Journal of Clinical Nutrition (2018)
- Lu Z, Kou W, Du B, et al.. Effect of Xuezhikang, an extract from red yeast Chinese rice, on coronary events in a Chinese population with previous myocardial infarction. American Journal of Cardiology (2008)
- Mortensen SA, Rosenfeldt F, Kumar A, et al.. The effect of coenzyme Q10 on morbidity and mortality in chronic heart failure: results from Q-SYMBIO. JACC: Heart Failure (2014)
- Ried K. Garlic lowers blood pressure in hypertensive individuals, regulates serum cholesterol, and stimulates immunity: an updated meta-analysis and review. Journal of Nutrition (2016)
- Pittler MH, Guo R, Ernst E. Hawthorn extract for treating chronic heart failure. Cochrane Database of Systematic Reviews (2008)
- Kapil V, Khambata RS, Robertson A, Caulfield MJ, Ahluwalia A. Dietary nitrate provides sustained blood pressure lowering in hypertensive patients: a randomized, phase 2, double-blind, placebo-controlled study. Hypertension (2015)
- Zhang X, Li Y, Del Gobbo LC, et al.. Effects of Magnesium Supplementation on Blood Pressure: A Meta-Analysis of Randomized Double-Blind Placebo-Controlled Trials. Hypertension (2016)
- Lonn E, Bosch J, Yusuf S, et al.. Effects of long-term vitamin E supplementation on cardiovascular events and cancer: the HOPE and HOPE-TOO trials. JAMA (2005)
- NIH Office of Dietary Supplements. Omega-3 Fatty Acids: Fact Sheet for Health Professionals (2023)View source
- National Center for Complementary and Integrative Health. Red Yeast Rice (2020)View source
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Ask about heart healthThis guide is educational and is not medical advice. Herbs and supplements can interact with prescription medicines and are not regulated like drugs. Talk with a clinician or pharmacist before starting anything new, especially if you are pregnant, breastfeeding, have a chronic condition, or take medication.