No single supplement can “clean out” clogged arteries the way a drain cleaner works on a pipe. But several supplements have genuine clinical evidence for slowing plaque buildup, stabilizing dangerous plaques, or modestly reducing artery blockages over time. The most studied options are nattokinase, aged garlic extract, vitamin K2, omega-3 fatty acids, and CoQ10, each working through a different mechanism.
Before diving into each one, it helps to understand the two things that actually matter in artery health. Plaque stabilization means strengthening existing plaque so it’s less likely to rupture and cause a heart attack or stroke. Plaque regression means actually shrinking the volume of plaque inside the artery wall. Most supplements work closer to the stabilization end of the spectrum. True regression typically requires aggressive lipid-lowering therapy, though a few supplements show early signs of contributing to it.
Nattokinase: The Strongest Plaque-Reduction Data
Nattokinase, an enzyme derived from a traditional Japanese fermented soybean dish called natto, has the most striking numbers of any supplement studied for artery plaque. In a clinical study of 1,062 participants, 12 months of nattokinase at a dose of 10,800 FU per day produced a significant reduction in both the thickness of the carotid artery wall and the size of carotid plaques. Improvement rates ranged from 66.5% to 95.4% across different measurements, and lipid profiles also improved significantly.
The dose matters enormously. The same study found that 3,600 FU per day, a dose commonly sold in retail supplements, was ineffective at lowering lipids or suppressing atherosclerosis progression. Most off-the-shelf nattokinase capsules contain 2,000 to 4,000 FU, meaning you’d need a substantially higher dose than what’s in a typical bottle to match the study results. Potential drug interactions with nattokinase haven’t been fully mapped in human studies, which is worth knowing if you take blood-thinning medications.
Aged Garlic Extract and Coronary Plaque
Aged garlic extract (AGE) is one of the more thoroughly studied heart-health supplements, with multiple trials specifically measuring its effect on coronary artery plaque using CT imaging. In a randomized, double-blind, placebo-controlled study of patients with diabetes, one year of AGE therapy produced a 29% reduction in low-attenuation plaque, the soft, fatty type of plaque most prone to rupturing. Meanwhile, the placebo group saw a 57% increase in the same type of plaque over that same year, representing the natural progression of the disease.
That’s a meaningful finding because low-attenuation plaque is considered the most dangerous kind. It didn’t significantly change total plaque volume or harder, more calcified plaque, but it targeted the type that cardiologists worry about most. Earlier studies in the general population have also shown that AGE slows the progression of coronary artery calcification.
Vitamin K2 and Arterial Calcification
Vitamin K2 works through a very specific biochemical pathway. Your body produces a protein called Matrix Gla Protein (MGP) that acts as a natural inhibitor of calcification in your arteries. But MGP only works when it’s activated, and that activation step requires vitamin K as a co-factor. Without enough vitamin K, MGP sits in your artery walls in its inactive form, unable to prevent calcium from depositing into soft tissue.
This is why vitamin K2 shows up so often in “artery cleaning” discussions. It doesn’t dissolve existing calcium deposits so much as it helps your body’s own anti-calcification system work properly. People who are deficient in vitamin K have higher levels of inactive MGP circulating in their blood, which correlates with greater arterial stiffness and cardiovascular risk. Supplementing K2 in this context is less about adding something therapeutic and more about correcting a deficiency that allows calcification to progress unchecked.
If you take warfarin or another vitamin K-sensitive anticoagulant, K2 supplementation can directly interfere with how your medication works. This is one combination where the interaction is well understood and potentially dangerous.
Omega-3s Stabilize Vulnerable Plaques
Omega-3 fatty acids, particularly EPA and DHA from fish oil, don’t necessarily shrink plaques. What they do is make existing plaques far less likely to rupture, which is arguably more important for preventing a heart attack. Most acute coronary events aren’t caused by the biggest blockages. They’re caused by unstable plaques with thin fibrous caps that tear open.
EPA physically incorporates into the plaque itself. In a trial of 121 patients awaiting carotid surgery, those who took roughly 1.5 grams of EPA/DHA daily for just three weeks before their procedure had significantly fewer inflammatory foam cells in their carotid plaques. Plaques with higher EPA incorporation showed less instability, less inflammation, and fewer T cells. The enzymes responsible for breaking down plaque structure (making rupture more likely) were also significantly reduced.
In a separate study of 30 patients with abnormal cholesterol, adding 1.8 grams per day of EPA to statin therapy for nine months increased fibrous cap thickness and reduced inflammatory cell accumulation compared to statin therapy alone. A thicker fibrous cap means a more stable plaque. The bottom line: people with low blood levels of omega-3s tend to have fattier, less fibrous, more rupture-prone plaques. Supplementation shifts that profile toward stability.
CoQ10 and Blood Vessel Function
Coenzyme Q10 doesn’t target plaque directly, but it improves the health of the blood vessel lining itself. A meta-analysis of randomized controlled trials found that CoQ10 supplementation significantly improved flow-mediated dilation, a measure of how well your arteries expand in response to increased blood flow. Improvements appeared after about eight weeks and were dose-dependent, meaning higher doses produced larger effects.
Healthy endothelial function is the first line of defense against atherosclerosis. When the inner lining of your arteries works properly, it resists the inflammatory cascade that leads to plaque formation in the first place. CoQ10’s role is more preventive and supportive than corrective.
Magnesium and Arterial Stiffness
Magnesium supplementation has shown a measurable effect on arterial stiffness, which is one of the key physical changes that happens as arteries accumulate plaque and lose elasticity. In one study, 24 weeks of magnesium citrate at 350 mg per day reduced pulse wave velocity (the gold standard measurement for arterial stiffness) compared to placebo, with the supplemented group measuring 8.3 m/s versus 9.1 m/s in the placebo group. Interestingly, this improvement occurred without any change in blood pressure.
That 0.8 m/s difference is clinically relevant. Epidemiological data shows that each 1.0 m/s decrease in arterial stiffness corresponds to a 14% reduced risk of cardiovascular events. Other studies on magnesium and arterial stiffness have shown mixed results, so the evidence is promising but not yet definitive.
Red Yeast Rice Lowers LDL Cholesterol
Red yeast rice contains monacolin K, which is chemically identical to the active compound in a commonly prescribed statin. It reduces LDL cholesterol by 15% to 25% within six to eight weeks, with one meta-analysis showing an average LDL reduction of about 39 mg/dL compared to placebo. Since LDL is the primary driver of plaque formation, lowering it slows the process that clogs arteries in the first place.
Because it works like a statin, it also carries similar risks: potential liver effects and muscle pain in some people. The concentration of the active compound varies widely between brands, making consistent dosing difficult without third-party testing.
What “Cleaning Arteries” Actually Means
The FDA has issued warning letters to companies selling supplements that claim to cure, treat, or prevent cardiovascular disease, including atherosclerosis. Under federal law, any product making those claims is classified as a drug and must go through drug approval. Supplements that promise to “unclog” or “clean” your arteries are making illegal claims.
That regulatory reality doesn’t mean these supplements are useless. It means the framing matters. The evidence supports several supplements for slowing plaque progression, stabilizing dangerous plaques, improving artery flexibility, and reducing the cholesterol that drives plaque formation. What none of them can do is reverse decades of arterial disease on their own or replace medical treatment for someone with significant blockages. The supplements with the strongest evidence, nattokinase, aged garlic extract, omega-3s, and vitamin K2, each address a different piece of the puzzle. Some people combine them for that reason, though studies on combined protocols are limited.