Does nattokinase work against blood clots and for your heart?
The best available research shows that nattokinase has no demonstrable effect on arterial hardening or blood pressure after three years. In the short term there are mild biological signs of clot breakdown, but these do not translate into a proven clinical benefit.
A single dose of 2,000 FU of nattokinase improved several clot-related blood markers in 12 healthy young men: there were measurable signs of clot breakdown and clotting time was extended. However, all values remained within normal limits, and with such a small group firm conclusions are not possible.
Whether nattokinase also has a longer-term effect on arterial hardening was investigated in a study of 265 older adults who received 2,000 FU daily for three years. The result was clear: no measurable effect whatsoever on carotid artery wall thickness, arterial stiffness, blood pressure or clotting markers compared with a placebo. This is the strongest and longest study available, and the outcome is negative.
A small Chinese study in 76 patients did report a substantial reduction in carotid artery plaques after 26 weeks, even greater than that seen with a low dose of the cholesterol-lowering drug simvastatin. However, that finding directly contradicts the large study above, the statin dose used was on the low side, and the methodological details are limited. That contrast makes caution advisable.
For cholesterol, a separate caveat applies. A combination supplement of nattokinase together with red yeast rice lowered LDL cholesterol by an average of 0.43 mmol/L and total cholesterol by 0.52 mmol/L in people with elevated blood lipids. The problem is that red yeast rice contains a compound closely resembling a statin. What share of that effect belongs to nattokinase alone cannot be determined from this.
Nattokinase appears safe based on the available studies: even after three years of daily use, no serious side effects emerged. If you use blood thinners such as aspirin or an anticoagulant, discuss this with your doctor first, as the combination has not been studied in the trials.
The answer rests on a combination of human studies that vary considerably in size and quality. The strongest evidence comes from a study in which 265 people were followed for three years with either a placebo or the active treatment: that study found no effect. Set against this are smaller studies with more positive outcomes, one of which is seriously limited by its small size and methodological ambiguity. The cholesterol research was conducted with a combination product, so the effect of nattokinase alone cannot be isolated. The laboratory research into blood groups has not yet been confirmed in living people.
Is high homocysteine bad for my heart?
High homocysteine is associated with a greater risk of cardiovascular disease, but whether it is the cause is not certain. Have your levels checked by your doctor and discuss whether dietary changes or supplementation make sense for you.
Does CoQ10 help your heart or your energy levels?
For people with moderate to severe heart failure, CoQ10 has the most convincing evidence base; for energy or athletic performance in healthy people, the evidence is too weak to promise anything, though the supplement is safe.
Do omega-3s help against heart rhythm disorders?
Omega-3 supplements do not help against heart rhythm disorders and at higher doses actually increase the risk of atrial fibrillation. Eating fish regularly appears to be a different story, but always discuss rhythm problems with your doctor first.
Does treating inflammation in the coronary arteries through medication actually make a difference for your long-term heart health?
Targeted anti-inflammatory treatment, particularly with low-dose colchicine, measurably reduces the risk of serious cardiac events in people with coronary artery disease. Discuss with your cardiologist whether this is relevant for you, because not every drug works and there are safety considerations that require careful weighing.
Are calcium supplements bad for your heart?
Calcium supplements may be associated with an increased heart risk, but not all studies confirm this. Ideally, obtain calcium from your diet, and discuss with your doctor whether a supplement is truly necessary for you.
Do omega-3 (fish oil) supplements benefit my heart?
Fish oil reliably lowers triglycerides and can slightly reduce the risk of a heart attack in people with existing heart disease or high risk, but it does not demonstrably lower the overall risk of death. Always discuss its use with your doctor if you have a condition or are on medication.