can plaque be helped with nattokinase

The short version: the evidence retrieved does not contain a single study on nattokinase and coronary plaque in humans. The hypothesis is plausible on mechanism, but it is untested in the question you asked.

The evidence block is empty. That is the most important fact. No trial, no observational study, no case series, no animal model, nothing. The question asks whether nattokinase can help with plaque. The answer from the evidence provided is: we do not know. Not because it was tested and failed, but because it was never tested in the form you asked about.

Plausible mechanism is not proof. Nattokinase is a fibrinolytic enzyme from natto. It breaks down fibrin clots and may reduce blood viscosity. In theory, that could stabilize plaque or slow progression. But theory is cheap. The body has many ways to compensate, and what works in a test tube often fails in a person. Without a single human study on coronary plaque, the hypothesis remains speculation.

My call: the evidence does not support using nattokinase for plaque. Confidence: not clear — the gap is not uncertainty about weak data, it is the complete absence of data on the specific question.