Dietary Supplement. Advanced Fibrin Defense Pharmaceutical Grade. *Neprinol Supports: Normal Inflammatory Response. Normal Immune Function. Enhanced Blood Viscosity. Optimal Circulatory Health. Healthy CrP & Fibrin Levels Neprinol is a proprietary combination of nattokinase, serrapeptase, rutin, alma and other proteolytic enzymes specially formulated to assist and defend your body from the damaging effects of fibrin. As fibrin builds up in our bodies, it may cause many unhealthy conditions. *Neprinol can help keep fib.