A fast-fermented (2-3 day) whole-soybean paste, cousin to natto, made with Bacillus subtilis. Stringy, pungent, and intensely savory, it carries one of the highest concentrations of Bacillus probiotics and vitamin K2 of any everyday food.
An affordable, shelf-stable, high-protein probiotic that fits a budget — soybeans are cheap, and the ferment delivers supplement-level K2 and probiotics from a pot of stew.
Cheonggukjang's Bacillus subtilis fermentation produces high levels of vitamin K2 (menaquinone-7), the form most effective at directing calcium into bone and away from arterial walls — a dual benefit for the elevated osteoporosis and cardiovascular risk in Black communities. The fermentation generates fibrinolytic enzymes (nattokinase-type) that have been studied for breaking down clot-forming fibrin and modestly lowering blood pressure, directly relevant to the hypertension burden. Bacillus subtilis spores survive digestion to act as probiotics that strengthen the gut barrier and modulate immunity, and the fermentation makes the soy isoflavones more bioavailable while the fiber and protein support blood-sugar control and satiety.
Cooked whole soybeans are fermented warm (around 40°C) for 2-3 days with Bacillus subtilis until sticky and stringy, then mashed (often with garlic, chili, salt) into a paste used for stew. Add late in cooking to preserve the live cultures and enzymes.
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