The practice of vinegar black beans: raw materials: black beans 3-5 kg, aged vinegar 1-2 kg. Practice: First fry the black beans until they are 70-80% cooked, add vinegar, and shake them continuously in the middle to make them soak evenly. You can eat them after one month. How to eat: Take 20-30 capsules as snacks between 5-7 pm every day (when the kidney meridian is at its peak). So often taken, can make white hair black, kidney and kidney.