Soaking black beans in vinegar is mainly for people to better absorb the anthocyanins in black beans. Studies have shown that black beans have the best antioxidant and anti-free radical capabilities in an environment with a pH value of less than 7. Anthocyanins Vitamins are also more easily absorbed by the body. Although black beans soaked in vinegar have so many health benefits, they should not be eaten raw, especially for people with poor gastrointestinal problems. However, some nutrients are lost after heating, so it is recommended to cook it to 70% done.

Black beans soaked in vinegar have the functions of beautifying, losing weight, nourishing the kidneys, improving eyesight, and blackening the hair. It can effectively improve constipation, high blood pressure, hyperlipidemia, backache and leg pain, diabetes, prostate disease, white hair, coronary heart disease, and poor health. Decreased vision, eye pain, dryness, dizziness, and headaches caused by prolonged use of computers and televisions. At the same time, soaking black beans in vinegar has a good effect on improving eye diseases such as myopia.