White vinegar soaked onions are a common food with no medicinal properties. More than 80% of white vinegar is water, and the main flavor component is acetic acid, as well as some fermented fruit acids, citric acid, and some free amino acid sweeteners. Onion is a vegetable that contains about 40 calories per 100g of onion and about 23mg of calcium. Onions also contain polyphenols, sulfur compounds, flavonoids and other bioactive components. These active ingredients help maintain blood cholesterol at a healthy level and have good antioxidant and anti-mutagenic effects. However, the dose of these components in onions is limited and cannot prevent or cure diseases. White vinegar soaked onions do not have the efficacy of drugs, and will not bring new nutrients, but fortunately, the various nutrients in the onion in an acidic environment is more stable, white vinegar in the acid will not destroy the nutrients of the onion, so there is no harm in eating this way.