Sprouted onions are usually grown green, there is no relevant research to prove its toxicity, can be consumed, but not recommended.
Onion is a common vegetable in life, according to the Chinese food composition table, per 100 grams of onion for 40 calories, containing 9 grams of carbohydrates, 0.9 grams of dietary fiber, but also contains potassium, calcium, phosphorus and other minerals and a variety of vitamins, moderate consumption of onions can supplement the above nutrients.
Onion by drying treatment, can be stored for a longer period of time will not germinate or mold. However, without dry treatment or improper storage, will also sprout or rot. Unlike potatoes, which produce toxic substances, sprouted onions are usually edible if they are not rotten.
Since some of the nutrient transfer occurs with sprouted onions, which affects their taste and nutritional value, it is not recommended to eat sprouted onions; eating fresh onions ensures the quality of the ingredients and the nutritional value of the food.