The best time for adults to drink formula every day is one hour before bedtime at night. Milk powder has a high nutritional value, and drinking it one hour before bedtime not only does not increase the burden on the gastrointestinal tract, but the nutrients in milk powder are fully absorbed and utilized by the intestines. A large amount of protein helps to supplement the brain nutrition and has a significant improvement on sleep; and vitamins and trace elements are absorbed during sleep and can be stored in the body to help the body’s utilization, especially the full absorption of calcium ions helps to prevent osteoporosis and enhance the strength of bones. In addition, adults drinking milk powder should also note that people with indigestion and bloating should not drink, because milk powder will increase gas production and aggravate the symptoms, while people suffering from gallbladder disease should not drink, because milk powder will lead to gallbladder absorption and induce biliary colic; and peptic ulcer people should not, because after drinking milk powder will stimulate the secretion of gastric acid and lead to stomach pain, leading to the aggravation of ulcers.