400mg melatonin refers to the weight of the tablet, not the amount of melatonin, the amount of melatonin in 400mg is 2.24mg, and the recommended daily dosage is 1 tablet.
400mg melatonin can only be taken one tablet at a time. Melatonin tablets are a health product with the health function of improving sleep and are mainly used for people with poor sleep conditions. Because of the hypnotic effect, those who are engaged in driving, mechanical work or dangerous operation, do not eat before or during the operation.
Improve sleep first need to develop good sleep habits, such as get up on time, go to bed, etc., but also need to change the concept of sleep and beliefs, do not need to pay too much attention to sleep and so on.
Melatonin is not a substitute for medication, if there is a serious sleep disorder, should be timely to the regular hospital, by the doctor according to the specific condition to give the right judgment of the treatment.