Usually multivitamins are recommended to be taken after meals because multivitamins contain mainly B vitamins, vitamin C, vitamin A and vitamin D. All of the above vitamins are water-soluble and usually also acidic. If taken on an empty stomach, it can cause certain erosion of the mucous membrane of the gastrointestinal tract and the gastrointestinal tract, causing this effect of digestive and absorption insufficiency. Therefore, it is recommended that multivitamins be taken best after a meal, 30 minutes after taking them. In addition, multivitamins are usually not recommended to be taken before bedtime. Vitamins contain certain excitatory effects on neurotransmitters, for example, so taking them before bedtime can cause excitation of the nervous system and, therefore, can have a negative effect on sleep. In summary, the best time to take a multivitamin is 30 minutes after a meal.