Vitamin C should be taken at night if you prefer but in reality Vitamin C works great when taken either at night or in the morning or anytime of the day.
Vitamins such as Multivitamins should be taken in the morning while other vitamins are best taken at night.
Vitamins that are best taken at night include.
Iron if you are taking Active Iron.
Vitamin D.
Vitamin C.
Vitamin E.
Magnesium.
You can take a multivitamin at night, as long as you take it with a small bit of food to coat your stomach and to help your body absorb the fat-soluble vitamins.
Taking vitamins at night is not the best though because your digestion and metabolism are slower at night which means your body takes longer to digest the vitamins and allow them to work.
In the morning and evenings your digestion and metabolism are working better and faster and so the body can absorb, digest or take in the vitamins much easier and faster.
Because these supplements commonly contain both fat- and water-soluble vitamins, it's typically recommended to consume them with a meal.
This may enhance the absorption of certain nutrients while reducing the risk of gastrointestinal upset, which can otherwise occur when taking a multivitamin on an empty stomach.
For some supplements, optimal absorption can depend on the time of day taken.
Not only that taking certain vitamins, minerals, or other supplements together can also reduce absorption and may result in adverse interactions, which can be harmful to your health.