What Vitamins Should You Not Take At Night?
It may not be ideal to take vitamin D, B complex vitamins, and multivitamins at night. Research suggests vitamin D can interfere with the effects of melatonin and interrupt sleep.
B complex vitamins may cause a boost in energy and cause sleep disruptions.
![]()
Vitamins, minerals, and supplements can interact, affecting absorption and effectiveness. Timing and combination matter to prevent reduced benefits, nutrient deficiencies, or toxicity.
Common conflicts include calcium with iron or magnesium, zinc with iron or magnesium, and vitamin C with B12 or copper. Spacing doses prevents deficiencies and adverse effects.
Supplements may also interact with medications, like calcium with thyroid drugs or herbal products with blood pressure medicines. Consult healthcare providers for safe combinations and optimal nutrient absorption.
Why Some Vitamins And Minerals Should Not Be Taken Together
Certain mineral and vitamin supplements are absorbed through the same channels. As a result, when taken at the same time, they compete with each other, potentially decreasing their absorption and effectiveness. On the other hand, taking certain supplements together can be beneficial.
Research in complementary and integrative health shows that nutrient interactions can be broadly classified as synergistic or antagonistic.
Synergistic effects: Nutrients enhance each other’s absorption and impact. Example: Vitamin D improves calcium absorption.
Antagonistic effects: One nutrient reduces the absorption of another, potentially leading to deficiencies. Example: Calcium can block iron absorption.
Doctors recommend multivitamins for certain vitamin deficiencies. If you're taking a vitamin supplement for any type of vitamin deficiency, you should try to take it at a time when your body can best absorb it.
Morning vs. night
Some people claim that it's better to take vitamins at night because your body gets food and nutrition throughout the day. They argue that taking vitamins at night will be more beneficial for your body as it will absorb the vitamins when you are asleep.
However, taking your supplements at night isn't a good practice because your digestion and metabolism slow down when you're asleep. This means that when you take vitamins at night, they are not absorbed as efficiently as during the day.
The best time to take vitamins really depends on the type of vitamin you're taking. Some vitamins should be taken in the morning for maximum absorption. Others, especially those that promote relaxation, are best taken before you go to bed.

Best time to take vitamins by type
Since vitamins should be taken when they can be best absorbed by your body, here's a breakdown of when certain vitamins should be taken.
In the morning
All B vitamins (except for folate) are involved in your body's processes of producing energy. Therefore, supplements of these vitamins may have an energizing effect. For example, it's better to take vitamin B12 in the morning for this reason.
It's also important to take vitamin B6 during the day. When taken at night, it can interfere with sleep and cause vivid dreams.
In the evening
Vitamin E is an antioxidant and has many benefits for people who have trouble sleeping. Since vitamin E has a neuroprotective effect, it is best to take it in the evenings or at night. You can take vitamin E supplements with dinner or just before you go to bed.
With food
Some vitamins — notably, the fat-soluble vitamins A, D, E, and K — should be taken with food for maximum absorption. Vitamin D should ideally be taken with the largest meal of the day.
You should also take supplements such as calcium, magnesium, and iron with meals, as they may upset your stomach if you take them on an empty stomach.
To reduce the chances of upsetting your stomach, taking vitamins with food to aid digestion and improve absorption is wise.
Without food
On the other hand, water-soluble vitamins — the B vitamins and vitamin C, especially — are best absorbed on an empty stomach. Taking these before a meal, such as breakfast, is ideal.
Reference:
- buzzrx.com/blog/what-vitamins-should-not-be-taken-together
- medicinenet.com/vitamins_in_the_morning_or_in_the_night/article.htm
وبلاگ تخصصی سلامت شامل مجموعه مطالب پزشکی است و اطلاعات مفیدی در رابطه با بهداشت، ایمنی، سلامتی بدن و راه های پیشگیری از بیماریها را در اختیار شما کاربر محترم می گزارد.