Why do I feel weird after taking vitamins?

Asked by: Ms. Vivienne Jacobson  |  Last update: September 1, 2025
Score: 4.6/5 (24 votes)

Getting too much of certain vitamins One reason for this may be that people who take multivitamins tend to have higher intakes of vitamins and other nutrients from their diets than those who do not take them. Excessive levels of certain vitamins can lead to nausea and other gastrointestinal symptoms.

Why do I feel funny after taking vitamins?

Over hydrating and over-loading on nutrients causes the body to jettison excess minerals and vitamins so you end up feeling wiped out or nauseous.

Why do I feel lightheaded after taking vitamins?

Yes, certain vitamin supplements, especially in high doses, can cause side effects like dizziness and fatigue. For example, excess vitamin D or iron might lead to these symptoms. Always take supplements as directed and consult a healthcare professional if side effects persist.

Can vitamins make you feel unwell?

DON'T overdo it.

Taking too much of some vitamins can make you feel sick, so you don't want to overdo it with supplements.

How long does it take for your body to adjust to vitamins?

If you're starting a vitamin regimen, you may be wondering how long does it take for vitamins to work? It can take anywhere from several weeks to a few months of consistently taking a vitamin or mineral supplement to see noticeable changes, depending on several factors.

My vitamin D deficiency story

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How to tell if vitamins are working?

The easiest way to tell that a specific nutrient is working is that your body goes back to its normal functioning levels. One of the most common symptoms of vitamin deficiencies is low energy, so you may be able to feel a difference in your levels of fatigue after a few days or weeks of taking supplements [5].

Does your body flush out extra vitamins?

Certain vitamins — such as B and C — are water-soluble. If you take too much of them, your body simply flushes out the extra. Other vitamins — including A, D, E, and K — are fat-soluble. They aren't good to consume in high doses because your body holds onto the excess.

Why do I feel weak after taking vitamins?

They are taking too many vitamins results in overdosage, which can have serious consequences in the short or long term. Excessive vitamin consumption can cause extreme fatigue, weakness, nausea, vomiting, bone mass loss, and depression. These negative effects vary according to the type of vitamins consumed.

Which two vitamins pose the greatest risk of toxicity?

Fat-soluble vitamins (like A, D, E, and K) don't get flushed out in the urine, so they're the most likely to cause vitamin toxicity. Vitamins A and E may pose the greatest risk of toxicity, since they are so commonly taken and readily available.

How to flush vitamins out of your system?

Yes, by ensuring you consume plenty of water. This will encourage urination, allowing your body to shed the excess vitamin D and calcium more quickly. Prescription diuretics like furosemide can also be helpful. A diuretic is a medicine that increases fluid loss.

Why do vitamins make my head feel weird?

Taking vitamins like A, B6, D, and E can cause headaches when consumed in excessive amounts. If you have a headache after taking vitamins, these might be the culprits. Meanwhile, deficiencies in vitamins B12, D, and riboflavin (B2) are also linked to headache development.

Why do I feel off balance but not dizzy?

Common causes include inner ear problems, medicines, infections, and traumatic brain injury. These disorders can occur at any age. But they are most common as you get older. Treatment depends on the underlying cause and can include medicine, rehabilitation, and lifestyle changes.

What supplements should I avoid?

Some supplements that may pose risks include:
  • Vitamin K, which can reduce the effectiveness of blood thinners.
  • Gingko, which can increase blood thinning.
  • St. ...
  • Herbal supplements comfrey and kava, which can damage your liver.
  • Beta-carotene and vitamin A, which can increase the risk of lung cancer in smokers.

Why do I feel bad after taking supplements?

You're consuming the tablets on an empty stomach

This is because some vitamins and minerals such as vitamin C, folate (B9), vitamin E and iron can increase acid production in the stomach and bring on nausea, so try to take supplements at mealtimes. Food provides a buffering effect which can neutralise stomach acid.

What are bad reactions to vitamins?

Some common side effects include: Upset stomach: One of the most common side effects of multivitamin use is an upset stomach. This can include symptoms such as nausea, diarrhea, and constipation. Unpleasant taste: Some multivitamins can leave an unusual or unpleasant taste in your mouth.

Why do I feel dizzy after taking vitamins?

Vitamin D overdose can contribute to high levels of calcium in the blood. Vitamin A overdose can cause nausea and vomiting, dizziness, blurry vision.

How do I know if I'm taking too many vitamins?

Some water-soluble vitamins, if taken in very large doses, consistently can cause problems. The following can happen if you take three to 10 times above the recommended limit: Vitamin C - nausea, diarrhea, vomiting or headaches. Vitamin B3 - stomach pain, high blood pressure, vision problems and liver damage.

Can I take 5 different vitamins at once?

Combining multiple supplements or taking more than the recommended dose might raise the risk that they can cause harm, said Kitchin. To lower your risk of an overdose, try looking for a multivitamin with no more than 100% of the daily value for any one nutrient to avoid an overdose, said Kitchin.

Should you take breaks from vitamins?

It is more important that people do not experience any breaks in their daily supplementation of a vitamin, especially if they are taking it to manage a deficiency.

Why do I not feel good after taking vitamins?

One reason for this may be that people who take multivitamins tend to have higher intakes of vitamins and other nutrients from their diets than those who do not take them. Excessive levels of certain vitamins can lead to nausea and other gastrointestinal symptoms.

What vitamin am I lacking if I feel weak?

Nutrient deficiencies

Vitamin and mineral deficiencies, including B2, B3, B5, B6, B9, B12, C, D, iron, and magnesium, are among the most common causes of unexplained fatigue. Vitamin D deficiencies affect over 50% of the global population, and approximately 12.5% have iron deficiency anemia.

Who should not take multivitamins?

If you smoke or used to smoke, you should avoid a multivitamin with a large amount of beta-carotene and vitamin A, as those ingredients may increase the risk of lung cancer. You also want to watch the amount of vitamin A if you're pregnant, as it can lead to an increased risk of birth defects.

Does drinking water flush vitamins?

"As you intake more water you can begin to flush water soluble vitamins and minerals," Dr. Kinney told INSIDER. "Water soluble vitamins, such as the B Vitamins (B1, B2, B3, B6 & B12) & vitamin C, are not stored long term and may be excreted with excess water intake if you're not taking in proper supplementation, too.

Can vitamins build up in your system?

If you take supplements, do not take more than 100% of the RDA unless you are under a provider's supervision. Be very careful about taking large amounts of fat-soluble vitamin supplements. These include vitamins A, D, E, and K. These can build up in your body and may cause harmful effects.

What are the symptoms of too much vitamin D in your body?

The main consequence of vitamin D toxicity is a buildup of calcium in your blood (hypercalcemia), which can cause nausea and vomiting, weakness, and frequent urination. Vitamin D toxicity might progress to bone pain and kidney problems, such as the formation of calcium stones.