Vitamin A

The upper tolerable limit for old aged person is 10,000 IU for Vitamin A. You can get it from dairy products, animal foods and fish. Also, beta-carotene (from yellow and orange veggies) gets converted to vitamin A in the body. “But the body is fully enough that it doesn’t convert all that to vitamin A,” said by Rosenbloom.

If you are already taking a multivitamin that contains 5,000 Integrational Unit, getting A-fortified foods in your diet and eating foods that contain vitamin A, you are probably OK.

Vitamin B3 (niacin)

The maximum limit for old age is 35 mg per day.

Vitamin B-6

Vitamin B-6is a water-soluble vitamin. It means you just pee out the excess. People have problems with temporary nerve damage. They lose feeling in their feet and hands.

Vitamin B9 (folate)

Taking too much vitamin B9 can lead to behaviour changes, abdominal cramps, sleep disorders, irritability, digestive issues, seizures, confusion, nausea, skin reactions and more. Rich intakes of folic acid can also mask a vitamin B12 deficiency. The maximum limit for old age is 1,000 mcg per day.

Vitamin C

People at risk for kidney stones may increase the risk; people also may get diarrhea. Most of people have food poisoning who had taken too much vitamin C. People are not aware how potent these vitamin supplements are.”

Vitamin D

The risk is that we get too much, which may actually cause calcium to reach out of your bones.” Vitamin D is found in some orange juice products, some calcium supplements are fortified with vitamin D. If you are somebody who may not drink dairy, getting vitamin-fortified orange juice makes sense. If you do drink dairy, then you take a supplement. It is that layering that I get concerned about, she says.

Vitamin E

People focus on vitamin E to prevent macular degeneration, Alzheimer’s, cancer, heart disease “the list goes on,” says Blumberg. The upper tolerable level is 1,000 milligrams; the RDA is 30 IU”. It didn’t have any adverse effects. In another study, people took 800 internationals units for six years, with no adverse effects, he says.

Possible side effects of multivitamins

Possible side effects of multivitamins are as like below:

A good diet is the best way to obtain these nutrients.

Most of the side effects are more common than others.

Common side effects

Certain side effects are more likely to occur than others when you are taking multivitamins. These include:

  1. diarrhea
  2. constipation
  3. upset stomach
  4. nausea

These gut-related side effects are generally temporary and minor.

Rare side effects

Rare side effects of multivitamins include:

  1. gout
  2. headaches
  3. nosebleeds
  4. insomnia

Other factors that can cause multivitamin side effects

Multivitamins can also become contaminated with harmful compounds, such as lead or arsenic.

When you ingest these harmful compounds in large amounts or over a longer period of time, they can cause a variety of health issues, including neurological, physical and muscular problems, as well as birth defects.

It is impossible to identify whether multivitamin contains these harmful compounds by looking at its label alone.

However, some manufacturers opt to get their supplements verified by third-party labs, which may confirm whether they are free of contaminants and that they truly contain what the label states.

Some examples of independent supplement testing companies include ConsumerLab and U.S. Pharmacopeia and NSF International.

Side effects in infants and children

Side effects in children are similar to those that older age may experience. However, children are likely to experience them at much lower doses than older age.

In other words, children who take multivitamins may have a higher risk of consuming extremely high levels of nutrients, which may lead to nutrient overdoses and even death in severe cases.

Companies market many multivitamins specifically for children and infants.


Pay attention to food labels, says by Rosenbloom. If you see 100% of RDA, you can not need a multivitamin supplement.

For a small fee, a nutritionist may evaluate your diet for deficiencies. Also, some online programs may provide the same service.

Blumberg’s prudent advice: “Take a multivitamin. Take a calcium supplement, if you do not drink much milk. If you are taking medicine that interferes with nutrient absorption, if you are an older person whose calorie intake is low, if you are an athlete.

We have decided to purchase vitamins, regularly follow the daily recommended dose to avoid excessive intake. Before purchasing it is recommended that you consult a nutritionist or physician to receive an assessment.

An overdose of vitamins K, A, E, D may cause serious or life-threatening side effects

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