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Home›Wellbeing›Healthy Living›Can You Overdose on Vitamins?

Can You Overdose on Vitamins?

January 20,2020
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Taking vitamins is part of the daily routine of millions of people worldwide.

Though directions for safe dosing are listed on most supplement bottles, it’s common practice to take more than what’s recommended.

Consumers are bombarded with health information telling them that taking high doses of certain vitamins can benefit their health in many ways. However, taking too much of some nutrients can be dangerous

When consumed naturally through foods, these nutrients are unlikely to cause harm, even when consumed in large amounts.

Yet, when taken in concentrated doses in supplement form, it’s easy to take too much, and doing so can lead to negative health outcomes.

When taken in excess, some water-soluble vitamins can cause adverse effects, some of which can be dangerous.

However, similarly to vitamin K, certain water-soluble vitamins have no observable toxicity and hence no set UL.

These vitamins include vitamin B1 (thiamine), vitamin B2 (riboflavin), vitamin B5 (pantothenic acid), vitamin B7 (biotin), and vitamin B12 (cobalam)

It’s important to note that while these vitamins have no observable toxicity, some of them may interact with medications and interfere with blood testing results. Therefore, caution should be taken with all nutritional supplements.

The following water-soluble vitamins have set ULs, as they can cause adverse side effects when taken in high doses:

Vitamin C. Although vitamin C has relatively low toxicity, high doses of it can cause gastrointestinal disturbances, including diarrhea, cramps, nausea, and vomiting. Migraines can occur at doses of 6 grams per day.

Vitamin B3 (niacin). When taken in the form of nicotinic acid, niacin can lead to high blood pressure, abdominal pain, impaired vision, and liver damage when consumed in high doses of 1–3 grams per day.

Vitamin B6 (pyridoxine). Long-term overconsumption of B6 can cause severe neurological symptoms, skin lesions, sensitivity to light, nausea, and heartburn, with some of these symptoms occurring at intakes of 1–6 grams per day.

Vitamin B9 (folate). Taking too much folate or folic acid in supplement form may affect mental function, negatively impact the immune system, and mask a potentially severe vitamin B12 deficiency.

Note that these are side effects that healthy people may experience when taking large doses of these vitamins. Individuals with health conditions can experience even more serious reactions to taking too much of a vitamin.

For example, though vitamin C is unlikely to cause toxicity in healthy people, it can lead to tissue damage and fatal heart abnormalities in those with hemochromatosis, an iron storage disorder.

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