Vitamins, Minerals, and Supplements

To find out whether a supplement will provide specific benefits, it is necessary to understand how the immune system works in MS and how a specific vitamin or mineral will impact the immune system. As MS is an autoimmune disease in which the immune system appears to be attacking the body and causing damage to the CNS, any supplement that claims to boost or improve the immune system should be avoided. Additionally, in evaluating vitamins and minerals for use as potential symptomatic and/or disease-modifying treatments, it is important to look at evidence for the effectiveness and safety of these substances.

Dosing is an important factor with vitamin or mineral supplements. Vitamins or minerals taken at a certain dose may be beneficial. However, taken at a higher dose, the same vitamin or mineral may be harmful. So, it is very important to work with your doctor and other members of your care team to determine which supplements you should take and what the proper dose should be.

Basics about vitamins and minerals

Vitamins are organic substances that our bodies need to maintain health. Except for vitamin D, which is a hormone produced in the skin when exposed to sun, we typically get our daily requirement of vitamins from dietary sources (foods and drinks). Vitamin D can also be obtained from some foods.

Minerals are inorganic substances. Like vitamins, our bodies need certain minerals to stay healthy and we can get these from dietary sources. The Food and Nutrition Board of the National Academy of Sciences has defined the recommended daily allowance (RDA) of different vitamins and minerals that we need to consume on a daily basis. There is general agreement that we should get the RDA of basic vitamins and minerals to stay healthy. There is controversy, however, about whether we should take more than the RDA of certain vitamins and minerals. It is understood that getting too much of some vitamins and minerals may be dangerous to health. This is why it’s important to talk to your doctor before you take any vitamin or mineral supplement (or any other type of supplement).

Vitamins and minerals in MS

A variety of vitamins, minerals, and other related supplements have been considered for use as symptomatic and disease-modifying treatments for people with MS. However, there is a lack of sufficient research to make recommendations regarding the effectiveness and safety for all people with MS. Common vitamin and mineral supplements include vitamin D and vitamins and minerals with antioxidant effects, such as vitamins C and E and selenium.

Vitamin D

Vitamin D supplements are potentially important for people with MS from both the perspective of symptom management and disease-modifying effects. Vitamin D is recognized as an important factor in maintaining bone density and people with MS are at increased risk for bone loss (osteopenia and osteoporosis) for many reasons, including corticosteroid use, decreased sun exposure, and loss of mobility.

Results from several studies suggest that increased blood levels of vitamin D (as well as high intake of the vitamin) may be associated with a decreased likelihood of developing MS and a decreased risk of exacerbations and disability progression in people with MS. More studies are needed to determine a clear relationship between vitamin D and MS and for more definitive evidence as to whether vitamin D supplementation truly has disease-modifying effects. If you would like to use vitamin D supplements, talk to your doctor first. Your doctor can give you a blood test to find out your blood level of vitamin D and, if it’s below normal, your doctor may suggest a daily supplement amount to bring your levels up to normal.

Antioxidant vitamins

The idea behind taking antioxidant vitamins, which include vitamin A (usually taken as beta-carotene, which is a safer form of the vitamin), and vitamins C and E, is that these vitamins reduce damage caused by free radicals. A free radical (also called an oxidant) is a molecule in the body that has an unpaired electron. These molecules are very unstable because they are constantly trying to pair their unpaired electron. This causes them to react with other substances in the body, resulting in oxidative damage. The RDA of antioxidant vitamins can be obtained by eating 3 to 4 servings of vegetables and 2 to 4 servings of fruits every day. The safety of taking antioxidant vitamin supplements in amounts exceeding the RDA has not been established in people with MS and there is a theoretical risk that these vitamins may stimulate the immune system, which is already overactive in MS.

Vitamin C

It is thought that vitamin C may be useful in helping prevent urinary tract infections, which can occur commonly in people with MS. The idea behind this is that vitamin C may help to make urine more acidic, which in turn makes it more difficult for bacteria to colonize the urinary tract. However, evidence indicates that vitamin C does not acidify urine. Therefore, there is some controversy about whether intake of high amounts of vitamin C is beneficial for a person with MS. Evidence does support the use of cranberry (in pill or juice form) to acidify urine and protect against urinary tract infections. Vitamin C can also boost your immune system, which isn’t always a desired effect for those with MS.

Vitamin E

Vitamin E, which is available in vegetables, nuts, meats, vegetable oils, and fruits, prevents oxidative damage in the body. If you are taking polyunsaturated fatty acid (PUFA) supplements or consume a diet high in PUFA, which is thought to be beneficial in MS, your requirements for vitamin E will go up. Before you start increasing PUFA intake, talk to your doctor about how this will increase your need for vitamin E. As with many supplements, too much of vitamin E can cause problems, and some experts recommend people with MS consume lower doses of vitamin E due to unresolved questions about immune effects.

Vitamin A

Vitamin A is an important vitamin for eye health as well as normal cell growth throughout the body. Sources of vitamin A include liver, eggs, and cod liver oil. Vitamin A is a fat-soluble vitamin which is stored in the body and may accumulate over time. Therefore, you should avoid taking too much of this vitamin. If you are pregnant, you should not consume high amounts of vitamin A because intake of excessive amounts of this vitamin may result in birth defects. Pregnant women should limit vitamin A intake to the safer form of the vitamin found in fruits and vegetables called beta-carotene.

Vitamin B6

B complex vitamins, which contain vitamin B6 (pyridoxine), are taken to increase energy. Natural sources of vitamin B6 include many different foods, such as fish (salmon and tuna), vegetables, chicken and pork, beans, and bananas.

Vitamin B12

Claims have been made that vitamin B12 (cobalamin) is an effective treatment for MS. However, there is little evidence to support these claims. Deficiencies in vitamin B12, which can lead to MS-like neurological symptoms, are typically found in only a small number of people with MS. In patients who have low levels of vitamin B12, a supplement should be used. Natural sources for vitamin B12 include meat, poultry, shellfish, eggs, and dairy products.


The mineral selenium has antioxidant effects and sources include legumes, seafood, whole grains, lean meats, and dairy products. Supplementation of the mineral selenium is potentially useful in MS because of the antioxidant properties of this substance. Data from some studies suggests that selenium levels might be lower in people with MS; however, it is unclear whether selenium supplements would benefit those with MS. Given its antioxidant properties, too much selenium may boost the immune system, which is already overactive in people with MS. Selenium can be toxic at high levels, and people with MS should aim to get their selenium from food sources.


Adequate intake of calcium, which is the most abundant mineral in the body, is important to maintain the health of bones and teeth, and the regulation of vital body processes. An old hypothesis that high calcium intake (consumption of large amounts of milk or other dairy products) during childhood, with a sudden decrease in consumption at adolescence, can cause MS is not supported by much evidence. Dietary sources of calcium include dairy products, leafy vegetables, and eggs. People with MS are at increased risk for bone loss, so adequate calcium intake is crucial. Calcium taken in excess amounts may result in toxic effects.


Zinc is used in many different processes in the body. There have been few systematic studies of zinc in MS. Results from some studies have shown that people with MS have low levels of zinc, while other studies have shown the opposite. These latter studies have suggested that zinc may work to activate the immune system and that zinc supplementation may worsen MS. High intake of zinc can result in copper deficiency, which may result in MS-like neurologic symptoms.

You can read about herbal supplements and MS here.

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Written by Emily Downward | Last review date: March 2022.