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7 Health Benefits of Vitamin A, Evidence Based

Vitamin A is the unsung hero for the immune system, eye health, and much more. As far as immunity goes, many people automatically reach for vitamin C and vitamin D, but forget about the power of vitamin A.

While vitamin D and C are also crucial to improve the function of the immune system, vitamin A is as well. Vitamin A is a micronutrient that protects the epithelium and mucous membranes in the body (1). It even can have a therapeutic effect on the healing of infectious diseases.

Vitamin A Benefits

It acts as an anti-inflammatory agent, which makes it crucial at enhancing immunity. This micronutrient also plays a significant role in cellular immune responses.

Vitamin A is fat-soluble, so too much can build up in the body. However, it is rare to get too much vitamin A from food alone. If you take in too much vitamin A, it would be through supplementation.

Health Benefits of Vitamin A

Vitamin A is a micronutrient that helps to carry out many functions in the body. Find out the many health benefits of vitamin A and how it can specifically help many bodily functions below.

1. Improves Vision

Improving vision is one of the pertinent health benefits of vitamin A. It not only improves vision health overall, but it can also prevent the chances of developing age-related macular degeneration (2). Age-related macular degeneration causes significant vision loss for the elderly.

It is vital to understand that the more vitamin A you get does not mean it is necessarily better. Too much vitamin A can cause just as much harm as too little.

A few other vitamins are also essential in combination with vitamin A to improve vision and prevent macular degeneration later in life. These vitamins include vitamins C and E. They show to be the most beneficial at reducing the chances of macular degeneration, even if it runs in your family.

Try not to get too focused on family diseases. There is promising hope in the field of epigenetics that shows that even if a disorder runs in your family, it does not mean you will inherit it. Epigenetics states that you may have the power to change your gene expression (3).

 

If you use the tools of lifestyle change and food, you have a much higher chance of avoiding disease.

2. Necessary for Reproduction

Another essential role of vitamin A is through reproduction. Pregnant women need to get a healthy amount of vitamin A to help prevent complications.

Premature infants are at a high risk of being deficient in vitamin A, along with young children, mostly in developing countries.

That is mostly because mothers in developed countries typically have enough vitamin A in their breastmilk, while other poorer countries may not (4).

Pregnant women require more vitamin A to help the fetus fully develop. If you are pregnant, make sure you are getting adequate amounts of vitamin A in your diet and through a prenatal vitamin.

3. Boosts Immunity

Many automatically think of vitamin C for immunity, but vitamin A is just as essential to keeping your immune system strong and healthy.

Vitamin A protects mucous membranes and many tissues throughout the body. It is a necessary micronutrient to make sure your immune system is always functionally well.

When your immune system is healthy and functioning well, your chance of developing colds, viruses, and other illnesses can drastically decrease.

You can get all the vitamin A you need from a healthy balanced diet, but supplementing vitamin A in a multivitamin can also be beneficial for some.

One thing to keep in mind with keeping Vitamin A levels high is that it may be better absorbed when taken with vitamin E. So if you are low in either nutrient, try to space out doses for maximum availability and absorption.

4. Prevents Measles

While measles does not usually affect developed countries as much lately, measles can be a contributor to death in developing countries. Vitamin A deficiency is a contributor to those who have measles (5).

If children develop measles, the World Health Organization recommends taking oral supplementation of 60,000 mcg for a few days to bring their levels back up. That dosage can significantly reduce the risk of mortality among children in developing countries.

In areas like the United States, research is lacking about the connection between vitamin A and measles. However, severe vitamin A deficiency is known to cause measles.

Children that get measles are not only at risk of that but because they are low in vitamin A, symptoms can lead to blindness from malnutrition.

Vitamin A is a crucial micronutrient that needs to stay at adequate levels to prevent measles, as well as blindness that can ensue as well.

5. Can Lower Risk of Lung Cancer

Vitamin A can also play a role in reducing the risk of lung cancer.

In one study, smokers and nonsmokers showed lower rates of lung cancer in those that ate more vitamin A-rich foods (6). Participants with lower chances of lung cancer ate more foods high in carotenoids from many different fruits and vegetables.

The reason vitamin A can help to lower the risk of lung cancer is due to the protective nature it can have on lung tissue. It can also help to slow the development or progression of pulmonary disease (7).

There is also some research on how vitamin A can significantly benefit the complex process of separation of pulmonary tissue.

Respiratory disease and lung cancer are rampant across the globe, affecting millions of people every year. Eating a healthy balanced diet is the first step to preventing disease, including lung cancer. Another crucial step is to quit smoking, pay attention to your environmental toxins as much as possible, and examine other lifestyle factors that can negatively affect your health.

6. Maintain a Healthy Heart

The power of vitamin A ranges far beyond eye health. The heart is another organ that can benefit from a regular dose of vitamin A.

Vitamin A is necessary for overall development, and the heart is a part of that. Many studies show that plays a direct role in heart formation during several stages (8).

These findings can help to decrease the risk of cardiovascular complications in newborns as well as problems that may develop for them later in life.

There is some evidence that the heart can react to vitamin A, but more research is necessary for this area. In another study, lowering the amount of this vitamin altered how the heart maintained itself (9).

Vitamin A can play a significant role in heart health, and the prevention of heart defects and disease, but more research may be necessary to assert a total claim for it.

7. Can Lower Risk of Prostate Cancer

Many observational studies show a possible connection between a lower risk of prostate cancer and eating more foods high in vitamin A. More research is necessary for this, though.

Lycopene is a carotenoid that gives many fruits and vegetables their color, like tomatoes, watermelon, and guava. All these foods are also high in vitamin A. Carotenoids can be changed into vitamin A in the body, and they can be a powerful antioxidant against cancer (10).

There can be a connection to eating more vitamin A-rich foods and preventing prostate cancer. Many other vitamin-rich, nutrient-dense foods are necessary to help prevent prostate cancer, too. These include vitamin E, selenium, calcium, vitamin D, and more.

Eating a healthy diet is always the right choice to avoid prostate cancer. Remember that vitamin A protects and strengthens the immune system, so it can never hurt to add more of it through food.

Where to Get Vitamin A from Food?

There are many different foods that are high in vitamin A. Check out the list below to see where you can start adding more vitamin A to your diet.

Foods high in vitamin A include:

  • Guava
  • Watermelon
  • Tomatoes
  • Red bell pepper
  • Eggs
  • Cod liver oil
  • Fortified breakfast cereal
  • Beef liver
  • Fish
  • Dairy-Many types of cheese
  • Poultry
  • Carrots
  • Sweet potatoes
  • Many other orange and yellow fruits and vegetables

There are a plethora of vitamin A-rich foods you can start adding to your diet to boost eye health, enhance your immune system, prevent many types of cancer, maintain a healthy heart, and more.

Be sure to add more of these foods to your diet to reap all the health benefits from vitamin A.

Potential Health Risks from Too Much Vitamin A

Vitamin A is a fat-soluble vitamin, which means it builds up in the body over time if you take too much. It is almost impossible to get too much vitamin A from food alone. Overdose can potentially happen when you take too many vitamin A supplements or too high of a dosage.

The potential health risks from taking too much vitamin A through supplementation include:

  • Blurry vision, or other vision problems
  • Nausea
  • Vomiting
  • Sensitivity to light
  • Dry skin

Too much vitamin A through supplementation is not a good idea for these reasons and more. Too much vitamin A can also potentially interfere with vitamin D in the body.

The recommended daily intake of vitamin A is 900 mcg for adult men and 700 mcg for adult women. Pregnant women require more vitamin A so the fetus can fully develop without complications.

The upper limit of vitamin A is 3,000 mcg per day, but that is typically not ideal daily unless otherwise prescribed by a doctor. A small amount of vitamin A in a multivitamin likely will only help. Just be sure not to exceed the recommended dosage regularly.

Conclusion

Vitamin A is a crucial micronutrient that the body needs to maintain eye health, a healthy heart, better skin, and it can even help to prevent some cancers.

There are many foods you can start to include in your diet if you feel you are not getting enough vitamin A.

This vitamin is typically safe for many to consume daily through food and lower supplement dosages.

Be sure to include plenty of vitamin A-rich food in your diet to get all the health benefits from this potent micronutrient.

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Evidence Based

This article is based on scientific evidence, and written, fact-checked & medically reviewed by health experts.

Throughout this article, you'll find scientific references (clickable links to highly trusted peer-reviewed scientific papers, links denoted by the numbers in the parentheses (1, 2, 3)).