Vitamins To Boost Your Immune System

Vitamins To Boost Your Immune System

Vitamins For Immune System

We have always been advised by our parents, nutritionists, dietitians, and doctors to “eat your rainbow". The reason behind asking us to follow the healthy diet and the so-called “food pyramid”, is to ensure that we receive maximum nutritive value out of the food that we eat.

Currently, the world is facing a crisis due to the outbreak of the Coronavirus (COVID-19) pandemic. People are being urged to follow basic hygiene practices and particularly stay at home to prevent contracting an infection and even spreading it. Special emphasis is also being laid upon the importance of foods and dietary inclusions that support and boost the immune system naturally.

During such difficult times, we must consider ourselves privileged enough to have access to the best possible foods. This article will give you a brief idea about the list of vitamins to boost your immune system so that you can include such foods in your daily diet.

What Are Vitamins?

The word vitamin can be split into two – “vital" “amines". As the same suggests, vitamins are naturally occurring complex, organic compounds necessary for the body in appropriate amounts to carry out biochemical activities within the body.

Vitamins are divided into two separate categories;

  1. Water-soluble – Vitamin C and Vitamin B complex
  2. Fat-soluble – Vitamins A, D, E and K

Vitamins play a significant role in promoting the growth and development of the body. Research has also proven that deficiency of vitamins is linked to certain illnesses.

Vitamins along with their important functions are mentioned in the table below;

Sr. NoVitaminFunction
1. Vitamin A ((Retinoids and Carotenoids)


Supports the immune system and inflammatory mediators of cells

Promotes cell growth and development Antioxidant activity

2. Vitamin D (Cholecalciferol)

Formation of bones

It enhances calcium absorption from food and reduces the loss of calcium through urine.

Maintains blood calcium levels

Maturation of white blood cells to promote an immune response

3. Vitamin E (Tocopherols)

Maintains optimal levels of low-density lipoproteins

Strong antioxidant

Prevents oxidative damage to blood vessels due to free radicals

4. Vitamin K

Blood clotting function

Promotes mineralization of bones and strengthens bones

5. Vitamin B1 (Thiamine)Production of energy from the metabolism of fats and carbohydrates
6. Vitamin B2 (Riboflavin)

Essential for iron metabolism (for production of red blood cells)

Recycles Glutathione (an essential antioxidant)

7. Vitamin B3 (Niacin)

Energy production by the metabolism of fats, proteins, and carbohydrates

Strong antioxidant

8. Vitamin B5 (Pantothenic acid)

Energy production from fats, carbohydrates, and proteins.

Supports the immune system

9. Vitamin B6 (Pyridoxine)

Carbohydrate metabolism

Red blood cell production

Detoxification of the liver

Maintains the function of the brain and nervous system

Production of neurotransmitters

10. Vitamin B9 (Folate)

Promotes brain health and cardiovascular health

Regulates homocysteine levels in the blood

Regulates blood pressure and prevents the clotting of blood within the circulation

Important for red blood cell production

11. Vitamin B12 (Cobalamin)

Essential for cardiovascular health

Promotes the production of red blood cells

Regulates blood homocysteine levels

Important cofactor for DNA synthesis

Necessary for aerobic respiration of cells

Promotes bone health

12. Biotin (Coenzyme R, vitamin H, Vitamin B7)Metabolism of sugars and fats

Promotes optimum skin health

13. Vitamin C (Ascorbic acid)

Antioxidant properties

Protects the lens if the eyes

Metabolism of various drugs

Antiviral activity

Production of collagen

Synthesis of some neurotransmitters

Necessary for the synthesis of serotonin – needed or proper functioning of the nervous system, endocrine system, digestive system, and immune system

Serotonin is also essential for mood changes and experiences of pain and stress

List Of Best Vitamins To Boost The Immune System

It is quite evident from the table above that our general health status and optimal functioning of the immune system depends upon an adequate intake of vitamins, which is directly related to the kind of diet that we follow and the type of food that we eat.

Best vitamins which support and boost the immune system are;

1. Vitamin A

Vitamin A derived from animal sources is called retinoid and that from plant sources is called pro-vitamin A carotenoid. During digestion, provitamin A carotenoids are converted into preformed vitamin A retinoids.

Dietary sources of vitamin A

  • Provitamin A carotenoids – Carrots, sweet potatoes, spinach, kale, bell peppers, broccoli, cantaloupe, chili peppers, tomatoes, papaya, eggs, basil, Brussel sprouts, and grapes.
  • Preformed vitamin A – Cheese, yogurt, cow’s milk, eggs, salmon, chicken, lamb

2. Vitamin D

This is the most easily yet inconsistently available vitamin. Exposure of skin for about 10 minutes to the sun converts 7-dehydrocholesterol into cholecalciferol (a preliminary form of Vitamin D). The amount of cholecalciferol produced depends upon the type of skin and skin health, nature of skin pigments and the nature of sunlight.

Since the 1980s, vitamin D deficiency has increased due to an increase in the use of sunscreens and reduced sun exposure due to a sedentary lifestyle.

Vitamin D deficiency is linked to several disorders such as lowered immune function, bronchial asthma, osteoporosis, rickets, diabetes mellitus, rheumatoid arthritis, depression, and epilepsy.

Dietary sources of vitamin D

Eggs, salmon, cows milk, mushrooms, orange juice, and soy milk. Certain foods like milk, cheese, margarine, and oils are being fortified with Vitamin D to meet the daily recommended intake requirements.

3. Vitamin E

Being a potent antioxidant, vitamin E supports the immune system by maintaining cellular functioning and preventing oxidative damage.

Vitamin E deficiency is linked to increased risk of cancer, stroke, cardiovascular diseases, epilepsy, diabetes mellitus, cataract, Alzheimer's disease, and poor immune status.

Dietary sources of vitamin E

Spinach, asparagus, broccoli, bell peppers, kale, avocado, tomatoes, peanuts, olives, carrots, green beans, kiwi, cranberries and raspberries.

4. Vitamin B3

This group of vitamins consists of nicotinamide and nicotinic acid. This vitamin eradicates free radicals and protects the tissues against oxidative damage.

Vitamin B3 deficiency is associated with alcohol and illnesses such as pellagra, osteoarthritis, acne vulgaris, schizophrenia, high cholesterol, and type-1 diabetes.

Dietary sources of vitamin B3

Mushrooms, chicken, bell peppers, tomatoes, sweet potatoes, sunflower seeds, brown rice, green peas, carrots, potatoes, spinach, broccoli, cabbage, cauliflower, eggplant, beetroot

5. Vitamin B6

This vitamin supports the immune system as it influences red blood cell production and also helps in detoxifying the liver. It is a co-factor for different enzymes that carry out basic functions in the body.

Vitamin B6 deficiency is linked to some major diseases like several chronic inflammatory diseases, epilepsy, attention deficit disorder, anemia, premenstrual syndrome, high homocysteine levels, and even depression.

Dietary sources of vitamin B6

Garlic, cabbage, spinach, bell peppers, cauliflower, chicken, broccoli, bananas, sprouts, tomatoes, leeks, green peas, avocados, lentils, turmeric, pineapple, mushrooms, corn, celery, watermelon, strawberries, and fortified cereals.

6. Vitamin B9

Plays a critical role in boosting the immune system by virtue of its different functions mentioned in the table above.

Folate deficiency is linked to an increased risk of cardiovascular disease, neural tube defects in infants, loss of pregnancy or miscarriage, high risk of cancer, hypertension, anemia, ulcerative colitis, psoriasis, decline in cognitive functions and osteoporosis.

Dietary sources of vitamin B9

Spinach, avocado, lettuce, kidney beans, rice, eggs, peanuts, and salmon.

7. Vitamin B12

The daily requirement of vitamin B12 is very minute. It can only be synthesized by microorganisms like fungi – mushrooms. The deficiency of vitamin B12 is quite common as it is difficult to absorb by the body.

Vitamin B12 deficiency is associated with impaired brain health, anemia, osteoporosis, neuropathy, migraine, fatigue, asthma, memory loss, gastritis, Alzheimer's disease, kidney disorders, and multiple sclerosis.

Dietary sources of vitamin B12

Seafood, eggs, cheese, mushrooms, cows milk, chicken and fortified breakfast cereals.

8. Vitamin C

The first nutrient that comes into mind when we speak of immunity is vitamin C. It is found in every tissue of the body except the central nervous system.

Vitamin C boosts immunity against colds, influenzas, and infections by;

  • Increasing phagocytosis (the process by which infective organisms are killed)
  • Enhanced production of white blood cells
  • Aids in the movement of neutrophils and monocytes towards the pathogen.
  • Removes free radicals from the blood which may destroy immune cells

Vitamin C deficiency is linked to the suppressed immune system, weak collagen formation, delayed wound healing and increased susceptibility to infections.

Dietary sources of Vitamin C

Orange, lemon, tomatoes, cabbage, bell peppers, and green peas.

Adequate intake of vitamins to boost the immune system are also mandatory for maintaining overall health. All the important vitamins for the immune system can be easily obtained from fruits, vegetables, nuts, seeds, grains, and cereals.

Vitamins aid the body to fight against infections and protect the cells against damage. These vitamins also promote, enhance and regulate the immune system. The vitamins mentioned above are also frequently available in the form of supplements by prescription from a qualified medical practitioner.


Dr. Himanshi Purohit

Dr. Himanshi is a Homeopathic consultant currently working as a lecturer in Post-graduate faculty of Homeopathy, Parul University, Vadodara.