Everyone has become health conscious, looking for ways to boost immunity in this time of a global coronavirus pandemic.

The best way to boost your immunity is to go on a whole food, low sugar diet.  The more nutrient dense foods you can get in on the daily, the better. There are five significantly potent immune boosting nutrients that will give your body an extra wall of defense. 


Zinc is a well-loved mineral in the immunity world.  It nourishes and supports the innate (first defense) and adaptive immunity (long-term, has memory).  Zinc is a co-factor for over 200 enzymatic reactions within the body, with many of these being immune dependent mechanisms.  It supports the thymus gland in adaptive T-cell production/regulation and acts as a free-radical scavenger. 

We love zinc as it supports against viruses and bacterial pathogens and promotes healthy function and integrity for our white blood cells: macrophages, neutrophils, natural killer cells, T-cells and lymphocytes. 

Food Sources:  Pumpkin seeds, sunflower seeds, egg yolks, seafood, oysters, beef

Vitamin C

This is probably your go-to nutrient when it comes to immune boosting superstars, and all for the right reasons!  Vitamin C (ascorbic acid) is one of the bodies most essential antioxidants, and unfortunately we need to get it from external sources. 

Vitamin C has shown to significantly strengthen the body’s immunity, particularly during times of stress and infections.  White blood cells have high concentrations of vitamin C that are essential to all levels of defense against free radicals, pathogens and inflammation. 

It helps to upsurge white blood cells (first defense and adaptive) communication, durability and pathogen killing abilities! Even better, if you have those nasty lymphatic inflammatory conditions, vitamin C contains substantial detoxification and anti-inflammatory properties.  This is a great nutrient to have on hand for viruses, bacterial infections – especially for systemic or respiratory conditions.

Food Sources:  green leafy vegetables, citrus fruits, kiwis, papaya, strawberries, mango, red peppers, and cabbage.

immunity boost
Kiwis and strawberries are some fruits that are high in Vitamin C.

Vitamin A

Vitamin A comes in many different molecular structures, retinyl palmitate is one of the most abundant forms and retinyl esters are found mainly in animal products such as: eggs, liver, fish oils, milk and butter.  Plants provide us with the precursors to Vitamin A in a carotenoid form, this proceeds to further biochemical reactions to make Vitamin A. 

Furthermore, plant sources are mainly found in orange coloured fruits or vegetables and dark green leafy vegetables. These include papaya, squash, carrots, spinach, broccoli, sweet potatoes, kale, and pumpkin

Carotenoids have potent antioxidant effects in the body and can also improve our immunity by nourishing our white blood cells and lymphatic detoxification.  Vitamin A is excellent for skin and gut integrity, which is our first line of defense from the exterior pathogenic world. 

Vitamin D

This is best sourced from UV sunlight, it is obtained through 2 pathways: activation within the skin and through the diet.  In fact, if you receive adequate levels of sunlight, usually you would not need to supplement vitamin D. 

Unfortunately, many of us live in rather gloomy climates where supplementation is vital.  Vitamin D significantly regulates immunity and to support auto-immune conditions.   This wonderful fat-soluble vitamin also enhances the first defense system mechanisms against pathogens and improve our immune systems; targeting, natural killing and detoxification processes.

Vitamin D is another nutrient generally sourced by animal products: eggs, liver, fatty fish, and butter.

immunity boosting foods
Eggs are rich in selenium.


Selenium is an essential trace element found in high quantities within immune tissues such as the spleen and lymphatics. It regulates innate and adaptive immunity, particularly against virulence of viruses, sometimes these can be harmless but without sufficient selenium, they can mutate into more powerful and detrimental forms. 

Additionally, selenium can improve antigen response times and increase natural killer production. Selenium supplementation can also improve lymphatic detoxification, reduce abnormal cell mutations, increase white blood cell response/structural integrity and can improve illness recovery duration.

Food sources:  brazil nuts, alfalfa, organic meats/eggs, onion, garlic and broccoli.

Extra tips for nutrient immune support

  • Make a batch of organic bone broth and drink 1 to 2 cups per day
  • Add in an extra nutrient dense super green juice. A good combinations is kale, turmeric, ginger, lemon, cucumber and celery.
  • Ensure you’re getting 2 laters of filtered water per day
  • Have one source of probiotic rich foods per day. Sauerkraut, kimchi, kefir, miso soup or yoghurt are all good sources of probiotics. If these foods are difficult to fit in, take a good quality probiotic.

Dietary exclusions:

  • Caffeine
  • Preservatives, additives and food colorings
  • Processed foods (think anything in a packet)
  • Sugar/overconsumption of fruits

Text by Renee Grandi, Nutritionist and Naturopath at Chiva-Som.

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