A Mayo Clinic Doctor’s Advice Part 1: Supplements to Stay Healthy During a Crisis

COVID-19, Diet, health Supplements, Dietary Habits, Vitamin, Hygiene

A Mayo Clinic Doctor’s Advice Part 1: Supplements to Stay Healthy During a Crisis

Dear friend,

Like many of you, I have never witnessed such a time of global duress, pain, and fear as unleashed by the COVID-19 pandemic. Yet at the same time, I also see the undeniable powers of awe and inspiration. 

In a word: Hope.

You are the hope. People provide hope in times of crisis. 

Nurses and first responders put themselves at risk every day in hopes of saving their patients from the virus. They're joined by respiratory technicians, doctors, and staff who interact with patients or sanitize rooms to reduce viral spread.

Frontline workers are like rays of hope – rising to meet the demands that each day presents. You do so with tremendous courage. You work while a storm rages around you, even if it means risking your own lives.

Hope is also being upheld by everyone who is helping maintain society by working at grocery stores, delivery services, gas stations, and more. We are all being called on to do our part, which includes staying at home to wait out the storm. 

We will persevere because of the bravery and dedication of people like you, and we thank you.

In the moments between the strenuous demands at work, or while sheltering at home, there are things you can do to support your immunity and resilience. In this series of five articles, I will include the latest research on daily habits and tactics that support the immune system and increase resilience, including: 

Supplementation:  Dietary supplements (vitamins, minerals and botanicals) that support the immune system.

Stress management:  Quick and easy stress management techniques that can improve your wellbeing. 

Sleep: Tips that can improve your quality of sleep.

Diet: Foods that provide vital nutrients during times of stress. 

Physical activity: Exercises that boost your immune system and reduce inflammation.

During this time, it's important to take care of yourself, as well as others. I hope you find this information helpful and that you, and yours, remain safe.

In health,

Dr. Bauer

Part One: Supplements for immune system support

Research on the health benefits of dietary supplements is constantly progressing. Here's a roundup of dietary supplements that, according to the latest research, can help support your immune system.*


If there was a super mineral, then zinc would be a contender. It's essential to your body's growth and development, wound healing, protein synthesis, and gene expression.* If that's not enough, zinc helps regulate immune function, exhibits antioxidant activity, and helps support a balanced inflammatory response in your body.*1 

Your immune system needs zinc to function properly.* In fact, it seems that every immunological event is influenced by zinc,* making the immune system especially susceptible to changes in zinc levels.2 

A deficiency of zinc can depress the body's immune responses.* A zinc deficiency reduces your ability to eliminate pathogens, mount a response against threats, and produce antibodies.*2,3 One study in the elderly found that even a marginal zinc deficiency in this population adversely impacted immune function.*4

Numerous studies illustrate how zinc benefits many health conditions.*5,6 And there's evidence to support why individuals take a zinc lozenge or syrup when they feel a cold coming on.*5-7 However, be very cautious of using intranasal zinc – it’s linked to a loss of the sense of smell, in some cases long-term or permanently.7 

Zinc is considered an essential nutrient, meaning your body can't produce or store it. Good sources of zinc include red meat, poultry, beans, nuts, certain types of seafood (crab, oysters, and lobster), whole grains, and dairy products. Oysters are by far the best source of zinc – with 32 milligrams in six medium-sized oysters. Don’t like oysters? You can always try a zinc supplement.

Vitamin D

Although best known for its role in maintaining healthy bones, recent research indicates that vitamin D plays an important role in supporting cardiovascular health and the health of the immune system.* 

Vitamin D enhances the function of immune cells, including T-cells and macrophages, which protect your body against invading pathogens.*8 In a 2017 review of 25 clinical studies on vitamin D, a consortium of reviewers analyzed data collected from 11,000 adults. Reviewers found that daily or weekly supplementation of vitamin D2 or vitamin D3 reduced the risk of acquiring a respiratory tract health issue by about 12 percent.* Supplementation was even more beneficial for individuals who were vitamin D deficient – reducing their risk by about 42 percent.*9

Multiple studies have shown that a vitamin D deficiency can harm immune function and increase the risk of developing illnesses.*10 It's estimated that approximately 40 percent of adults in the United States are deficient in vitamin D.11 

Vitamin D is a fat-soluble vitamin that is not found naturally in many foods, but is added to some foods like milk and cereal. It is found naturally in fatty fish such as salmon, mackerel, and sardines. Called the “sunshine vitamin,” your body also manufactures vitamin D when your skin is exposed to sunlight.

The sun’s ultraviolet B (UVB) rays interact with a protein called 7-DHC in the skin, converting it to vitamin D3. Vitamin D then goes through steps in the liver and kidneys for its final activation. Individuals who do not have access to sunshine, such as those living in northern latitudes, people who work at night and sleep during the day, darker-skinned individuals, or elderly shut-ins are particularly susceptible to low vitamin D levels. As you might imagine, vitamin D levels tend to be lowest at the end of winter. How optimal are your vitamin D levels? 

You can test your vitamin D levels in the comfort of your own home with this easy Vitamin D Test.

Vitamin C

Although perhaps best known for its antioxidant properties, vitamin C (ascorbic acid) also supports your immune function.* 

Vitamin C accumulates in several types of cells in your immune system. These cells need vitamin C to perform their tasks.*12 What's more, vitamin C levels in plasma and white blood cells rapidly decline during infections and when your body is stressed.*13  

Additional research shows that being deficient in vitamin C results in a reduced resistance against certain pathogens, while a higher supply enhances several immune system functions.*12  

Vitamin C is a water-soluble vitamin mainly found in fruits and vegetables. Unlike many animals, the human body can’t manufacture ascorbic acid, so your body’s vitamin C must be acquired from the food you eat or through supplements.


Curcumin, the primary active ingredient in turmeric, is a potent antioxidant.* There have been multiple studies on the relationship between curcumin, normal inflammatory responses, and the body's immune functions.*14,15 

A recent review of research studying curcumin's effects on human health suggests that curcumin helps support a balanced inflammatory response throughout the body.*

Studies show that curcumin blocks a biological process, called transcription factor NF-?B, that regulates a large array of genes involved in immune and inflammatory responses.* Any agent that beneficially impacts this regulatory process has the potential to provide support for individuals with several health conditions.*15 

The study also concluded that curcumin improves markers of oxidative stress.*15 Oxidative stress is an imbalance of too many free radicals in relation to antioxidants in the body, which can lead to cell and tissue damage, including the lungs.* In addition to loading up your curry or tikka masala with turmeric, you can also consider a curcumin supplement.


Astragalus refers to a genus of plants that has a long history in Traditional Chinese Medicine. And for good reason. 

Astragalus has plenty going for it in the realm of nutrition. It is a rich source of polysaccharides and flavonoids. Polysaccharides are vital to the body in that some help store the energy we get from food, while others help with cell structure.* Flavonoids are powerful antioxidants with immune system benefits.* In addition, Astragalus contains multiple trace minerals and amino acids.16 

One research study suggests that taking an oral Astragalus extract supports the immune system by increasing the activity level and number of immune cells.*16 In most preparations, the root of the Astragalus plant is used to create a tea, liquid extract, or powder in a capsule.17 


Quercetin is an antioxidant flavonoid found in foods such as onions, berries, teas, and red wine. It is also found in several herbs, including American elderberry. 

The benefits of quercetin likely stem from its strong antioxidant activity.*18 Research suggests that quercetin helps support a balanced inflammatory response in the respiratory tract, prevents damage caused by oxidative stress from illness, and helps prevent the release of histamine from a certain type of white blood cell called a mast cell.*18  

Be smart about supplementation: Talk to your health-care professional first

Remember, all supplements – including all products labeled as "natural" – can have medication-like effects. Anything potent enough to produce a positive effect is also potent enough to carry risk. So before you take a new dietary supplement, talk to your health-care professional first. This is especially important if you take medications, have a chronic health problem, or are pregnant or breast-feeding.

Read the full five part series

Coming Soon:

Part 2: Science-backed Ways to Manage Stress and Anxiety During a Crisis

Part 3: Diet – Foods that Provide Vital Nutrition During Times of Stress

Part 4: Sleep – Tips that Can Improve Your Quality of Sleep

Part 5: Physical Activity – Exercises that Boost Your Immune System and Reduce Inflammation

An important note: No dietary supplement can diagnose, treat, cure or prevent any disease, including COVID-19. With the ongoing COVID-19 pandemic, it is especially important to understand that no dietary supplement, no diet, and no lifestyle modifications – other than the recommended social distancing and hygiene practices – can prevent you from being infected with the COVID-19 virus. No current research supports the use of any dietary supplement to protect you from being infected with the COVID-19 virus.


by: Thorne

2021-02-28 / Updated on: 2021-07-08

Shares Comments

Related Articles