Can vitamin D lower your risk of COVID-19?

Vitamin D is a fat-soluble vitamin that plays a number of critical roles in your body.

This nutrient is especially important for immune system health, leaving many people wondering whether supplementing with vitamin D may help reduce the risk of contracting the new coronavirus that causes COVID-19.

While there’s currently no cure for COVID-19, preventive measures like physical distancing and proper hygiene can protect you from contracting the virus.

Also, some research shows that having healthy levels of vitamin D can help keep your immune system healthy and may protect against respiratory illnesses in general.

A recent study indicated that patients hospitalized with COVID-19 who had sufficient levels of vitamin D had a decreased risk for adverse outcomes and death.

How does vitamin D affect immune health?

Vitamin D is necessary for the proper functioning of your immune system — which is your body’s first line of defense against infection and disease.

This vitamin plays a critical role in promoting immune response. It has both anti-inflammatory and immunoregulatory properties, and is crucial for the activation of immune system defenses.

Vitamin D is known to enhance the function of immune cells, including T cells and macrophages, that protect your body against pathogens.

In fact, the vitamin is so important for immune function that low levels of vitamin D have been associated with increased susceptibility to infection, disease, and immune-related disorders.

For example, low vitamin D levels are associated with an increased risk of respiratory diseases, including tuberculosis, asthma, and chronic obstructive pulmonary disease (COPD), as well as viral and bacterial respiratory infections.

What’s more, vitamin D deficiency has been linked to decreased lung function, which may affect your body’s ability to fight respiratory infections.

Can taking vitamin D protect against COVID-19?

Currently, there’s no cure or treatment for COVID-19, and few studies have investigated the effect of vitamin D supplements or vitamin D deficiency on the risk of contracting the new coronavirus, SARS-CoV-2.

However, a recent study has determined that a blood level of 25-hydroxyvitamin D of at least 30 ng/mL seemed to help reduce the likelihood of adverse clinical outcomes and death in hospitalized patients with COVID-19.

Hospital data of 235 patients with COVID-19 were analyzed.

In patients older than age 40, those who had adequate levels of vitamin D were 51.5% less likely to have adverse outcomes, including becoming unconscious, hypoxia, and death, as compared to vitamin D-deficient patients.

Still, other studies have shown that vitamin D deficiency may harm immune function and increase your risk of developing respiratory illnesses.

Additionally, some studies have indicated that vitamin D supplements can enhance immune response and protect against respiratory infections overall.

A recent review that included 11,321 people from 14 countries demonstrated that supplementing with vitamin D decreased the risk of acute respiratory infections (ARI) in both those who had deficient and adequate levels of vitamin D.

Overall, the study showed that vitamin D supplements reduced the risk of developing at least one ARI by 12%. The protective effect was strongest in those with low vitamin D levels.

Moreover, the review found that vitamin D supplements were most effective at protecting against ARI when taken daily or weekly in small doses and less effective when taken in larger, widely spaced doses.

Vitamin D supplements have also been shown to reduce mortality in older adults, who are most at risk of developing respiratory illnesses like COVID-19.

What’s more, vitamin D deficiency is known to enhance a process known as the “cytokine storm”.

Cytokines are proteins that are an integral part of the immune system. They can have both pro-inflammatory and anti-inflammatory effects and play important roles, helping protect against infection and disease.

However, cytokines can also induce tissue damage under certain circumstances.

A cytokine storm refers to the uncontrolled release of pro-inflammatory cytokines that takes place in response to infection or other factors. This dysregulated and excessive release of cytokines leads to severe tissue damage and enhances disease progression and severity.

In fact, it’s a major cause of multiple organ failure and acute respiratory distress syndrome (ARDS), as well as an important factor in the progression and severity of COVID-19.

For example, patients with severe cases of COVID-19 have been shown to release large numbers of cytokines, particularly interleukin-1 (IL-1) and interleukin-6 (IL-6).

Vitamin D deficiency has been associated with reduced immune function and may enhance the cytokine storm.

As such, researchers postulate that a vitamin D deficiency may increase the risk of severe COVID-19 complications, as well as that vitamin D supplementation may reduce complications related to cytokine storms and uncontrolled inflammation in people with COVID-19.

Currently, multiple clinical trials are investigating the effects of vitamin D supplementation (at dosages up to 200,000 IU) in people with COVID-19.

Although research in this area is ongoing, it’s important to understand that taking supplemental vitamin D alone can’t protect you from developing COVID-19.

However, being deficient in vitamin D may increase your susceptibility to overall infection and disease by harming immune function.

This is especially worrisome given that many people are deficient in vitamin D, especially older individuals who are most at risk of developing serious COVID-19-related complications.

For these reasons, it’s a good idea to have your healthcare provider test your vitamin D levels to determine whether you have a deficiency in this important nutrient. This is particularly important during winter months.

Recommendations from the US Institute of Medicine (IOM) suggest that an average daily intake of 400–800 IU (or 10–20 micrograms) is adequate for 97.5% of individuals. However, those with low blood levels will often require much higher doses to increase their levels to an optimal range. A daily vitamin D intake of 1,000–4,000 IU (or 25–100 micrograms) should be enough to ensure optimal blood levels in most people. 4,000 IU per day is the safe upper limit according to IOM. Make sure not to take more than that without consulting with a health professional.

Though recommendations on what constitutes an optimal vitamin D level vary, most experts agree that optimal vitamin D levels lie between 30–60 ng/mL (75–150 nmol/L).


Vitamin D plays many important roles in your body, including promoting the health of your immune system.

Scientific research suggests that supplementing with vitamin D may protect against respiratory infections, especially among those who are deficient in the vitamin.

Recent research indicates that sufficient vitamin D levels may help people with COVID-19 avoid adverse outcomes.

Still, we don’t know whether taking vitamin D supplements reduces your risk of developing COVID-19 as a result of contracting the coronavirus.

Talk to your doctor about supplementing with vitamin D to enhance your overall immune response.

Source: HealthLine


Stellapharm is one of leading generics pharmaceutical companies and strong producer of anti-viral drugs in Vietnam. The company established in Vietnam in 2000; and focuses on both prescription drugs and non-prescription especially in cardiovascular diseases, antiviral drugs, anti-diabetics drugs, etc. and our products are now used by millions of patients in more than 50 countries worldwide.

The company is globally recognized for its quality through our facilities have been audited and approved by stringent authority like EMA, PMDA, Taiwan GMP, local WHO and others.

Additional information for this article: Stellapharm J.V. Co., Ltd. – Branch 1
A: 40 Tu Do Avenue, Vietnam – Singapore Industrial Park, An Phu Ward, Thuan An City, Binh Duong Province, Vietnam
T: +84 274 376 7470 | F: +84 274 376 7469 | E: | W:

You May like

30 Nov 2022

Lão hóa miễn dịch và cách chống lại tình trạng này

Theo tuổi tác, hệ miễn dịch của chúng ta trở nên kém hiệu quả hơn trong việc đối phó với các tình trạng nhiễm trùng cũng như kém đáp ứng với việc chủng ngừa. Đồng thời, hệ miễn dịch lão hóa có mối liên hệ với tình trạng viêm mạn tính, từ đó làm tăng

30 Nov 2022


With age, the human immune system becomes less effective at tackling infections and less responsive to vaccinations. At the same time, the aging immune system is associated with chronic inflammation, which increases the risk of almost all conditions linked to old age. The good news is that exercising and adopting the right diet may help