Chennai: Several months into the pandemic, experts have now said that there is a definite connect between Vitamin D, the ‘sunshine vitamin’, and the immune response to the coronavirus.
Stressing that Vitamin D is inexpensive and has negligible risk when compared to the considerable risk of Covid-19, global researchers on the disease have asked governments to make it part of their strategy against the novel coronavirus, reports said.
Prof Afrozul Haq, former dean of the School of Interdisciplinary Sciences and Technology (SIST) at New Delhi’s Jamia Hamdard University, has said that even though many factors such as age, being male and comorbidities are known to predispose individuals to higher risk from exposure to SARS-CoV-2, inadequate Vitamin D is by far the ‘most easily and quickly modifiable risk factor with abundant evidence to support a large beneficial effect’.
Prof Afrozul Haq is one of the 170 experts who earlier this month wrote an open letter on the matter.
Calling for immediate widespread increased Vitamin D intake, the letter posted on the website vitamindforall.org states that “research shows low vitamin D levels almost certainly promote Covid-19 infections, hospitalisations, and deaths”.
“This campaign group of Vitamin D and Covid-19 researchers, including myself, started the process to write this letter for the purpose to make all aware about the benefits of Vitamin D supplementation in Covid-19 infected patients and sending this letter to all health ministries, healthcare workers, governmental bodies and NGOs,” Haq said.
According to the letter, which had 171 signatories by Wednesday, evidence suggests the possibility that the Covid-19 pandemic sustains itself in large part through infection of those with low Vitamin D and deaths are concentrated largely in those with deficiency.
The mere possibility that this is so should compel urgent gathering of more vitamin D data. Even without more data, the preponderance of evidence indicates that increased vitamin D would help reduce infections, hospitalisations, ICU admissions and deaths, it said.
As debate on the matter escalated, immunologist Vineeta Bal added a note of scepticism, noting that most of the experts are based in developed countries where Vitamin D daily supplementation may be feasible, practical and affordable.
“If individuals are heavily deficient, supplementation as recommended in the letter is likely to take weeks or months to achieve desirable levels of Vitamin D in the serum,” she said.
“Not just Vitamin D, other vitamins and micronutrients such as zinc have also shown beneficial effects,” she explained.
According to Professor Srijit Mishra, another signatory to the letter, the recommendation is Vitamin D intake for adults of up to 4,000 international Units (IU) or 100 microgrammes (mcg) daily. Those at an increased risk of deficiency due to excess weight, dark skin, or living in care homes may need higher intakes.
“The current evidence suggests that 25-hydroxyvitamin D serum levels over 30 nanograms per millilitre (ng/ml), a test to measure Vitamin D level is a widely endorsed minimum to reduce Covid-19 risk,” Mishra, from Mumbai’s Indira Gandhi Institute of Development Research (IGIDR), said.
While no clinical trials have tested Vitamin D’s efficacy as a treatment or a preventive measure, several studies have found an association between low levels of Vitamin D and Covid-19.