High Dose of Vitamin D Fails to Improve Condition of Moderate to Severe COVID-19 Patients
High Dose of Vitamin D Fails to Improve Condition of Moderate to Severe COVID-19 Patients
SHARE: READ: 549     13:08     05 May 2021    
A clinical trial was conducted with 240 patients who were given 200,000 IU of vitamin D3 on admission to hospital. The supplementation did not reduce length of stay or affect the proportion requiring intensive care. Can a high dose of vitamin D administered on admission to the hospital improve the condition of patients with moderate or severe COVID-19? The answer is no, according to a Brazilian study published in the Journal of the American Medical Association (JAMA). The article reports a randomized, double-blind, placebo-controlled clinical trial, the kind of study considered the gold standard to evaluate drug efficacy. It was conducted with FAPESP’s support by researchers at the University of São Paulo’s Medical School (FM-USP), who recruited 240 patients treated at Hospital das Clínicas (HC), the hospital complex run by FM-USP, and the Ibirapuera field hospital in São Paulo City in June-August 2020. “In vitro studies or trials with animals had previously shown that in certain situations vitamin D and its metabolites can have anti-inflammatory and anti-microbial effects, as well as modulating the immune response. We decided to investigate whether a high dose of the substance could have a protective effect in the context of an acute viral infection, reducing either the inflammation or the viral load,” Rosa Pereira, principal investigator for the project, told Agência FAPESP. The volunteers were randomly divided into two groups, one of which was given vitamin D3 in a single dose of 200,000 units (IU) dissolved in a peanut oil solution. The other group was given only the peanut oil solution. All participants were treated according to the standard protocol for hospital treatment of the disease, which includes administration of antibiotics and anti-inflammatory drugs. The main purpose was to see if acute supplementation would affect the length of hospital stay for these patients, but the researchers also wanted to find out whether it would mitigate the risks of admission to the intensive care unit (ICU), intubation and death. No significant difference between the groups was observed for any of these clinical outcomes. According to Pereira, the study was designed above all to assess the impact on hospital stay and a larger number of volunteers would be needed to achieve a scientifically acceptable estimate of the effect on mortality. “So far we can say there’s no indication to administer vitamin D to patients who come to the hospital with severe COVID-19,” she said. For Bruno Gualano, a researcher at FM-USP and penultimate author of the article, the findings show that at least for now there is no “silver bullet” for the treatment of COVID-19. “But that doesn’t mean continuous use of vitamin D can’t have beneficial effects of some kind,” he said. Ideal dose Pereira is currently leading a study at FM-USP to find out whether subjects with sufficient circulating levels of vitamin D combat infection by SARS-CoV-2 better than those with insufficient levels of the nutrient. The ideal level of vitamin D in the blood and the daily supplementation dose vary according to age and overall health, she explained. Older people and patients with chronic diseases including osteoporosis should have more than 30 nanograms per milliliter of blood (ng/mL). For healthy adults, 20 ng/mL is an acceptable threshold. “The ideal approach is case-by-case analysis, if necessary dosing the substance periodically by means of blood work, with supplementation if a deficiency is detected,” Pereira said.
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