COVID-19: the most effective dietary supplements

Coronaviruses are a family of viruses that infect various hosts, causing mild to severe respiratory illnesses. SARS-CoV-2, responsible for COVID-19, is distinguished by its high transmissibility and its ability to cause severe forms of pneumonia, which led to a global pandemic. Transmission of SARS-CoV-2 occurs mainly via respiratory droplets and aerosols emitted when coughing, sneezing, or even speaking, and by direct contact with contaminated surfaces.rnrnSARS-CoV-2 infects the body by primarily targeting respiratory cells via the ACE2 protein (angiotensin-converting enzyme 2). The virus binds to ACE2 receptors, fuses with the host cell, enters and releases its RNA to replicate, causing damage to lung tissue. This process triggers a significant inflammatory response, often called a 'cytokine storm', which can cause widespread inflammation and damage organs.rnrnSARS-CoV-2 also affects red blood cells by reducing their ability to transport oxygen effectively, exacerbating respiratory symptoms and causing hypoxia (low oxygen levels). rrnThese phenomena underlie severe symptoms such as respiratory distress and systemic inflammation in organs like the kidneys, the heart and even the brain.

Symptoms and Complications

COVID-19 can present with a dry cough, fever, fatigue, headaches and muscle aches. In some cases, severe symptoms such as difficulty breathing and decreased oxygen saturation may occur. rrnOne particularly concerning aspect of the disease is 'long COVID', where symptoms persist for several months after the initial recovery. Patients report chronic fatigue, cognitive impairment, and sometimes a reduced sense of smell. Research has also identified alterations in endothelial cells and the gut microbiota.

At-Risk Populations

Older adults, particularly those over 65, have an increased risk of developing severe forms of COVID-19 due to the natural weakening of the immune system associated with age. Younger adults with underlying conditions such as diabetes, heart disease, obesity, and chronic respiratory diseases are also more likely to suffer serious complications. Immunocompromised individuals, or those receiving immunosuppressive treatments (for example, for organ transplants), are particularly vulnerable.rnrnFurthermore, some studies highlight that deficiencies in essential nutrients, such as vitamin D and zinc, can impair the immune response and thereby worsen disease severity​.

Prevention and Natural Approaches

Strengthening immunity against COVID-19 relies on several natural approaches, combining micronutrients, plants and probiotics whose effectiveness is supported by clinical studies. An essential first step is to assess and correct deficiencies in vitamin D, a key immunomodulatory nutrient. rnrnVitamin C complements this effect thanks to its antioxidant properties and its support of the immune response against respiratory infections. Zinc may reduce the severity of COVID-19 due to its antiviral and anti-inflammatory effects and its role in maintaining epithelial integrity.rnrnOmega-3s play an essential role; by acting on cytokine signaling, they may attenuate inflammatory reactions. Selenium may play a protective role due to its ability to reduce inflammatory lung damage observed in viral infections like influenza, which suggests potential relevance in COVID-19.rnrnProbiotics are of particular interest in this context. Research emphasizes the importance of gut health, noting that 70% of immunity is linked to the gut microbiota. Studies show that certain strains, such as Lactobacillus plantarum and Lactobacillus brevis, prevent epithelial cell infections and restore the microbiota, which is essential for supporting innate immunity and reducing the risk of inflammation.rnrnFinally, polyphenols, found in green tea, turmeric and berries, reduce markers of inflammation such as C-reactive protein and interleukin-6 (IL-6), involved in the inflammatory reactions observed in COVID-19, and also strengthen the body's resistance to oxidative stress.