Nikhil Prasad Fact checked by:Thailand Medical News Team Jul 28, 2026 46 minutes ago
Medical News: Large analysis compares popular supplements used alongside standard COVID care
Researchers from the Clinical School, North Henan Medical University in Xinxiang, Henan, China have conducted one of the largest comparisons to date of nutritional supplements used alongside standard medical treatment for COVID-19. Their findings suggest that while some supplements may influence inflammation and immune responses, only a handful demonstrated measurable benefits, and none should be viewed as a replacement for conventional medical care.
Large international analysis finds vitamin C shows the strongest evidence for reducing COVID-related inflammation among
nutritional supplements
The research reviewed data from 45 randomized clinical trials involving 3,793 COVID-19 patients across 18 countries, comparing a wide range of vitamins, plant compounds, fatty acids, and other nutritional supplements.
Vitamin C stood out in reducing a key inflammation marker
One of the strongest findings involved vitamin C, which significantly lowered levels of interleukin-6 (IL-6), an inflammatory protein strongly linked to severe COVID-19 and the dangerous immune overreaction known as a cytokine storm.
Lower IL-6 levels may help reduce excessive inflammation that damages the lungs and other organs during severe infection. Researchers explained that vitamin C appears to interfere with inflammatory signaling pathways, reducing the production of several inflammatory chemicals while also supporting immune cell function. Laboratory evidence also suggests vitamin C may interfere with some of the biological processes the coronavirus uses to infect cells and replicate, although these findings require further clinical confirmation.
Nanocurcumin boosted immune cell counts
Another promising finding involved nanocurcumin, a highly absorbable form of curcumin derived from turmeric. Patients receiving nanocurcumin alongside standard care experienced significantly higher lymphocyte counts.
Lymphocytes are white blood cells that play a vital role in fighting viral infections. COVID-19 often causes these immune cells to decline, particularly in severe cases. Restoring lymphocyte numbers could help strengthen the body's antiviral defenses during the early stages of illness.
However, researchers cautioned that boosting immune activity is not always beneficial. In patients already experiencing an excessive immune response, stimulating immunity further could potentially worsen inflammation. Careful patient selection would therefore be essential.
Pomegranate juice results raised important questions
One of the more surprising observations involved pomegranate juice. The analysis found it was associated with an increase in the neutrophil-to-lymphocyte ratio (NLR), a marker generally linked to greater inflammation.
This
Medical News report notes that this finding conflicts with several earlier studies suggesting pomegranate juice
may actually lower inflammatory activity.
The research team believes the differing results may reflect variations in disease stage, treatment timing, or patient characteristics. They stressed that the immune effects of pomegranate juice remain uncertain and require additional investigation before firm recommendations can be made.
Many supplements showed limited overall benefit
The researchers also evaluated fatty acids, vitamin D, melatonin, acetylcysteine, quercetin, vitamin B, ginger, glycocalyx formulations and several combination nutritional products.
Although some supplements ranked highly for specific laboratory markers, most did not produce statistically significant improvements in important clinical outcomes such as deaths, fever, headaches, cough, breathing difficulties, C-reactive protein levels, white blood cell counts, or neutrophil counts. Vitamin C ranked highest for reducing deaths, but the difference was not statistically significant.
The investigators emphasized that nutritional supplements should be considered supportive therapies rather than standalone treatments for COVID-19.
More research is still needed
Despite including thousands of patients, the researchers acknowledged important limitations. Some treatment comparisons relied on relatively small numbers of participants, while several findings were based largely on indirect comparisons rather than direct head-to-head clinical trials. Confidence in several results ranged from low to very low, meaning future studies could produce different conclusions.
They believe large international clinical trials are now needed to determine which patients are most likely to benefit from specific nutritional supplements and the safest timing and dosage for each intervention.
Conclusion
The study provides encouraging evidence that certain nutritional supplements, particularly vitamin C and nanocurcumin, may help improve specific immune and inflammatory markers when used alongside standard COVID-19 treatment. However, the findings also demonstrate that many supplements produce little measurable clinical benefit, while others may have effects that remain uncertain or even contradictory. Until stronger evidence becomes available, nutritional supplements should be viewed as carefully selected supportive therapies under medical supervision rather than proven treatments capable of preventing severe COVID-19 or replacing established medical care.
The study findings were published in the peer reviewed journal: Frontiers in Nutrition.
https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2026.1825539/full
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Read Also:
https://www.thailandmedical.news/articles/coronavirus
https://www.thailandmedical.news/articles/long-covid
https://www.thailandmedical.news/articles/covid-19-supplements
https://www.thailandmedical.news/articles/covid-19-herbs
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