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Ingestion of vitamins and minerals is important for COVID-19 measures (COVID-19 measures 4)  

National guidelines for food is necessary for improving immunity (COVID-19 Measures 3),
Improve immunity (COVID-19 Measures 2),
How to inactivate coronavirus (COVID-19 Measures 1),

NIH (National Institutes of Health) is conducting clinical trials to see if vitamin C, vitamin D, and zinc are effective against covid-19 as a countermeasure .

These supplements have been studied by many laboratories in the world because they are considered to be effective for infectious diseases similar to covid-19, but these laboratories can not obtain significant effects on covid-19, because it is difficult to collect a large number of clinical trial samples.

The following comments have been published regarding vitamin C in particular by NIH.


Vitamin C (ascorbic acid) is a water-soluble vitamin that is thought to have beneficial effects in patients with severe and critical illnesses. It is an antioxidant and free radical scavenger that has anti-inflammatory properties, influences cellular immunity and vascular integrity, and serves as a cofactor in the generation of endogenous catecholamines.1,2 Because humans may require more vitamin C in states of oxidative stress, vitamin C supplementation has been evaluated in numerous disease states, including serious infections and sepsis. Because SARS-CoV-2 infection may cause sepsis and acute respiratory distress syndrome (ARDS), the potential role of high doses of vitamin C in ameliorating inflammation and vascular injury in patients with COVID-19 is being studied.

These three supplements (vitamin C, vitamin D, zinc) have been verified by numerous laboratories in many countries such as the United States, Europe, and China, and are considered to be effective against covid-19.

The amount of vitamin C used increases as the symptoms become more severe. For example, daily intake of 2-8 g of vitamin C shortens the period of respiratory distress caused by covid-19. And 6-24 g of vitamin C is injected intravenously daily, the number of deaths has decreased. NIH's 2020 report recommends taking intravenous injections for critically ill patients in ICUs and as a drug for hospital patients.

In Japan, the standard intake of vitamin C is 100 mg, but in the United States, it is common to take 1,000 mg by megavitamin therapy. As a measure against covid-19, 1,000 mg or 2,000 mg of vitamin C, 5.0 micrograms of vitamin D, and 7.0 mg of zinc may be necessary. These are dietary amounts, but vitamin C requires supplements.



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