Dr. Fauci says he takes Vitamin D and C to “lessen susceptibility to infections”
insider.com
insider.com
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"If you're deficient in vitamin D, that does have an impact on your susceptibility to infection. I would not mind recommending, and I do it myself, taking vitamin D supplements," he said. "The other vitamin that people take is vitamin C because it's a good antioxidant, so if people want to take a gram or so of vitamin C, that would be fine."
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The people who are susceptible to colds will be just as susceptible to COVID-19 and supplements will do about nothing.
Much less than religiously washing hands and wearing quality masks, preferably respirators, for sure.