High-dose vitamin C supplementation is unlikely to be effective for preventing or treating colds and flu.

“it does not seem that taking high doses of vitamin C and I would Place 6 to8 grams of vitamin C in the high dose range is going to be effective for treating or preventing colds and flu”

Due to soil depletion and modern dietary patterns, supplementation with omega-3s, vitamin D3, magnesium, zinc, and selenium is often necessary for optimal health.

“I think everybody should take omega 3 fats at least a gram or two of EPA, DHA. Most people need between two to 4,000 international units of vitamin D3. I think a good multivitamin can cover the rest for most people.”