Researchers have pinned down exactly how much Vitamin C is needed to maximise immune health.

New Otago University, Christchurch research has found for every 10kg over the baseline of 60kg a person weighs - their body needs an extra 10 milligrams.

That means if you weigh 90 kilos, you need an extra 30 milligrams over the daily 110 milligrams of Vitamin C.

Associate Professor Anitra Carr says overweight people may be more susceptible to getting severe Covid, because their Vitamin C levels are lower.

She says many don't realise the bigger someone is, the more Vitamin C they should consume. 

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