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Vitamin A - a nutrient found in cod liver oil - is sometimes offered as a part of a treatment for measles, especially if someone is deficient, Dr Cook said.

Being deficient may impair the immune system, but for the vast majority there is little to be gained from having extra.

Edison said it blames the damage and deaths caused by the Montecito debris flows on “inadequate governmental flood control infrastructure and deficient evacuation communications.”

The review offered on Saturday is based on "low confidence" which means the intelligence supporting it is deficient, inconclusive or contradictory.

More than 40% of adult Americans are deficient in vitamin D. Low levels are linked to fatigue, bone pain, muscle weakness, mood disorders and cognitive decline.