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Dr Hill said her research team wanted to find out if cold water dipping "can be used as some kind of supplementary therapy if there's a diagnosis".

The new laws will also allow some infected individuals to claim supplementary payments if extra evidence is provided.

Hansen urged skeptics to look at his study and its supplementary material.

This publication makes it clear that it isn't new research – rather, it's a new hypothesis formed by referencing the results of a study published in 2004 — alongside additional supplementary research to support the theory.

Expectant mothers and women trying to conceive should continue to take supplementary folic acid - the synthetic version of the vitamin folate - as currently advised by medical practioners.