Liz Earle looks at the latest research into Britain's most popular health supplement and explains how it can be used to relieve a variety of ailments, including arthritis, psoriasis and eczema.

Bestselling beauty and wellbeing writer Liz Earle's fully revised and updated quick guide to cod liver oil, including:

- The history of the oil and its legendary properties
- How essential fatty acids work
- The latest research into the oil for arthritis
- How it helps the skin (including eczema and psoriasis problems)
- A dosage guide for the family