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