Schoolchildren have volunteered to be 'guinea pigs' in a study to show if taking fish oils boosts brain power.
Fish oil is said to improve brain power
More than 34 youngsters at Loftus Junior School, in Saltburn, East Cleveland, are taking the pills in yoghurt drinks.
Headteacher Dave Parks came up with the idea after hearing how a problem pupil's behaviour was "transformed" by taking the daily supplements.
Previous studies have shown fish oils improve concentration and learning.
The three-month project has only been running for three weeks, but already anecdotal evidence suggests pupils' handwriting, memory and concentration have improved.
Sources of omega-3 oils
Mr Parks said: "We had one pupil with problems and her grandparents put her on the supplements and within a few weeks her behaviour had changed.
"Her concentration was better, she had settled down and her relationships with other pupils had improved - she started to achieve a lot better than we thought she would.
"This is when I decided to try the supplements on other children - the product we are using is natural and tastes like fruity yogurt."
Fish oil is rich in omega-3 fatty acids and is said to have a range of health benefits including boosting the ability to learn, reducing the chances of a heart attack and improving foetal growth in pregnant women.