While the body can make its own PS, we rely on receiving some directly from what we eat, making PS a semi-essential nutrient. The trouble is, modern diets are deficient in PS unless you happen to eat a lot of organ meats, in which case you may take in 50mg a day. A vegetarian diet is unlikely to result in even lOmg a day.

The secret of the memory-boosting properties of PS is probably its ability to help brain cells communicate. It is particularly helpful for those with learning difficulties or age-related memory decline and, in one study, only 12 weeks on 300mg of PS significantly improved the ability of the people who were tested to match names to faces. With sixteen clinical trials proving that it works, phosphatidyl serine is a tried and tested nutritional support for memory.