with 100mg of phosphatidyl serine, a level consistent with studies , zinc at 50% nrv, contributes to normal cognitive function , purest form from non-gm soya , in easy to swallow vegetarian tabletsphosphatidyl serine (ps) is not an essential nutrient as it can be made in the body. however, with age, the body\'s synthesis of it can decline. ps is often described as one of the building blocks of brain cell membranes. studies undertaken to date have been largely positive and have shown it to be safe for long term use. we normally suggest customers try our ps product for 6 weeks before deciding if it\'s for them and remember we have a full money back guarantee! nature\'s best ps is a pure form derived from non gm soya and each vegetarian tablet contains 100mg of ps, a level consistent with studies. we\'ve also added 5mg of zinc (50% of the nrv), a mineral acknowledged by efsa as contributing to normal cognitive function. at a glance some companies\' products may appear to have 100mg of ps per tablet when in fact they provide just 20% of this amount, namely 20mg; so beware! ps makes the perfect partner to refreshall®, our product for memory which contains ginkgo 6000 plus herbs and it can be taken alongside any of our multi\'s without fear of duplication.