100mg of phosphatidyl serine, a level consistent with studies, with 5mg zinc for normal cognitive function, purest form of non-gmo soya phosphatidyl serine (ps) is often described as one of the building blocks of brain cell membranes. however, as we get older, our natural production starts to decline, which is why supplementation is often recommended. phosphatidyl serine 100mg makes the perfect partner to refreshall®//p 128//class=f-brand!important, our best-selling product specifically designed for memory with ginkgo 6000 & other herbs. ps can also be taken alongside any of our multis without fear of duplication. it also makes the perfect partner to omega 3 fish oils//coils//class=f-brand!important containing dha, for the maintenance of normal brain function. at a glance, some companies' products may appear to deliver 100mg of ps per tablet when in fact they provide just 20% of this amount. at nature’s best, you can be sure that each tablet contains 100mg of ps, a level consistent with studies. we've also included 5mg of zinc (50% of the nrv) for normal cognitive function & iodine which plays a role in supporting normal cognitive & neurological function. we normally recommend taking ps for 6 weeks before deciding if you like it. & you can shop with complete confidence knowing you have time to notice the difference or your money back guarantee. our high-strength formula comprises the best raw materials from reliable & responsible suppliers. our phosphatidyl serine derives from non-gm containing soya. before being manufactured & packaged in uk factories working to good manufacturing practice (gmp), our formula receives stringent quality checks, ensuring it meets the strictest eu regulations on contaminants. at nature’s best, we want to help our customers choose the best products to suit their needs. if you’re unsure about what to pick, please get in touch with one of our expert nutrition advisors//aadvice//class=f-brand!important. what does zinc contribute to? zinc contributes to the normal cognitive function.