WHAT ARE PHOSPHATIDYL SERINE TABLETS 100mg? Phosphatidyl Serine Tablets contain an impressive 100mg Phosphatidyl Serine per tablet. Many other products on the market contain less than half this dose. Phosphatidyl Serine, sometimes referred to as PS, is a phospholipid membrane that plays a role in cell signalling. Soya Lecithin contains more PS than any other food, with a majority …[1000]