WHAT PHARMACEUTICAL GRADE MEANS? Each oil has different chemical constituents. This usually occurs because the plant is grown in a different area of the world or a distinct climate that alters the chemistry of the plant! EX: If we analyze Pomegranate seed oil , during any season it will contain a standard level of Punicic and it is called pure oil but if we test the Pomegranate Seed oil harvested during the spring season the Punicic LEVEL is much higher So, it is different oil and has different medicinal properties and it is called pharmaceutical grade pure oil.