So if this ellagic acid is so good at preventing cancer from multiplying and becoming a reason for death among those that have these cancer cells, why doesn't more people know about this? That is the main question that people ask. No doctor is going to prescribe something to someone that has not been tested and tried for years. Which is one of the reasons why the use of ellagic acid is not approved yet. However, there are constantly studies that are being performed in labs to ensure that the acid is safe for use, and in time we may see the drug approved by the Food and Drug Administration.