olcoolone

I have got a 5 1/2 yr old Lab Bitch that has been diagnosed with Epilepsy since she was 2yrs of age. She is on medication and having Blood tests every 6mths to make sure her levels are within the acceptable range. I have been told by a fellow Lab owner that they are feeding their dog Silverbeet and it is having less frequent Seizures. Can anybody help me with any comments for and/or against feeding Silverbeet. Has anybody been told not to feed Silverbeet to dogs etc. Thanks