I was told that Vitamin C can help with arrhythmia. Can it also cause your heart rate to drop? My heart rate has been staying around 39-40, especially at night. I stayed around 55-60 most of the day but now it won't come up again. It often goes high but not low. Three days ago I had an episode where it stayed between 145- 150 for about 3 hrs. I took a Bystolic but now I am having a hard time keeping it up.