No, I don't know why exactly vit. C seems to help.
I can only assume it has to do with vit. C's general potential in helping (serious)heart patients to recover from heart atatcks etc. I think vit. C strengthens the artery walls.
All I can say is that I feel a HUGE difference after I've been on high dosages of vitamin C for about 10 days. The palpitaions are close to gone. Nothing else has been able to do this - and I've tried a lot.
There's one more thing that helps somewhat. It's called 'Crysalis'. That reduces my palpitations to some degree (but not nearly enough to do Miracle-Mineral-Supplement ). Chrysalis has also reduced my pollen allergies by about 95% and has improved my sleep. I'm still not sure if it somehow impacts Miracle-Mineral-Supplement ' effect negatively. The opposite, at least, seems not to be the case.