Are there natural remedies to reduce palpitations?

Yes. If your palpitations are intermittent and caused by atrial fibrillation, exercise can reverse acute palpitations. By quickly increasing your heart rate by doing jumping jacks or a quick sprint, you can over-ride the signal to the heart and get back to a normal rhythm. It doesn't work for chronic palpitations and may not always work for intermittent ones , but it is worth a try. Don't over extend.