Melatonin supplementation benefits male hypertensive and female obese rats due to suppression of metabolic disorders and lethal arrhythmia risk. Arrhythmia is a problem with the rate or rhythm of your heartbeat. Protection against arrhythmia may attributed, at least in part, to up-regulation of myocardial Cx43, which is a protein that is essential for the formation of heart structures.
Most "niacin" products are niacinamide. If you want the form discussed in this research, look for nicotinic acid specifically.
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