Potassium/Magnesium aspartate
Potassium and magnesium aspartate supplies two intracellular electrolytes bound to aspartic acid as a carrier. Both minerals govern the electrical activity of heart and muscle cells, and low levels of either destabilise heart rhythm. It is used to correct deficiency of these electrolytes and as supportive treatment where arrhythmia is linked to them.
It is taken with food, which is easier on the stomach. The main issue is that potassium can accumulate: ACE inhibitors such as lisinopril and enalapril, the angiotensin blocker losartan, and the potassium-sparing diuretic spironolactone all reduce potassium excretion, and adding a potassium supplement on top of any of them pushes levels higher still. The kidneys are the only meaningful route of potassium removal, hence the caution in kidney disease. Potassium, magnesium and creatinine are checked to see both the electrolyte level and how well the kidneys are clearing it.
Muscle weakness, numbness or tingling, a slow or irregular pulse, or new palpitations can all reflect potassium that has risen too far and warrant seeing a doctor promptly. The same applies to anyone on the interacting blood-pressure or diuretic drugs, or with known kidney disease, before continuing.
Reference information, not medical advice. Discuss any change with your doctor.