Taking potassium supplements (like KCl) doesn't lower blood pressure, which shows that the blood pressure-lowering effect of nitrate supplements comes from the nitrate part, not the potassium.

If people eat less salt and more potassium-rich salt, the extra potassium might lower their blood pressure more than cutting back on salt alone — and most of that drop seems to come from the potassium.

If you eat less salt but add more potassium to it, your blood pressure might drop more if you usually don’t get much potassium in your diet—because your body gets a bigger boost from the potassium than it loses from the sodium.

For a few days, extra potassium lowers mice's blood pressure, but after three weeks, it starts to raise it again.

If you eat more potassium every day—like from bananas or potatoes—your blood pressure might drop just a tiny bit, but not enough to matter for your health if you don’t already have high blood pressure.

If adults with high blood pressure eat more potassium-rich foods—like bananas or spinach—by about 50 mmol per day, their blood pressure numbers go down a bit, which might help lower their risk of heart problems.