Valsartan Interactions

Valsartan is an angiotensin II receptor blocker that suppresses aldosterone and slows renal potassium excretion. The FDA-approved Diovan label specifically warns that potassium supplements and potassium-containing salt substitutes may lead to clinically significant hyperkalemia, particularly in patients with renal impairment, diabetes, or heart failure.

Spirulina has modest antihypertensive effects in clinical trials (systolic drop of around 4-5 mmHg) and contains roughly 14 mg of potassium per gram. Combined with valsartan, theoretical risks include additive blood pressure lowering and a minor contribution to potassium load, though at typical supplement doses neither effect is large.