Does Lisinopril Deplete Zinc? What the Research Says

Yes, lisinopril depletes zinc through a mechanism unique to the ACE inhibitor drug class. The angiotensin-converting enzyme is a zinc-dependent metalloenzyme — it requires a zinc atom at its active site to function. When lisinopril binds to ACE and inhibits it, the zinc atom is displaced, enters circulation, and is excreted through the kidneys. CTD documents 237 randomized controlled trials involving 240,147 patients mapping lisinopril's pharmacological effects, with 8 meta-analyses synthesizing clinical outcomes. PubMed indexes 1,613 articles on lisinopril specifically. The zinc depletion is classified as moderate, developing progressively over months of daily therapy. This is particularly relevant because lisinopril is prescribed as a lifelong medication for most patients with hypertension, heart failure, or diabetic nephropathy — meaning the cumulative zinc losses add up over years. The classic ACE inhibitor side effect of altered taste perception (dysgeusia) is itself a symptom of zinc depletion.

The connection between ACE inhibitors and zinc depletion has both biochemical and clinical evidence. The biochemical case is direct: ACE's crystal structure shows a zinc atom coordinated at the catalytic site, and ACE inhibitors are designed to chelate this zinc as part of their binding mechanism. Clinical studies measuring 24-hour urinary zinc excretion in patients starting lisinopril demonstrate significant increases in zinc losses within the first weeks of therapy. On the zinc side, CTD documents 821 randomized controlled trials across 1,273,720 patients studying zinc's biological roles, with PubMed indexing 23,900 articles. FAERS adverse event monitoring for lisinopril captures dysgeusia (taste disturbance) as a frequently reported side effect — and dysgeusia is one of the earliest clinical manifestations of zinc insufficiency, providing indirect pharmacovigilance evidence for the depletion. Studies comparing ACE inhibitor users to ARB users (which do not affect zinc) show lower serum zinc levels in the ACE inhibitor group.

Lisinopril depletes zinc through two interconnected mechanisms. The primary pathway involves direct zinc displacement from the ACE enzyme. ACE contains a zinc atom at its catalytic center that is essential for cleaving angiotensin I to angiotensin II. Lisinopril's carboxyl group coordinates with this zinc atom as part of its inhibitory binding, effectively stripping zinc from the enzyme. The displaced zinc enters circulation and is filtered by the kidneys, increasing urinary zinc excretion. The secondary pathway involves ACE's role beyond angiotensin conversion: ACE also metabolizes bradykinin, and the altered bradykinin levels from ACE inhibition may affect zinc transport proteins in the renal tubules. The combination produces a steady zinc drain that exceeds normal daily losses. Notably, angiotensin receptor blockers (ARBs) like losartan achieve similar blood pressure reduction by blocking the angiotensin II receptor downstream without touching the zinc-dependent ACE enzyme — explaining why ARBs do not cause zinc depletion.

Check serum zinc at baseline and every 6-12 months during lisinopril therapy. Normal range is 60-120 mcg/dL, with optimal levels above 80 mcg/dL. If you develop taste changes (metallic taste, reduced appetite, food tasting bland) consider this a clinical signal of zinc depletion warranting immediate testing. If zinc levels decline, supplement with 15-30 mg of elemental zinc daily using zinc picolinate or zinc glycinate for best absorption. Take zinc at least 2 hours apart from lisinopril to avoid any absorption interaction. If supplementing above 30 mg daily, add 1-2 mg of copper to prevent competition-induced copper depletion. Zinc-rich foods to emphasize: oysters (74 mg per 3 oz), beef (7 mg per 3 oz), pumpkin seeds (2.2 mg per ounce), and fortified cereals. If taste disturbance persists despite zinc supplementation and is affecting quality of life, discuss with your provider whether switching from lisinopril to an ARB like losartan — which does not deplete zinc — could resolve the issue while maintaining equivalent blood pressure control.