Supplement·Interactions·Reviewed June 9, 2026
L-Arginine interactions.
L-Arginine has 18 documented interactions in the NutriStack database: 1 to avoid or watch closely, 13 that need timing or caution, and 4 that work synergistically. The full list, with what each pairing does, is below.
L-Arginine at a glance.
A quick, data-grounded summary. The full table is below.
L-Arginine has 18 documented interactions in the NutriStack database: 1 to avoid or watch closely, 13 that need timing or caution, and 4 that work synergistically. The full list, with what each pairing does, is below.
Everything that interacts with l-arginine.
Every supplement and medication in the NutriStack database with a documented interaction with this substance, highest-severity first. Open any pair for the mechanism and sources.
| Substance | Interaction | What happens |
|---|---|---|
| L-Lysine | Conflict | Arginine and lysine compete for cellular uptake; high-dose arginine can reduce lysine's effect on HSV outbreak prevention. |
| Alfuzosin | Caution | L-Arginine can reduce blood pressure through nitric oxide production. Alfuzosin is generally uroselective but still has clinically relevant... details → |
| Amlodipine | Caution | L-Arginine is a nitric oxide precursor that lowers systolic and diastolic blood pressure by about 5/3 mmHg in meta-analysis. Combined with... details → |
| Atenolol | Caution | L-Arginine modestly lowers blood pressure through nitric oxide-mediated vasodilation. Stacked with atenolol's beta1 blockade, the combined drop can... details → |
| Chlorthalidone | Caution | L-Arginine can lower blood pressure, and chlorthalidone is a long-acting antihypertensive diuretic. Combining them can produce additive... details → |
| D-Aspartic Acid | Caution | These two are frequently stacked in test booster plus pump formulas on the assumption that they are synergistic, but in testicular tissue they act... |
| Hydrochlorothiazide | Caution | L-Arginine can lower blood pressure through nitric-oxide-mediated vasodilation. Hydrochlorothiazide is an antihypertensive diuretic, so adding... details → |
| Isosorbide Mononitrate | Caution | Isosorbide mononitrate and L-arginine both increase nitric-oxide-mediated vasodilation. In a human crossover study, L-arginine enhanced the blood... details → |
| Metoprolol | Caution | L-Arginine is a nitric oxide precursor that lowers blood pressure on its own. Stacked with metoprolol's beta1 blockade, the combined fall in blood... details → |
| Nitroglycerin | Caution | Nitroglycerin and L-arginine both increase nitric-oxide-mediated vasodilation. Using them together can add to blood pressure lowering, headaches,... details → |
| Sildenafil | Caution | L-arginine is a nitric oxide precursor, and sildenafil enhances NO/cGMP signaling by inhibiting PDE5. Combined use can cause additive vasodilation... details → |
| Tadalafil | Caution | Same mechanism as sildenafil + L-arginine. Tadalafil has a 36-hour half-life, making the interaction window much longer than sildenafil. details → |
| Tamsulosin | Caution | L-Arginine can modestly lower blood pressure by increasing nitric-oxide-mediated vasodilation. Tamsulosin can also cause orthostatic hypotension in... details → |
| Timolol Ophthalmic | Caution | L-Arginine can modestly lower blood pressure through nitric-oxide-mediated vasodilation. Timolol eye drops can be systemically absorbed and lower... details → |
| L-Citrulline | Synergy | Citrulline is converted to arginine in the kidney, raising plasma arginine higher and longer than oral arginine alone. Combined use provides... |
| Lisinopril | Synergy | L-Arginine is the substrate for endothelial nitric oxide synthase, and oral supplementation produces modest blood pressure reductions (about 5 mm Hg... details → |
| Maca Root | Synergy | The pair approaches sexual function from two angles, with Maca acting on libido and sexual desire while L-Arginine supports the nitric oxide pathway... |
| Pine Bark Extract | Synergy | Pine bark extract (Pycnogenol) combined with L-arginine improved erectile function and endothelial nitric oxide signaling in controlled clinical... |
The full l-arginine profile.
Benefits, dosing by goal, forms, and the cited evidence for this supplement.
Common l-arginine questions.
Quick answers drawn from the table above.
What interacts with L-Arginine?
In the NutriStack database, L-Arginine has 18 documented interactions with other supplements and medications. The most notable include L-Lysine, Alfuzosin, Amlodipine, Atenolol, and Chlorthalidone.
What should you not take with L-Arginine?
L-Arginine is flagged against 1 substance in the database, including L-Lysine. Review these with a clinician before combining, especially alongside prescription medications.
What works well with L-Arginine?
L-Arginine pairs synergistically with L-Citrulline, Lisinopril, Maca Root, and Pine Bark Extract in the NutriStack database. Synergy still depends on dose and timing; open any pair for the detail.
Can you take L-Arginine with L-Lysine?
NutriStack classifies the L-Arginine and L-Lysine pairing as conflict: Arginine and lysine compete for cellular uptake; high-dose arginine can reduce lysine's effect on HSV outbreak prevention. Separate by 2 hours and avoid high-dose arginine during active HSV outbreaks. Reduce dietary arginine sources (nuts, chocolate) when using lysine...
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