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L-Arginine Side Effects and Blood Pressure Cautions
L-arginine side effects are usually mild: nausea, bloating, stomach pain and diarrhea. The bigger risk is low blood pressure, especially with nitrate medicines, sildenafil or blood-pressure drugs. One Stallion Power gummy holds 5 mg or less of L-arginine, but ask your doctor first if you take any of these.
Written by the Stallion Power label deskUpdated · 5 min read
Common effects01
What are the common L-arginine side effects?
The common L-arginine side effects are stomach ones: abdominal pain, bloating, nausea and diarrhea (MSKCC, Arginine).
Mayo Clinic adds gout, headache, allergic reactions and worse asthma to the list (Mayo Clinic, L-arginine). In the ED trials, side effects appeared in 8.3% of arginine groups and 2.3% of placebo groups, none severe (Rhim 2019, arginine and ED meta-analysis).
Those trials used 1,500 to 5,000 mg a day. A gummy with 5 mg or less sits far below that, by our label arithmetic.
Blood pressure02
Does L-arginine lower blood pressure?
Yes, it can. Arginine may lower blood pressure, and the effect can add to blood-pressure drugs (MSKCC, Arginine).
Mayo Clinic warns that nitrate chest-pain medicine or sildenafil taken with L-arginine might push pressure too low (Mayo Clinic, L-arginine). Prescription sildenafil itself must never be combined with nitrates (MedlinePlus, Sildenafil).
| If you... | Why it matters |
|---|---|
| take a nitrate or nitroglycerin | Pressure can fall too far |
| take sildenafil or a similar ED drug | Effects can add up |
| take a blood-pressure medicine | Pressure may drop below target |
| had a recent heart attack | Mayo advises against it |
Warning signs03
When should you stop and call a doctor?
Stop and call a doctor if you feel faint, dizzy, short of breath or have chest pain after taking a supplement.
The label itself says to discontinue and consult your doctor if any adverse reaction occurs. The signs below mark the points where waiting is not wise.
- Chest pain, fainting or a racing heartbeatStop and call 911. Do not wait to see if it passes.
- An erection lasting more than four hoursGo to an emergency room now. This needs urgent care to protect the penis.
- Dizzy or faint when you stand, especially on blood-pressure or nitrate medicineSit or lie down, stop the gummy and call your doctor before the next one.
- Rash, swelling or hivesStop. Trouble breathing or a swollen face or throat needs 911.
- Yellow skin or eyes, dark urine or belly painStop and call your doctor the same day. Liver problems have been reported with some herbal extracts.
- Cramps or loose stoolsSorbitol and the other ingredients can upset the stomach. Stop if it continues and ask your doctor.
Call 911For chest pain, trouble breathing, a swollen face or throat, or if someone passes out.
Priapism guidance (NHS, Priapism); supplements and medicines (FDA, Mixing medications and supplements); liver reports (NIH ODS, Ashwagandha).
Stallion Power: from $49 a bottle30 gummies · 2, 3 or 6 bottles · free shipping on 3 or 6 · 60-day guarantee
See packsThe label04
What does the Stallion Power label say about this?
The label warns anyone taking medications or with a medical condition to consult a doctor.
It prints no L-arginine amount. L-arginine is seventh of nine lines in an 82 mg blend, after the 5 mg caffeine. The side effects page covers the other eight lines, and the L-arginine page covers this one.
FDA has found hidden drugs in some male enhancement products (FDA, Tainted sexual enhancement products). We have not tested this gummy.
What to do05
How can you lower the risk?
Tell your doctor or pharmacist about every medicine and supplement you take, then follow their advice.
Keep taking prescribed medicine as directed. Store gummies where children cannot reach them. Report a bad reaction to FDA through its Safety Reporting Portal.
Want to try Stallion Power? Both packs ship free, and both come with the 60-day guarantee (all bottles returned, even empty ones).
Prices on the sales page, October 18, 2026 (Stallion Power sales page). Check your medicines with your doctor first.
FAQ06
L-arginine safety questions
Can L-arginine cause diarrhea?
Yes. Diarrhea, bloating, nausea and stomach pain are the most commonly listed effects of arginine supplements (MSKCC, Arginine). They are linked mainly to gram-level doses, not to a 5 mg share of a blend.
Is L-arginine safe with sildenafil?
Not without medical advice. Mayo Clinic says combining L-arginine with sildenafil might make blood pressure too low (Mayo Clinic, L-arginine). Ask your prescriber before adding any arginine product to an ED drug.
Who should avoid L-arginine?
People who recently had a heart attack should avoid it, and people on nitrates or blood-pressure drugs should ask first (Mayo Clinic, L-arginine). Pregnant or nursing women should consult a doctor, as the Stallion Power label advises.
Does one Stallion Power gummy have enough L-arginine to matter?
The label gives no amount, but the blend order caps it at 5 mg. That is our arithmetic, not a lab test. Interactions with other medicines still deserve a doctor question.
Who wrote this07
Written and reviewed by
Pages built from the label, the sales page and linked NIH, FDA, CDC, FTC and peer-reviewed sources.
Last updated . Read our editorial standards and how we check reviews. This website is run by Stallionpowermen, a USA stocking retailer for Stallion Power, not by the manufacturer or the distributor. We are paid a commission when you buy through our order links.
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