Bloodpril and Nitrates: The Interaction That Follows From the Mechanism Working
This is the one article on this site we would ask you to read even if you have already decided not to buy, because the point applies to every nitric oxide supplement rather than one brand.
Nitrates donate nitric oxide. PDE5 inhibitors prolong its signal. These amino acids increase your own production. Three routes, one effect.
How each route works
Nitrate medicines — nitroglycerin under the tongue for angina, isosorbide mononitrate or dinitrate taken regularly — are nitric oxide donors. They release NO directly into the vasculature, bypassing the endothelium entirely. That is why they work within minutes.
PDE5 inhibitors — sildenafil, tadalafil, vardenafil — block the enzyme that degrades cGMP, the second messenger nitric oxide produces. They do not create the signal; they stop it being switched off.
L-arginine and L-citrulline increase the substrate available for your own endothelial cells to make nitric oxide.
Three mechanisms, one endpoint: vasodilation.
Why combining them is the concern
The nitrate and PDE5 combination is already a well-known contraindication in medicine — it is one of the first things checked before prescribing sildenafil, because together they can cause dangerous hypotension.
Adding a nitric oxide precursor on top is a third input to the same system. At 500 mg the practical magnitude is likely small — that is the honest assessment, and it would be alarmist to say otherwise. But “likely small” is not a judgement to make on your own behalf about a pathway where the drug combination is a documented emergency, and where the consequences are measured in falls and fainting in an older population.
Compare Bloodpril packages and discount pricing
The two-bottle package is a 60-day supply against a 60-day guarantee — the only option whose full cost stays inside your refund window.
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What the seller does and does not do
To its credit, the official page names nitrates specifically: it advises consulting a physician if taking blood pressure medication, heart medication, nitrates or any cardiovascular prescription drug. That is more specific than the generic “consult a healthcare professional” boilerplate most pages use, and it deserves acknowledging.
What it does not do is explain why, which is the part that changes behaviour. A reader who understands that nitrates and these amino acids converge on one pathway will make the call. A reader who sees a generic warning list scrolls past it.
If you take anything cardiovascular, take a photograph of the ingredient list to a pharmacy counter. It costs nothing and takes about two minutes.
The websites that disagree with each other
This is the strangest thing we found, and it has practical consequences for anyone ordering.
Bloodpril is sold through an unusually large network of near-identical websites. They do not describe the same product.
The main US site sells a 500 mg amino acid blend of arginine and citrulline. Another site in the same network describes a formula built around berberine, bitter melon, white mulberry leaf and juniper berry — those are blood sugar ingredients, not blood pressure ones. A third mentions cinnamon and apple cider vinegar. A fourth advertises blueberry extract and declares “No proprietary blends. No label decoration.” — in direct contradiction of the main site, which sells exactly a proprietary blend.
Those descriptions cannot all be true of one product. Whatever the explanation, the practical consequence is the same: confirm the ingredient list on the page you are actually buying from, and photograph the Supplement Facts panel when the bottle arrives.
Independent background reading, none of it selling anything: the FDA dietary supplement overview, CDC on high blood pressure and NCCIH on high blood pressure. For the applied version of this on our own pages, see realistic expectations and timelines or the Bloodpril official website reference.
What we would do
Take the ingredient list to a pharmacist before ordering if you take anything cardiovascular, and to a cardiologist if you have had a heart attack. Buy a validated upper-arm monitor and record twice-daily readings for a fortnight before your first capsule so you have a baseline rather than an impression. Choose the two-bottle package, since 60 days of product against a 60-day guarantee is the only combination that keeps your whole spend inside the refund window. Diarise day 50 on the day you order.
Frequently asked
Two bottles $158 ($79 each) plus $9.99 shipping, three bottles $207 ($69 each) with free US shipping and six bonus guides, or six bottles $294 ($49 each) with the same extras.
No, and that is worth crediting. There is no crossed-out reference price, no countdown timer and no stock counter. Every package total multiplies correctly.
Sixty days from purchase, with unusually generous terms: return all bottles in any condition, no restocking fees, authorisation within 24 hours and refund within 7 business days.
Ask your prescriber first. These amino acids act on the nitric oxide pathway and can add to the effect of antihypertensive treatment.
Disclaimer. This formula acts on the nitric oxide pathway — the same pathway as nitrate medicines such as nitroglycerin and isosorbide, and as PDE5 inhibitors such as sildenafil. Take the ingredient list to a pharmacist before ordering if you take any cardiovascular medication, and to a cardiologist if you have had a heart attack. Never stop or reduce prescribed blood pressure medication to take a supplement. These statements have not been evaluated by the Food and Drug Administration, and Bloodpril is not intended to diagnose, treat, cure or prevent any disease.
Affiliate disclosure. This page contains affiliate links. We may earn a commission if you purchase through them, at no additional cost to you. That does not change what we publish — see our full disclosure.