Bloodpril ReviEwS (2026): We Read the Label So You Don’t Have To
This article usually turns into a complaint about missing information. Not this time — the most important number is actually printed. What that number reveals is the problem.
The blend total is published at 500 mg. The per-ingredient split is not. The total is the number that matters.
What is published
The official page states the formula clearly: a 500 mg proprietary amino acid blend of L-Arginine HCL, L-Arginine Alpha-Ketoglutarate and L-Citrulline Malate. Two capsules daily, 60 capsules per bottle, 30-day supply. Other ingredients are listed as gelatin capsule, rice flour and magnesium stearate.
That is more disclosure than most direct-response supplements provide. A great many publish a list of names and no numbers at all, which forces a reviewer to reason from capsule capacity and leaves the conclusion arguable. Here it is not arguable.
What the number tells you
Take the published 500 mg and set it beside the doses used in the human trials behind these ingredients.
L-arginine: blood pressure meta-analyses cluster around 6,000–12,000 mg daily, with some trials going considerably higher, and almost all of them splitting the dose. The reason for such large amounts is well understood — arginase enzymes in the gut wall and liver destroy most of an oral dose before it reaches circulation.
L-citrulline: 3,000–6,000 mg daily over six to twelve weeks, producing modest reductions of a few mmHg.
Combined: 9,000–18,000 mg. Delivered: 500 mg, split three ways. That is roughly 3% to 6%.
Check the current Bloodpril discount
Multi-bottle pricing drops to $49 a bottle on the largest package. Verified 2026-08-22 — and unusually for this category, there is no inflated reference price attached.
See Bloodpril pricingAffiliate link. We may earn a commission at no additional cost to you. Verified 2026-08-22.
What is still missing
One thing, and it would change the assessment at the margin: the split between the three aminos.
If citrulline makes up the bulk of the 500 mg, the product is better than if arginine does — citrulline survives first-pass metabolism far more efficiently, so more of it reaches circulation per milligram swallowed. If the arginine forms dominate, most of what you swallow is degraded before it does anything.
Even the best case is thin. A hypothetical pure 500 mg citrulline dose would sit at about a sixth of the low end of its researched range. But the difference between one sixth and one thirtieth is worth knowing, and one email would settle it.
Nitrates, sildenafil and the pathway problem
This is the interaction that matters most, and it follows directly from the mechanism working as advertised.
Nitrate medicines — nitroglycerin, isosorbide mononitrate and dinitrate — work by donating nitric oxide directly into the vasodilation pathway. PDE5 inhibitors — sildenafil, tadalafil, vardenafil — work by preventing the breakdown of the cGMP signal that nitric oxide produces. And L-arginine and L-citrulline increase your own nitric oxide production.
Three different routes converging on one effect. Combining them can lower blood pressure further than any of them was intended to, and the practical consequences — dizziness on standing, fainting, falls — are not trivial in an older population.
To its credit, the seller names nitrates specifically in its FAQ rather than hiding behind generic boilerplate. That is more than most manage. But it deserves to be a conversation with a pharmacist rather than a line you scroll past.
Independent background reading, none of it selling anything: NIH Office of Dietary Supplements, PubMed and MedlinePlus on dietary supplements. For the applied version of this on our own pages, see our full independent review 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
Ask your prescriber first. These amino acids act on the nitric oxide pathway and can add to the effect of antihypertensive treatment.
Not without medical advice. Nitrates donate nitric oxide and PDE5 inhibitors prolong its signal; adding a precursor creates three routes to the same vasodilation.
Yes. A randomised trial of L-arginine in post-infarction patients was halted early because more deaths occurred in the arginine group. Treat this as a cardiologist conversation.
No, never. Improved readings on medication mean the medication is working. Any dose change is a monitored conversation with your prescriber.
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.