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L Arginine and Blood Pressure: Grams a Day, a Small Drop
In a pooled analysis of 11 trials with 387 people, oral L-arginine at 4 to 24 g a day was followed by an average drop of 5.39 mm Hg systolic and 2.66 mm Hg diastolic. The VapoCept panel lists 200 mg, about 5% of the lowest dose studied. It is not a blood pressure treatment.
Written by the VapoCept label deskUpdated · 4 min read
The numbers01
Does L-arginine lower blood pressure?
At gram doses, the average was a small drop, not a treatment effect.
A meta-analysis pooled 11 randomized trials with 387 people taking 4 to 24 g a day. Against placebo, systolic pressure fell 5.39 mm Hg and diastolic 2.66 mm Hg (Dong 2011, Oral L-arginine and blood pressure meta-analysis).
| Measure | Result |
|---|---|
| Trials and people | 11 trials, 387 participants |
| Daily dose | 4 to 24 g |
| Systolic change | 5.39 mm Hg below placebo |
| Diastolic change | 2.66 mm Hg below placebo |
The proposed route02
How might arginine affect blood vessels?
The idea is that the body makes nitric oxide from arginine, which relaxes vessel walls.
That is a proposed mechanism, studied mostly in exercise and blood pressure. NIH's exercise review found arginine usually did not change nitric oxide or blood flow (NIH ODS, Exercise and athletic performance (health professional)), so even the route is unsettled.
Pathways
200 mg + 200 mg + 100 mg + 100 mg · as listed in the brand's panel
Four of the seven lines (two arginine, two citrulline) feed the proposed nitric oxide route: arginine, or citrulline turned into arginine, is the raw material for nitric oxide, which relaxes blood vessel walls. Studies use grams a day (arginine 2,000 to 24,000 mg, citrulline 6,000 to 8,000 mg), mostly for blood pressure and exercise. The listed amounts are 100 to 200 mg.
Illustration of a proposed mechanism, studied mostly in exercise research. It is not a measured effect on mind, and it is not what happens in your body. Sources: (MSK, Arginine (About Herbs)) (Trexler 2019, Citrulline and strength/power meta-analysis) (ISSN position stand, Beta-alanine) (NIH ODS, Niacin (consumer))
Medicines03
Is it safe to combine arginine with blood pressure medicine?
Ask your pharmacist or doctor first, because the effects might add together.
Mayo Clinic says arginine might lower blood pressure, so blood pressure drugs, nitrates or sildenafil might push it too low (Mayo Clinic, L-arginine).
Never change a prescribed dose because of a supplement.
VapoCept: 30 capsules, 30-day bottleOne capsule a day · 2, 3 or 6 bottles · $49 to $79 a bottle per the brand information, confirm at checkout
See packsThe 200 mg line04
What does this mean for the arginine in VapoCept?
The listed amounts are a small fraction of the studied range, and no study tested the capsule.
One 200 mg line is 5% of the 4 g low end, and 400 mg would be 10% (our arithmetic). See the dose math page and the medicines guide. If a clinician agrees, the packs are below.
90-day supply
3 bottles: 90 days
$69a bottle · $207 for 3 · per the brand information
Ships from the U.S. · 60-day guarantee per the sales page
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180-day supply
6 bottles: 180 days
$49a bottle · $294 for 6 · per the brand information
Ships from the U.S. · 60-day guarantee per the sales page
Order 6 bottlesPrices follow the brand information; confirm the live price at checkout. A 2-bottle pack is also offered. Check your medicines with your doctor or pharmacist before you order.
FAQ05
VapoCept questions people ask
How much does L-arginine lower blood pressure?
A pooled analysis of 11 trials found an average drop of 5.39 mm Hg systolic and 2.66 mm Hg diastolic against placebo. Those people took 4 to 24 g a day. Results vary by person, and arginine is not a treatment for high blood pressure.
What dose of arginine was used in blood pressure studies?
The pooled trials used 4 to 24 g of L-arginine a day. The lowest dose, 4 g, is 20 times the 200 mg arginine line in the VapoCept panel. We found no blood pressure study of such a small amount.
Should I check my blood pressure if I take arginine?
If you take blood pressure medicine, ask your clinician whether to track readings. Mayo Clinic warns that pressure might fall too low when arginine is combined with certain drugs. A simple home log helps your clinician see changes.
Sources (7)
- L-arginineMayo Clinic, 2026
- ArginineMemorial Sloan Kettering Cancer Center (About Herbs), 2022
- Effect of oral L-arginine supplementation on blood pressure: a meta-analysis of randomized, double-blind, placebo-controlled trialsDong JY, et al. American Heart Journal 2011;162(6):959-965 (authors from general knowledge; the fetched page showed only the title, journal and results), 2011
- Acute Effects of Citrulline Supplementation on High-Intensity Strength and Power Performance: A Systematic Review and Meta-AnalysisTrexler ET, Persky AM, Ryan ED, Schwartz TA, Stoner L, Smith-Ryan AE. Sports Medicine 2019;49(5):707-718 (abstract via Duke Scholars), 2019
- International Society of Sports Nutrition position stand: beta-alanineTrexler ET, Smith-Ryan AE, Stout JR, et al. Journal of the International Society of Sports Nutrition 2015;12 (abstract via Northumbria University repository), 2015
- Dietary Supplements for Exercise and Athletic Performance: Fact Sheet for Health ProfessionalsNIH Office of Dietary Supplements, 2026
- Niacin: Fact Sheet for ConsumersNIH Office of Dietary Supplements, 2021
Who wrote this06
Written and reviewed by
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Last updated . Read our editorial standards and how we check reviews. This website is the information site of Vapocepts, the U.S. stocking partner for VapoCept. It is not the manufacturer and it is not the sales page. We earn money when you buy through our order links.
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