Compare every L-Arginine product across UK retailers on Suppio, ranked by true value - price per active dose, not pack size. Prices refreshed daily.
Amino acid that is a precursor to nitric oxide, supports blood flow
We rank L-Arginine by price per gram of active ingredient - not by pack size - so a bigger tub with a worse price per dose can't outrank a smaller one that's actually cheaper.
What it is
L-Arginine is an amino acid, which is a basic building block that the body uses to make proteins. It acts as a precursor to nitric oxide, meaning it is a substance the body uses to produce that specific gas.
Why it's used
It is primarily used to support blood flow. By helping the body create nitric oxide, it allows blood vessels to relax and widen, which can improve the delivery of oxygen and nutrients throughout the body.
How it's made
To create the supplement, manufacturers typically use a process called fermentation. This involves using specific bacteria to break down a sugar source into the amino acid, which is then filtered, purified, and dried into a powder for capsules or tablets.
What it typically costs
This ingredient is generally mid-range in price. This is because the fermentation process required to produce it at scale is more complex than simple extraction, but there is enough global supply and competition to keep it from being a luxury item.
Suppio matches identical products across UK retailers by barcode, then ranks by price per active dose rather than sticker price. Value rankings only ever include listings Suppio has independently verified against the live retailer page - unverified data is shown on each product’s own page but excluded from ranking.
Prices across our retailer network are refreshed at least daily.
Amino acid that is a precursor to nitric oxide, supports blood flow
How does Suppio calculate the best-value L-Arginine?
We rank L-Arginine by price per gram of active ingredient - not by pack size - so a bigger tub with a worse price per dose can't outrank a smaller one that's actually cheaper.
Are these prices verified?
Suppio matches identical products across UK retailers by barcode, then ranks by price per active dose rather than sticker price. Value rankings only ever include listings Suppio has independently verified against the live retailer page - unverified data is shown on each product’s own page but excluded from ranking.
How often are L-Arginine prices updated?
Prices across our retailer network are refreshed at least daily.