Compare every L-Citrulline product across UK retailers on Suppio, ranked by true value - price per active dose, not pack size. Prices refreshed daily.
Amino acid that boosts nitric oxide production and reduces muscle fatigue
We rank L-Citrulline by price per 6g - 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-Citrulline is an amino acid, which is a basic building block that the body uses to make proteins. It is a non-essential amino acid, meaning your body can produce some of it on its own, but it can also be taken as a supplement.
Why it's used
It is primarily used to increase the production of nitric oxide, a gas in the body that relaxes blood vessels to improve blood flow. This process helps to reduce muscle fatigue and can improve overall exercise performance.
How it's made
To create the supplement, manufacturers typically use a process called fermentation. This involves using specific bacteria or microorganisms to break down a sugar source into the amino acid powder, which is then purified and dried for use in capsules or powders.
What it typically costs
This ingredient sits in a mid-range price category. This is because the fermentation process required to produce high-purity powder is more complex than simple extraction, but there is enough global supply and competition to prevent it from becoming a luxury-priced 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 boosts nitric oxide production and reduces muscle fatigue
How does Suppio calculate the best-value L-Citrulline?
We rank L-Citrulline by price per 6g - 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-Citrulline prices updated?
Prices across our retailer network are refreshed at least daily.