Compare every L-Ornithine product across UK retailers on Suppio, ranked by true value - price per active dose, not pack size. Prices refreshed daily.
Non-essential amino acid involved in the urea cycle, supports ammonia clearance and sleep quality
We rank L-Ornithine 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.
L-Ornithine is a non-essential amino acid, which is a building block for proteins that your body can produce on its own. It plays a key role in the urea cycle, a process where the body converts ammonia (a toxic byproduct of protein breakdown) into urea so it can be safely removed through urine.
It is primarily used to help the body clear ammonia more efficiently and to support better sleep quality.
Commercial L-Ornithine is typically produced through a process called fermentation. This involves using specific bacteria or microorganisms that are fed a nutrient broth to naturally produce the amino acid, which is then filtered, purified, and dried into a powder for capsules or tablets.
This ingredient is generally mid-range in price. This is because the fermentation process required to produce it is more complex than the simple extraction used for basic amino acids, but there is enough global supply to keep it from being a luxury item.
| Purpose | Typical studied dose | Evidence |
|---|---|---|
| improve certain metabolic diseases | 398 to 10,989 mg per person per day | emerging |
| support liver function and wound recovery | not specified | limited |
| relieve stress and improve sleep quality related to fatigue | not specified | emerging |
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.
Non-essential amino acid involved in the urea cycle, supports ammonia clearance and sleep quality
We rank L-Ornithine 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.
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.