When to take it
Evening or after training.
← All supplements
Amino acidsWeak evidence
L-ornithine
Also known as: ornithine
Ornithine is a non-essential amino acid of the urea cycle, which helps the body clear ammonia. It is often combined with arginine.
What it is used for
- Reduced fatigue during prolonged exercise – weak evidence
- Better sleep quality and less stress – weak evidence from small studies
- Raising growth hormone – weak evidence, no proven effect on muscle
Forms and how they differ
L-ornithine HCl
standard form in capsules and powder
ornithine aspartate (LOLA)
used medically in liver disease
arginine combinations
often in one product, read the label
Pairs well with
Arginine, citrulline.
Do not combine / separate
Avoid large single doses – they can cause digestive upset.
Watch out for
Consult your doctor or pharmacist if you are pregnant, breastfeeding, have kidney or liver disease or take any medicines.
Safety
Do not exceed the label dose.
Practical tip
Ornithine is not a muscle-building shortcut – for fatigue, look at sleep and diet first.
Products containing L-ornithine 4
L-arginine + L-citrulline + L-ornithinepowder
L-ornithine 500 mg500 mg / capsule
L-ornithine L-ornithine hydrochloride 500 mgL-ornithine hydrochloride · 500 mg / capsule
L-ornithinefree form
How to read the evidence rating
Strong evidenceModerate evidenceWeak evidenceNo evidence
Strong = several good human studies or official recommendations; moderate = promising but smaller studies; weak = few studies or mixed results; no evidence = claims not confirmed.
Combination check
Select the supplements you take and, if relevant, your medicines. We show what interferes, what needs a time gap and what to watch out for.
Check L-ornithine with othersWhich supplements do you actually need?
Fénix Methode picks them from your blood results and schedules when to take what – no needless purchases.
From the same group
Acetyl-L-carnitineWeak evidenceAlmond proteinWeak evidenceAmino acid complexWeak evidenceBCAAWeak evidenceBeef proteinModerate evidenceCaseinStrong evidence
Important notice
This information is educational and does not replace advice from a doctor or pharmacist. We do not give medicine dosages. Supplements are no substitute for a varied diet; if pregnant, breastfeeding, ill or on medication, consult a doctor first.