L-Ornithine Ingredients & Drug Interactions
by Twinlab
What is this page for?
First and foremost: checking L-Ornithine against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.
Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy
L-Ornithine is a dietary supplement by Twinlab with 1 active ingredient. Its ingredients are commonly taken for athletic performance and recovery, reducing fatigue, sleep and stress support.We don’t currently list a known drug interaction for its mapped ingredients — but that doesn’t guarantee none exist, so always confirm with your pharmacist.
HelloPharmacist Scorecard of L-Ornithine by Twinlab
Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.
What’s inside
Full disclosure
This product contains one active ingredient: L-ornithine, an amino acid. The capsule also holds gelatin, medium chain triglycerides, magnesium stearate, and silica as inactive ingredients.
Does it work?
Moderate evidence
The evidence shows L-ornithine is possibly effective for athletic performance. For dry skin, insomnia, and periodontitis (gum inflammation), the evidence isn't strong enough to rate — we don't have reliable data saying whether it works for those uses.
How safe is it?
Some data gaps
L-Ornithine is generally well tolerated over the short term, but we don't have good information about long-term safety. The safety data advises against using it during pregnancy or while breastfeeding because there isn't enough evidence to know it's safe in those situations.
Meds to double-check
No known interactions
No interactions are documented in our data for L-ornithine with the medications we checked.
The bottom line
Scorecard at a glanceFully disclosed formula with some supporting evidence behind its ingredients' uses. No medication interactions are currently documented, and some safety-information gaps remain.
If you're interested in L-ornithine for athletic performance, the evidence is modest but exists. For other uses, we don't have solid data yet.
Since long-term safety isn't well studied and pregnancy and breastfeeding safety data are limited, talk it over with your own doctor or pharmacist to see if it fits your situation.
Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI
Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Jun 16, 2022.
This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed
General information
Key facts about L-Ornithine, straight from the product label.
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.
Supplement Facts
The label details for L-Ornithine by Twinlab, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| L-Ornithine | 500 mg | -- |
Other ingredients: Gelatin, Medium Chain Triglycerides, Magnesium Stearate, Silica
Tap any ingredient to jump to its full detail below.
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Formulation
Well tolerated by the most highly allergic individuals.
No tablet binders, coatings or colorings. No added flavorings, salt, artificial sweeteners, preservatives or salicylates.
Twinlab L-Ornithine Capsules are easier to swallow and assimilate. Best if used by date shown on bottle.
Storage
Keep tightly closed in a cool, dry place.
Formula
Free Form Amino Acid
L-Ornithine is an amino acid.
FDA Statement of Identity
Dietary Supplement
Suggested/Recommended/Usage/Directions
Directions: Take one capsule daily or as directed by a healthcare professional. For best results, take on an empty stomach before bedtime.
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
L-Ornithine by Twinlab label
The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.
Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.
View the full label (PDF)The Ingredients in L-Ornithine by Twinlab
This is the 1 active ingredient this product is made of. Select it to open its full monograph.
Serving size1 Capsule(s) Dosage formCapsule Servings per container100 Amounts shown are per serving.
L-Ornithine
No knowninteractions
Ornithine is a non-essential amino acid your body makes naturally as part of the urea cycle, which helps remove ammonia. It is sold as a supplement fo...
L-Ornithine monograph & interactionsOther (inactive) ingredients: Gelatin, Medium Chain Triglycerides, Magnesium Stearate, Silica. These complete the product’s ingredient list but are not active constituents.
L-Ornithine by Twinlab Drug Interactions
We don’t currently list any known drug interactions for the mapped ingredients in L-Ornithine. This doesn’t guarantee none exist — always confirm with your pharmacist before combining a supplement with your medications.
Brand information
Manufacturer and brand details for L-Ornithine, from the product label.
Twinlab
See all Twinlab products- Name
- ISI Brands Inc.
- City
- American Fork
- State
- UT
- ZipCode
- 84003
- Phone Number
- 1-800-645-5626
L-Ornithine by Twinlab: Common Questions
Does L-Ornithine by Twinlab interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
Does L-ornithine actually help with athletic performance?
Can I take L-ornithine if I'm pregnant or breastfeeding?
Is L-ornithine safe to take long-term?
Will L-ornithine help my dry skin or insomnia?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if L-Ornithine is safe with your meds?
Our pharmacists answer your medication & supplement questions — free.
Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.
The Full Monographs Behind L-Ornithine’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Sources & How We Checked
L-Ornithine's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.
- NIH Dietary Supplement Label Database (DSLD) — The official product label on file for this supplement.
- Natural Medicines (Therapeutic Research Center) — Evidence-graded clinical reference behind the ingredient interaction data.
Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.
The 1 references behind this product’s interaction data
Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.
Ornithine 1 reference
- Dietary Supplements: What You Need to Know — NIH Office of Dietary Supplements Source
Parts of this content are provided by the Therapeutic Research Center, LLC.
DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.
© 2021 Therapeutic Research Center, LLC