L-Ornithine 500 mg Ingredients & Drug Interactions
by NOW
What is this page for?
First and foremost: checking L-Ornithine 500 mg 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 500 mg is a dietary supplement by NOW 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 500 mg by NOW
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 your body makes naturally. The capsule also holds inactive ingredients (cellulose, rice flour, and magnesium stearate) that help hold it together and make it easier to swallow.
Does it work?
Couldn't assess
L-ornithine appears possibly effective for athletic performance based on the evidence we have. For dry skin, insomnia, and periodontitis (gum disease), the evidence isn't strong enough to say whether it works — the data rates these uses as having insufficient reliable evidence.
You'd be using this product in an area where proof is still limited.
How safe is it?
Some data gaps
L-ornithine is generally well tolerated in the short term, but long-term safety hasn't been well studied, so we don't know how it holds up over months or years. The safety data advises against use during pregnancy and while breastfeeding because there isn't enough evidence to know it's safe in those situations.
Talk with your doctor or pharmacist before using it if you're pregnant, planning to become pregnant, or nursing.
Meds to double-check
No known interactions
No interactions are documented for L-ornithine in our data.
The bottom line
Scorecard at a glanceFully disclosed formula with no assessable stated purpose. No medication interactions are currently documented, and some safety-information gaps remain.
L-ornithine might appeal to you if you're looking to support athletic performance, since there's some evidence for that. Just know the data on other uses is thin, and we don't have long-term safety information.
If you're pregnant, breastfeeding, or on medications, check in with your doctor or pharmacist before starting.
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 Nov 24, 2015.
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 500 mg, straight from the product label.
| Brand | NOW |
|---|---|
| Barcode (UPC) | 733739001207 |
| Net contents | 60 Veg Capsule(s) |
| Market status | On market |
| Date entered into DSLD | Nov 24, 2015 |
| DSLD ID | 53383 |
| Product type | Amino Acid/protein |
| Supplement form | Capsule |
| Dietary claims / uses | All Other, Structure/Function |
| Intended target group(s) | Vegan, Vegetarian, Adult (18 - 50 Years), Gluten Free, Dairy Free |
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 500 mg by NOW, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| L-Ornithine | 1.5 Gram(s) | -- |
Other ingredients: Cellulose, Rice Flour, Magnesium Stearate
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.
Suggested/Recommended/Usage/Directions
Suggested Usage: Take 3 capsules daily with juice or water on an empty stomach.
General Statements
Ornithine is a non-essential amino acid that plays a central role in the urea cycle, functioning along with Arginine and Citrulline to rid the body of ammonia, a byproduct of protein metabolism.* Because Ornithine is converted into Arginine, it can help to maintain healthy Arginine levels in the body.* Ornithine can also be converted into other amino acids, such as citrulline, proline, and glutamate, as well as creatine, an important muscular energy source.*
CAPSULE SIZE
Fitness Amino Acid*
Healthy Protein Metabolism*
Amino Acids
Family owned since 1968.
Natural color variation may occur in this product.
Please Recycle.
FDA Disclaimer Statement
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
Precautions
Caution: For adults only.
Consult physician if pregnant/nursing, taking medication, or have a medical condition.
Keep out of reach of children.
Do Not Eat Freshness Packet. Keep in Bottle.
Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.
FDA Statement of Identity
A Dietary Supplement
Formulation
Vegetarian/Vegan
Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients.
Seals/Symbols
Non-GMO
GMP QUALITY ASSURED
Storage
Store in a cool, dry place after opening.
General
CODE 0120B V4
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
L-Ornithine 500 mg by NOW 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 500 mg by NOW
This is the 1 active ingredient this product is made of. Select it to open its full monograph.
Serving size3 Veg Capsule(s) Dosage formCapsule Servings per container20 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: Cellulose, Rice Flour, Magnesium Stearate. These complete the product’s ingredient list but are not active constituents.
L-Ornithine 500 mg by NOW Drug Interactions
We don’t currently list any known drug interactions for the mapped ingredients in L-Ornithine 500 mg. 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 500 mg, from the product label.
NOW
See all NOW products- Name
- NOW Foods
- Street Address
- 395 S. Glen Ellyn Rd.
- City
- Bloomingdale
- State
- IL
- ZipCode
- 60108
- Web Address
- nowfoods.com
L-Ornithine 500 mg by NOW: Common Questions
Does L-Ornithine 500 mg by NOW 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 workouts or athletic performance?
Can I take this if I'm pregnant or breastfeeding?
Will L-ornithine help my insomnia or dry skin?
Is this safe to take long-term?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if L-Ornithine 500 mg 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 500 mg’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 500 mg'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