L-Ornithine 667 mg Ingredients & Drug Interactions
by Source Naturals
What is this page for?
First and foremost: checking L-Ornithine 667 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 667 mg is a dietary supplement by Source Naturals with 2 active ingredients. 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 667 mg by Source Naturals
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, at 667 mg per capsule. The capsule itself is made from gelatin, with silica and magnesium stearate added as inactive ingredients to help with manufacturing and consistency.
Does it work?
Moderate evidence
L-ornithine is possibly effective for athletic performance. For dry skin, insomnia, and periodontitis (gum disease), the evidence we hold is insufficient to rate whether it works.
That means the research isn't settled yet — you may see claims out there, but we don't have reliable data backing those uses.
How safe is it?
Some data gaps
L-ornithine is generally well tolerated in the short term, though long-term safety hasn't been well studied. The safety data advises against use during pregnancy and while breastfeeding — there isn't enough information to know it's safe in those situations.
Talk with your doctor or pharmacist if you're pregnant, planning to become pregnant, or nursing before starting this supplement.
Meds to double-check
No known interactions
No interactions are documented in our data for L-ornithine. That said, always confirm with your own doctor or pharmacist before adding any new supplement to your medications.
The bottom line
Scorecard at a glanceFully disclosed formula with some supporting evidence for its stated purpose. No medication interactions are currently documented, and some safety-information gaps remain.
If you're an athlete looking at L-ornithine for performance, it's worth a conversation with your doctor or pharmacist first — especially if you take any regular medications or have kidney or liver concerns. Anyone pregnant or breastfeeding should avoid it until they've checked with their healthcare provider.
No documented interactions appear in our data, but that's not a blanket green light to mix with every drug.
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 Aug 23, 2023.
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 667 mg, straight from the product label.
| Brand | Source Naturals |
|---|---|
| Barcode (UPC) | 021078016427 |
| Net contents | 100 Capsule(s) |
| Market status | On market |
| Date entered into DSLD | Aug 23, 2023 |
| DSLD ID | 295949 |
| Product type | Amino Acid/protein |
| Supplement form | Capsule |
| Dietary claims / uses | Nutrient, All Other, Structure/Function |
| Intended target group(s) | Adult (18 - 50 Years), Gluten Free, Dairy Free, Sugar 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 667 mg by Source Naturals, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Calories | 10 Calorie(s) | -- |
| Protein | 2 Gram(s) | 4% |
| L-Ornithine | 2 Gram(s) | -- |
Other ingredients: Gelatin, Silica, 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.
FDA Statement of Identity
Amino Acid Supplement
Formulation
Free-Form
Hypoallergenic: contains no yeast, dairy, egg, gluten, corn, soy or wheat.
Hypoallergenic: contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.
Formula
L-Ornithine, a free-form crystalline amino acid is a precursor of arginine, which is necessary for the synthesis of creatine, an important energy provider for muscles. In addition, L-ornithine is a key compound in the urea cycle, one of the body's main processes for eliminating ammonia.
Suggested/Recommended/Usage/Directions
Suggested Use: 1 to 3 capsules 1 to 2 times daily. Use before exercise or at bedtime with plenty of water.
Precautions
Note: If you are pregnant, may become pregnant, or breastfeeding, consult your health care professional before using this product.
Do not use if either tamper-evident seal is broken or missing.
Keep out of the reach of children.
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.
Brand IP Statement(s)
Copyright Source Naturals, Inc
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
L-Ornithine 667 mg by Source Naturals 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 667 mg by Source Naturals
These are the 2 active ingredients this product is made of. Select any to open its full monograph.
Serving size1 Capsule(s) Dosage formCapsule Servings per container33 Amounts shown are per serving.
Most supplement products combine several ingredients, and a medication can interact with the product through any one of them. Each ingredient below shows whether it has known drug interactions.
Protein
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, Silica, Magnesium Stearate. These complete the product’s ingredient list but are not active constituents.
L-Ornithine 667 mg by Source Naturals Drug Interactions
We don’t currently list any known drug interactions for the mapped ingredients in L-Ornithine 667 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 667 mg, from the product label.
Source Naturals
- Name
- Source Naturals, Inc.
- Street Address
- P. O. Box 2118
- City
- Santa Cruz
- State
- CA
- ZipCode
- 95062
- Web Address
- www.sourcenaturals.com
L-Ornithine 667 mg by Source Naturals: Common Questions
Does L-Ornithine 667 mg by Source Naturals interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
What is L-ornithine and what does it do?
Is L-ornithine safe to take while I'm pregnant or breastfeeding?
Are there any side effects I should know about?
How long can I safely take L-ornithine?
Does it interact with medications?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if L-Ornithine 667 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 667 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 667 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