L-Lysine Capsules Ingredients & Drug Interactions
What is this page for?
First and foremost: checking L-Lysine Capsules 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-Lysine Capsules is a dietary supplement by DaVinci Laboratories with 1 active ingredient. Its ingredients are commonly taken for cold sores (herpes labialis), genital herpes outbreaks, supporting protein and collagen formation.Based on those ingredients, 1 medication has a known interaction with it, the most serious rated minor. The ingredients most likely to interact are L-Lysine. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against L-Lysine Capsules by DaVinci Laboratories
Ask about any prescription or over-the-counter medication and we check it for interactions with L-Lysine Capsules by DaVinci Laboratories — and tell you which ingredient is responsible.
AI summaries are generated from our interaction database for education only — always confirm with your pharmacist. How we use AI
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HelloPharmacist Scorecard of L-Lysine Capsules by DaVinci Laboratories
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
L-Lysine Capsules contains one active ingredient: L-lysine, an amino acid your body needs to build protein and manage certain immune functions. The capsule also holds inactive ingredients — cellulose, microcrystalline cellulose, and leucine — which are binding and flow agents.
Does it work?
Moderate evidence
L-lysine is possibly effective for cold sores (herpes labialis). For other uses listed — child growth, pressure ulcers, and diabetic foot ulcers — there isn't enough reliable evidence yet to say whether it works.
How safe is it?
Well-documented data
L-lysine is generally well tolerated at normal doses. At high amounts, it may cause stomach upset, including abdominal pain, diarrhea, and indigestion.
Long-term safety at high doses hasn't been well studied. For pregnancy and breastfeeding, there isn't enough data on supplement use to know either way — getting lysine from food is fine, but if you're pregnant or nursing and thinking about taking a supplement, talk with your doctor first.
Meds to double-check
Minor interactions only
If you take a 5-HT4 agonist (a drug for certain digestive or gut disorders), this supplement may reduce how well it works. Check with your doctor or pharmacist before combining them.
The bottom line
Scorecard at a glanceFully disclosed formula with some supporting evidence for its stated purpose. Only minor medication interactions are documented, and safety information is well characterized.
L-lysine is a straightforward, single-ingredient supplement mainly used for cold sores, where the evidence suggests it may help. It's generally well tolerated, but steer clear of very high doses to avoid stomach upset.
If you take a 5-HT4 agonist, check with your doctor or pharmacist first — this supplement may weaken its effect.
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 Dec 14, 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-Lysine Capsules, straight from the product label.
| Brand | DaVinci Laboratories |
|---|---|
| Barcode (UPC) | 026664002167 |
| Net contents | 90 Capsule(s) |
| Market status | On market |
| Date entered into DSLD | Dec 14, 2023 |
| DSLD ID | 303968 |
| Product type | Amino Acid/protein |
| Supplement form | Capsule |
| Dietary claims / uses | All Other, Structure/Function |
| Intended target group(s) | Vegetarian, Adult (18 - 50 Years), Gluten 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-Lysine Capsules by DaVinci Laboratories, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| L-Lysine | 500 mg | -- |
Other ingredients: Cellulose, Microcrystalline Cellulose, Leucine
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.
General Statements
Truth We pledge total truth in labeling. Our family of products contain only the purest and most potent ingredients. Guaranteed.
Formulation
Color of this product may vary due to color variations of the natural ingredients.
Vegetarian
Soy Free Gluten Free
Precautions
Warning: If pregnant or nursing, consult your healthcare practitioner before taking this product.
Keep out of reach of children.
To obtain product information or report a serious adverse event, call 1-800-325-1776.
Storage
Store in a cool, dry place.
FDA Statement of Identity
A Dietary Supplement
Suggested/Recommended/Usage/Directions
Suggested Use: As a dietary supplement take 1 capsule, 1 to 3 times daily between meals, or as directed by your healthcare practitioner.
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
L-Lysine Capsules by DaVinci Laboratories 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-Lysine Capsules by DaVinci Laboratories
This is the 1 active ingredient this product is made of. Select it to open its full monograph.
Serving size1 Vegetarian Capsule(s) Dosage formCapsule Servings per container90 Amounts shown are per serving.
L-Lysine
Interacts with1 drug
Lysine is an essential amino acid your body cannot make on its own, so it must come from food or supplements. People most often take extra lysine to t...
L-Lysine monograph & interactionsOther (inactive) ingredients: Cellulose, Microcrystalline Cellulose, Leucine. These complete the product’s ingredient list but are not active constituents.
L-Lysine Capsules by DaVinci Laboratories Drug Interactions
HelloPharmacist Interaction Report
L-Lysine Capsules by DaVinci Laboratories has one documented interaction.
Through its L-lysine content, it may reduce the effects of 5-HT4 agonists (a class of drugs that work on serotonin receptors in the gut). The concern is Minor in severity — animal research suggests lysine acts as a partial blocker of these receptors and can dampen their action.
Read the full breakdown — every affected drug type, severity by severity
Altogether, these interactions span 1 individual medication. If you take a 5-HT4 agonist (used for some digestive conditions), run it through the checker below or talk with your doctor or pharmacist before starting this supplement.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against L-Lysine Capsules?
Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.
Go to the checkerIngredients driving the most interactions
Individual Drug Interactions
The ingredients in L-Lysine Capsules interact with 1 drug. Click any drug to see the details.
1 of the 1 ingredient in L-Lysine Capsules interact with drugs. Each result below shows which ingredient is responsible. L-Lysine
TegaserodZelnorm
How Tegaserod interacts with L-Lysine Capsules — through 1 ingredient. Tap an ingredient for the detail:
L-lysine5-ht4 Agonists Minor
Interaction Summary
Theoretically, lysine may reduce the effects of 5-HT4 agonists.
Read the full L-lysine + Tegaserod interactionEach ingredient & the kinds of drugs it affects
For each ingredient in L-Lysine Capsules with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.
L-Lysine
5-Ht4 Agonists
Theoretically, lysine may reduce the effects of 5-HT4 agonists.
Animal research suggests that L-lysine is a partial serotonin receptor 4 (5-HT4) antagonist and inhibits diarrhea induced by the 5-HT4 agonist, 5-hydroxytryptophane.
Brand information
Manufacturer and brand details for L-Lysine Capsules, from the product label.
DaVinci Laboratories
See all DaVinci Laboratories products- Name
- DaVinci Laboratories a division of FoodScience LLC
- Street Address
- 929 Harvest Lane
- City
- Williston
- State
- VT
- ZipCode
- 05495
- Phone Number
- 1-800-325-1776
- Web Address
- www.davincilabs.com
L-Lysine Capsules by DaVinci Laboratories: Common Questions
Does L-Lysine Capsules by DaVinci Laboratories interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
Does L-lysine really help with cold sores?
What side effects should I watch for?
Is it safe to take while pregnant?
Can I take this while breastfeeding?
How much L-lysine is in each capsule?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if L-Lysine Capsules 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-Lysine Capsules’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Sources & How We Checked
L-Lysine Capsules'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 7 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.
Lysine 7 references
- Thein DJ, Hurt WC. Lysine as a prophylactic agent in the treatment of recurrent herpes simplex labialis. Oral Surg Oral Med Oral Pathol 1984;58:659-66. PubMed
- McCune MA, Perry HO, Muller SA, O'Fallon WM. Treatment of recurrent herpes simplex infections with L-lysine monohydrochloride. Cutis 1984;34:366-73.
- DiGiovanna JJ, Blank H. Failure of lysine in frequently recurrent herpes simplex infection. Treatment and prophylaxis. Arch Dermatol 1984;120:48-51. DOI
- Milman N, Scheibel J, Jessen O. Lysine prophylaxis in recurrent herpes simplex labialis: a double-blind, controlled crossover study. Acta Derm Venereol 1980;60:85-7.
- Griffith RS, Walsh DE, Myrmel KH, et al. Success of L-lysine therapy in frequently recurrent herpes simplex infection. Treatment and prophylaxis. Dermatologica 1987;175:183-90. DOI
- Lo JC, Chertow GM, Rennke H, Seifter JL. Fanconi's syndrome and tubulointerstitial nephritis in association with L-lysine ingestion. Am J Kidney Dis 1996;28:614-7. PubMed
- Smriga M, Torii K. L-Lysine acts like a partial serotonin receptor 4 antagonist and inhibits serotonin-mediated intestinal pathologies and anxiety in rats. Proc Natl Acad Sci U S A. 2003 Dec 23;100(26):15370-5.
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