L-Lysine Powder Ingredients & Drug Interactions
by TerraVita Premium Collection
What is this page for?
First and foremost: checking L-Lysine Powder 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 Powder is a dietary supplement by TerraVita Premium Collection 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, Powder. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against L-Lysine Powder by TerraVita Premium Collection
Ask about any prescription or over-the-counter medication and we check it for interactions with L-Lysine Powder by TerraVita Premium Collection — 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 Powder by TerraVita Premium Collection
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 is a straightforward single-ingredient supplement: L-lysine, an amino acid your body uses for protein and tissue repair. There are no inactive fillers or other ingredients listed, so you're getting lysine and nothing else in powder form.
Does it work?
Moderate evidence
L-lysine is possibly effective for cold sores (herpes labialis), meaning some evidence supports its use, though more research would help confirm how well it works. For other uses — child growth, pressure ulcers, and diabetic foot ulcers — the evidence we hold is insufficient to rate whether it actually helps.
If cold sores are what you're after, lysine has a reasonable evidence base; for other conditions, talk it over with your doctor or pharmacist to see if it's right for you.
How safe is it?
Well-documented data
L-lysine is generally well tolerated at normal doses, but higher amounts may cause stomach upset, and we don't have solid long-term safety data from studies. The supplement form hasn't been well studied in pregnancy, so if you're pregnant, check with your doctor first — food sources of lysine are fine, but supplement doses are less certain.
If you're breastfeeding, there isn't enough reliable information to know whether it's safe, so caution is advised and your doctor or pharmacist can help you decide. The most common side effects from oral lysine are stomach pain, diarrhea, and indigestion.
There is one case report of oral lysine linked to kidney inflammation that progressed to chronic kidney problems, though this is extremely rare.
Meds to double-check
Minor interactions only
If you take a 5-HT4 agonist medication, check with your doctor or pharmacist before starting L-lysine, as the supplement may reduce how well the drug works. No other major medication interactions are documented for the ingredients we could check.
The bottom line
Scorecard at a glanceFully disclosed formula with some supporting evidence behind its ingredients' uses. Only minor medication interactions are documented, and safety information is well characterized.
L-lysine powder is possibly effective for cold sores and is generally well tolerated at typical doses. If you're pregnant, breastfeeding, or take any medications — especially 5-HT4 agonists for digestion — talk with your doctor or pharmacist before starting it.
This is especially important if you have a history of stomach upset or kidney concerns, since high doses can cause digestive issues.
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 22, 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 Powder, straight from the product label.
| Brand | TerraVita Premium Collection |
|---|---|
| Barcode (UPC) | 064435148621 |
| Net contents | 4 Ounce(s) |
| Market status | On market |
| Date entered into DSLD | Jun 22, 2023 |
| DSLD ID | 291169 |
| Product type | Amino Acid/protein |
| Supplement form | Powder |
| Dietary claims / uses | All Other, Structure/Function |
| Intended target group(s) | Adult (18 - 50 Years) |
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 Powder by TerraVita Premium Collection, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| L-Lysine, Powder | 1000 mg | -- |
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
A Dietary Supplement
Brand IP Statement(s)
Copyright 2005 TerraVita - Distributed by ZooScape LLC, All Rights Reserved.
Suggested/Recommended/Usage/Directions
Directions Stir 1/4 of a teaspoon into a glass of water and consume 3 times daily, with meals.
General Statements
TerraVita is an exclusive line of premium natural products that use the finest, purest and most potent ingredients in the world. TerraVita's hallmarks are the highest possible standards of purity, potency, stability and freshness. All products are prepared with the greatest quality control, from raw materials through the entire manufacturing process, right up to the moment your product is sealed for freshness and shipped to you.
Please recycle!
FDA Disclaimer Statement
Statements not evaluated by FDA. Product not intended to diagnose, treat, cure, or prevent any disease.
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
L-Lysine Powder by TerraVita Premium Collection 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 Powder by TerraVita Premium Collection
This is the 1 active ingredient this product is made of. Select it to open its full monograph.
Serving size0.25 Teaspoon(s) Dosage formPowder Servings per container113 Amounts shown are per serving.
L-Lysine, Powder
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, Powder monograph & interactionsL-Lysine Powder by TerraVita Premium Collection Drug Interactions
HelloPharmacist Interaction Report
L-Lysine Powder by TerraVita Premium Collection interacts with one medication type through a minor effect on how your body processes it.
L-lysine may reduce the effects of 5-HT4 agonists — a class of medications sometimes used for certain digestive conditions. Animal research suggests lysine acts as a partial blocker of serotonin receptor 4, the same target these drugs work on, which could theoretically make them less effective.
Read the full breakdown — every affected drug type, severity by severity
Although this is rated a minor interaction, if you take a 5-HT4 agonist, it's worth checking with your doctor or pharmacist before starting lysine to see if your medication needs any timing adjustments or monitoring. Altogether, these interactions span 1 individual medication.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against L-Lysine Powder?
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 Powder interact with 1 drug. Click any drug to see the details.
1 of the 1 ingredient in L-Lysine Powder interact with drugs. Each result below shows which ingredient is responsible. L-Lysine, Powder
TegaserodZelnorm
How Tegaserod interacts with L-Lysine Powder — through 1 ingredient. Tap an ingredient for the detail:
L-lysine, Powder5-ht4 Agonists Minor
Interaction Summary
Theoretically, lysine may reduce the effects of 5-HT4 agonists.
Read the full L-lysine, Powder + Tegaserod interactionEach ingredient & the kinds of drugs it affects
For each ingredient in L-Lysine Powder 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, Powder
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 Powder, from the product label.
TerraVita Premium Collection
See all TerraVita Premium Collection products- Name
- TerraVita Fine Whole Herbs
- City
- Brampton
- State
- Ontario
L-Lysine Powder by TerraVita Premium Collection: Common Questions
Does L-Lysine Powder by TerraVita Premium Collection interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
Will L-lysine help my cold sores?
What side effects should I watch for?
Is it safe to take L-lysine while pregnant?
Can I take it while breastfeeding?
Why is there no filler or other ingredients in this powder?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if L-Lysine Powder 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 Powder’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 Powder'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