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Dietary supplement

Arnica Ingredients & Drug Interactions

by L.A. Naturals

Arnica label
See full label image
Liquid Category: Botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Arnica 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

The interaction bottom line Most serious interaction: Moderate

Arnica is a dietary supplement by L.A. Naturals with 1 active ingredient. Its ingredients are commonly taken for bruising, muscle soreness, joint pain (osteoarthritis).Based on those ingredients, 122 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are selectively imported Arnica montana. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Arnica by L.A. Naturals

Ask about any prescription or over-the-counter medication and we check it for interactions with Arnica by L.A. Naturals — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Arnica by L.A. 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.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Jul 16, 2026

What’s inside

Low disclosure
Ingredient Transparency · database check
Low

Most active ingredients don't disclose an individual amount — you can't tell how much of each you're getting.

Why this rating?
  • The label discloses an exact amount for 0 of its 1 active ingredient.

This product contains one active ingredient: selectively imported Arnica montana, a flowering plant traditionally used for inflammation and bruising. It's suspended in a base of grain alcohol and deionized water.

Does it work?

Moderate evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Moderate

Some clinical evidence supports this product's ingredients for its stated purpose, but it isn't conclusive.

Why this rating?
  • The label markets this product for: Soothes muscle and nerve discomfort.
  • We looked for evidence on: Bruises, Exercise-induced muscle soreness, Osteoarthritis, Postoperative pain, Postoperative swelling, Muscle strain — and 3 related terms.
  • The strongest evidence on file: Arnica is rated "Possibly Effective" for Osteoarthritis (Natural Medicines).
  • Also on file: Arnica is rated "Insufficient Reliable Evidence To Rate" for Exercise-induced muscle soreness, Postoperative pain, Bruises, Postoperative swelling.

Arnica has possibly effective evidence for osteoarthritis. For acne, breast cancer-related hot flashes, postoperative pain, and dry eye, the evidence we hold isn't sufficient to rate whether it works.

If you're considering it for one of those other uses, the data doesn't yet support a clear answer.

The evidence, ingredient by ingredient Arnica

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

This product is a liquid form, and the safety picture depends heavily on how you use it. Topical and homeopathic arnica are generally well tolerated, though contact dermatitis or skin irritation can occur.

Undiluted arnica should never be swallowed—oral arnica at full strength is unsafe and can cause serious toxicity, including bleeding, stomach upset, muscle paralysis, abnormal heart rhythm, and in rare cases, organ failure or death. The safety data advises against use during pregnancy and while breastfeeding.

Side effects, ingredient by ingredient Arnica

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Arnica.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs.
  • For scale: 122 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Blood thinners and antiplatelet drugs (such as warfarin, aspirin, or clopidogrel) may have additive effects with arnica, raising your bleeding risk—though this risk is lower with homeopathic arnica preparations. Talk with your doctor or pharmacist before combining either type of medication with this product.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFormula with limited ingredient disclosure with some supporting evidence for its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

Arnica may help with osteoarthritis symptoms when used topically or as a homeopathic preparation. If you take blood thinners or antiplatelet drugs, check with your doctor or pharmacist before starting.

Never swallow undiluted arnica, and avoid this product during pregnancy and breastfeeding.

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 Jul 25, 2014.

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

At a glance

General information

Key facts about Arnica, straight from the product label.

Brand L.A. Naturals
Barcode (UPC) 641356037212
Net contents 1 fl. Oz.; 30 mL
Market status On market
Date entered into DSLD Jul 25, 2014
DSLD ID 35012
Product type Botanical
Supplement form Liquid
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Kosher
From the 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 Arnica by L.A. Naturals, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
1 Fluid Ounce
Maximum serving Sizes:
1 Fluid Ounce
UPC/BARCODE
641356037212
IngredientAmount% DV
selectively imported Arnica montana0 NP--

Other ingredients: in a base of Grain Alcohol, deionized Water

Tap any ingredient to jump to its full detail below.

Label statements
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.
Formula

SINGLE HERB IN ALCOHOL

General Statements

Soothes Muscle & Nerve Discomfort

Rev: 101002 Plant # K-0001604

MADE IN THE USA

FAST ABSORPTION MEDICINAL BOTANICALS

Suggested/Recommended/Usage/Directions

SUGGESTED USE: Apply externally as needed.

Shake well before using.

Precautions

WARNINGS: Do not take during pregnancy.

Keep out of the reach of children.

Seals/Symbols

L.a.(TM)

K PARVE

FDA Statement of Identity

DIETARY SUPPLEMENT

FDA Disclaimer Statement

These statements have not been evaluated by the FDA. This product is not intended to diagnose, cure, treat, or prevent any disease.

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Arnica by L.A. Naturals label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Arnica label

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)
What’s inside

The Ingredients in Arnica by L.A. Naturals

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size1 Fluid Ounce Dosage formLiquid Amounts shown are per serving.

Selectively imported Arnica montana

Interacts with
122 drugs
0 NP per serving

Arnica is a daisy-family plant used mainly in topical and homeopathic products for bruising, muscle soreness, and pain. The evidence is mixed and most...

Selectively imported Arnica montana monograph & interactions

Other (inactive) ingredients: In a base of Grain Alcohol, Deionized Water. These complete the product’s ingredient list but are not active constituents.

Interaction report

Arnica by L.A. Naturals Drug Interactions

Want to check YOUR meds against Arnica?

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 checker
122Drugs
122 Moderate

Ingredients driving the most interactions

selectively imported Arnica montana 122

Individual Drug Interactions

The ingredients in Arnica interact with 122 drugs. Click any drug to see the details.

1 of the 1 ingredient in Arnica interact with drugs. Each result below shows which ingredient is responsible. selectively imported Arnica montana

Each ingredient & the kinds of drugs it affects

For each ingredient in Arnica 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.

selectively imported Arnica montana1 drug type · 122 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, arnica might have additive effects with anticoagulant and antiplatelet drugs. Homeopathic arnica preparations are unlikely to have this interaction.
In vitro evidence shows that sesquiterpene lactones in arnica flowers can decrease platelet aggregation. However, this effect has not been reported in humans.

Likelihood Unlikely Evidence D
selectively imported Arnica montana full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Arnica, from the product label.

L.A. Naturals

See all L.A. Naturals products
Name
Palko Services
Street Address
4991 W. US Hwy 20
City
Michigan City
State
IN
ZipCode
46360
Pharmacist Counseling Corner

Arnica by L.A. Naturals: Common Questions

Does Arnica by L.A. Naturals interact with any medications?
Yes. Based on its ingredients, Arnica has a known interaction with 122 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Arnica contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Can I use this if I take a blood thinner like warfarin or aspirin?
Possibly, but you need to check first. Arnica might add to the blood-thinning effect of these drugs. Talk with your doctor or pharmacist before starting this product.
Is this safe to take while pregnant or breastfeeding?
The safety data advises against it during both pregnancy and breastfeeding. There isn't enough data to know it's safe, so talk with your doctor before use.
What should I never do with this arnica liquid?
Never swallow it undiluted. Undiluted arnica taken by mouth is unsafe and can cause serious toxicity. Use it only as directed on the label.
Does arnica actually work for arthritis pain?
We have possibly effective evidence for osteoarthritis. For other uses like acne, postoperative pain, or hot flashes, the evidence we hold isn't strong enough to say whether it works.
What side effects can topical arnica cause?
When applied to skin, arnica is generally well tolerated, but contact dermatitis and skin irritation can happen in some people.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

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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.

Arnica label
Go deeper

The Full Monographs Behind Arnica’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Arnica

Interacts with 122 drugs

Arnica is a daisy-family plant used mainly in topical and homeopathic products for bruising, muscle soreness, and pain. The evidence is mixed and mostly weak, and undiluted arnica taken by m...

Read the full Arnica monograph →
Sources

Sources & How We Checked

Arnica'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.

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 10 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.

Arnica 10 references
  1. Leung AY, Foster S. Encyclopedia of Common Natural Ingredients Used in Food, Drugs and Cosmetics. 2nd ed. New York, NY: John Wiley & Sons, 1996.
  2. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
  3. Schroder H, Losche W, Strobach H, et al. Helenalin and 11 alpha, 13-dihydrohelenalin, two constituents from Arnica montana L., inhibit human platelet function via thiol-dependent pathways. Thromb Res 1990;57:839-45.
  4. Adkison JD, Bauer DW, Chang T. The effect of topical arnica on muscle pain. Ann Pharmacother 2010;44:1579-84. PubMed
  5. No authors listed. Final report on the safety assessment of Arnica montana extract and Arnica montana. Int.J.Toxicol. 2001;20:1-11. DOI
  6. Karow JH, Abt HP, Frohling M, and Ackermann H. Efficacy of Arnica montana D4 for healing of wounds after Hallux valgus surgery compared to diclofenac. J Altern Complement Med 2008;14:17-25.
  7. Venkatramani DV, Goel S, Ratra V, et al. Toxic optic neuropathy following ingestion of homeopathic medication Arnica-30. Cutan.Ocul.Toxicol. 2013;32:95-97. PubMed
  8. Moghadam BK, Gier R, and Thurlow T. Extensive oral mucosal ulcerations caused by misuse of a commercial mouthwash. Cutis 1999;64:131-134.
  9. Stevinson C, Devaraj VS, Fountain-Barber A, et al. Homeopathic arnica for prevention of pain and bruising: randomized placebo-controlled trial in hand surgery. J R Soc Med 2003;96:60-65. PubMed
  10. Canders CP, Stanford SR, Chiem AT. A dangerous cup of tea. Wilderness Environ Med. 2014 Mar;25(1):111-2. PubMed

See these in context on the Arnica monograph →

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

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