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Dietary supplement

Krill Oil 500 mg Ingredients & Drug Interactions

by Natures Craft

Krill Oil 500 mg label
See full label image
Softgel Capsule Category: Fat/fatty Acid
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 Krill Oil 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

The interaction bottom line Most serious interaction: Moderate

Krill Oil 500 mg is a dietary supplement by Natures Craft with 1 active ingredient. Its ingredients are commonly taken for heart and cholesterol support, high triglycerides, joint pain and inflammation.Based on those ingredients, 838 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Krill oil. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

Jump to a section

Check Your Meds Against Krill Oil 500 mg by Natures Craft

Ask about any prescription or over-the-counter medication and we check it for interactions with Krill Oil 500 mg by Natures Craft — and tell you which ingredient is responsible.

Pharmacist-reviewed data Checks every ingredient Answer in seconds
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HelloPharmacist Scorecard of Krill Oil 500 mg by Natures Craft

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 Aug 13, 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 4 active ingredients.
  • “Krill oil” is listed as a grouped ingredient — the label gives one combined amount (500 mg) without saying how much of each component you get.

Krill Oil 500 mg contains four active ingredients. The first three — eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), and phospholipids — are the key omega-3 fatty acid compounds extracted from krill.

Astaxanthin is a carotenoid antioxidant (a pigment found naturally in krill) that gives krill its reddish color. The softgels also contain glycerin as an inactive ingredient to help form the capsule.

Does it work?

Couldn't assess
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
Not assessable

This is a single-ingredient Astaxanthin product and its label doesn't state a use — see Astaxanthin's own graded uses on its monograph.

Why this rating?
  • We looked at the product name, claims, and label statements and couldn't find a stated purpose to grade.

The evidence backing astaxanthin for the conditions listed on file — age-related cognitive decline, age-related macular degeneration, aging skin, Alzheimer disease, athletic performance, and carpal tunnel syndrome — is insufficient to rate. We hold no effectiveness data on file for the other three active ingredients in this product.

The evidence, ingredient by ingredient Krill Oil Astaxanthin

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.

Astaxanthin is generally well tolerated in studies, though long-term safety data are limited. The most common side effects in trials were abdominal pain, diarrhea, and red-colored stools — a harmless discoloration that can occur with some natural pigments.

At higher doses, severe stomach pain has been reported in a small number of people. Because there is not enough safety data, the evidence advises against use during pregnancy and while breastfeeding — talk with your doctor or pharmacist about whether this product is right for you if you're pregnant, planning pregnancy, or nursing.

Side effects, ingredient by ingredient Krill Oil Astaxanthin

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 — Astaxanthin.
  • The most serious interaction on file is rated Moderate.
  • For scale: 672 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.

Before taking this product, check whether you use any medications that are CYP3A4 substrates or CYP2B6 substrates — two large groups of drugs your liver breaks down. These are Moderate interactions based on lab findings, not yet confirmed in people.

Use the interaction checker on this page, then verify your results with your own doctor or pharmacist.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFormula with limited ingredient disclosure with no assessable stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

Krill Oil 500 mg may slow how your liver processes certain medications, a concern that has shown up in lab work but not yet in human studies. If you take any prescription drugs — especially those broken down by the liver — check them against the interaction tool here, then confirm with your own doctor or pharmacist before you start.

Pregnant women and those breastfeeding should avoid it, since safety data are lacking.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 4 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Nov 19, 2021.

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 Krill Oil 500 mg, straight from the product label.

Brand Natures Craft
Net contents 30 Softgel(s)
Market status On market
Date entered into DSLD Nov 19, 2021
DSLD ID 256573
Product type Fat/fatty Acid
Supplement form Softgel Capsule
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years)
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 Krill Oil 500 mg by Natures Craft, 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 Softgel(s)
Maximum serving Sizes:
1 Softgel(s)
Servings per container
30
IngredientAmount% DV
Eicosapentaenoic Acid0 NP--
Docosahexaenoic Acid0 NP--
Phospholipids0 NP--
Astaxanthin0 NP--
Krill oil500 mg--

Other ingredients: Softgel Capsule, Glycerin

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.
Suggested/Recommended/Usage/Directions

Suggested use: As a dietary supplement take one (1) softgel twice a day. For best results take 20-30 minutes before a meal with an 8 oz. glass of water or as directed by your healthcare professional.

Precautions

Caution: Do not exceed recommended dose.

Pregnant or nursing mothers, children under the age of 18, and individuals with a known medical condition should consult a physician before using this or any dietary supplement.

Pregnant or nursing mothers, children under the age of 18, and individuals with a known medical condition should consult a physician before using this or any dietary supplement.

Keep out of the reach of children.

Do not use if safety seal is damaged or missing.

Contains shellfish (krill) derivative.

Storage

Store in a cool, dry place.

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.

General Statements

Nature at its finest

Please recycle.

Formulation

Supports joint health & mobility Supports anti-aging

FDA Statement of Identity

Dietary Supplement

Seals/Symbols

Good Manufacturing Practice Sourced from a GMP Certified Facility Quality Assured

Formulated in the U.S.A.

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

See for yourself

Krill Oil 500 mg by Natures Craft label

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

Krill Oil 500 mg 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 Krill Oil 500 mg by Natures Craft

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

Serving size1 Softgel(s) Dosage formSoftgel Capsule Servings per container30 Amounts shown are per serving.

Krill oil

Interacts with
208 drugs
500 mg per serving

Krill oil is a source of omega-3 fatty acids (EPA and DHA) bound to phospholipids, which may help absorption. It is most studied for lowering triglyce...

Krill oil monograph & interactions
  • › Eicosapentaenoic Acid
  • › Docosahexaenoic Acid
  • › Phospholipids
  • › Astaxanthin

Other (inactive) ingredients: Softgel Capsule, Glycerin. These complete the product’s ingredient list but are not active constituents.

Interaction report

Krill Oil 500 mg by Natures Craft Drug Interactions

Want to check YOUR meds against Krill Oil 500 mg?

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
838Drugs
838 Moderate

Ingredients driving the most interactions

Krill oil 208

Individual Drug Interactions

The ingredients in Krill Oil 500 mg interact with 838 drugs. Click any drug to see the details.

1 of the 1 ingredient in Krill Oil 500 mg interact with drugs. Each result below shows which ingredient is responsible. Krill oil

Each ingredient & the kinds of drugs it affects

For each ingredient in Krill Oil 500 mg 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.

Krill oil2 drug types · 208 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, krill oil may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Taking high doses of omega-3 fatty acids from fish oil can modestly decrease platelet aggregation. Since krill oil also contains these fatty acids, taking high doses of krill oil might also inhibit platelet aggregation. Theoretically, taking high doses of krill oil with antiplatelet or anticoagulant drugs might increase the risk of bleeding. However, the omega-3 content of krill oil is much lower than that of fish oil.

Likelihood Possible Evidence D
Antidiabetes Drugs

Theoretically, taking krill oil with antidiabetes drugs might increase the risk of hypoglycemia.
Some research in animals and humans shows that krill oil might lower blood glucose levels. However, a small study shows that taking krill oil does not reduce blood glucose levels in patients with type 2 diabetes, most of whom were taking antidiabetes drugs.

Likelihood Possible Evidence B
Krill oil full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Krill Oil 500 mg, from the product label.

Natures Craft

See all Natures Craft products
Name
Nature's Craft
City
Monsey
State
NY
ZipCode
10952
Phone Number
408-599-3841
Web Address
shopnaturescraft.com
Pharmacist Counseling Corner

Krill Oil 500 mg by Natures Craft: Common Questions

Does Krill Oil 500 mg by Natures Craft interact with any medications?
Yes. Based on its ingredients, Krill Oil 500 mg has a known interaction with 838 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Krill Oil 500 mg 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.
What's astaxanthin, and why is it in krill oil?
Astaxanthin is a reddish pigment (a carotenoid antioxidant) that occurs naturally in krill. It's one of the active ingredients in this product, though we don't yet have strong evidence for what it does in the body.
Can I take this while pregnant or breastfeeding?
No — there isn't enough safety data, so health evidence advises against use during pregnancy and while breastfeeding. Talk with your doctor or pharmacist about what's safe for you in these situations.
What side effects might I get from astaxanthin?
Most common are abdominal pain, diarrhea, and red-colored stools (which is harmless discoloration). At higher doses, severe stomach pain has occurred in a small number of people. Overall it's well tolerated, though long-term safety isn't as well studied.
Why does the interaction list mention 672 medications?
Astaxanthin may slow how your liver breaks down drugs that depend on two specific enzyme pathways (CYP3A4 and CYP2B6). Those two pathways handle a large number of prescription medications, which is why the total is high. It doesn't mean you take all of them — use the interaction checker to see which ones apply to you.
Is there good evidence that krill oil works for brain health or skin aging?
We don't have reliable evidence on file to rate astaxanthin for age-related cognitive decline, Alzheimer disease, macular degeneration, skin aging, or any of the other conditions listed. The evidence base simply isn't strong enough yet.

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.

Krill Oil 500 mg label
Go deeper

The Full Monographs Behind Krill Oil 500 mg’s Ingredients

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

Herb & supplement monograph

Krill Oil

Interacts with 208 drugs

Krill oil is a source of omega-3 fatty acids (EPA and DHA) bound to phospholipids, which may help absorption. It is most studied for lowering triglycerides and supporting heart health, but t...

Read the full Krill Oil monograph → Herb & supplement monograph

Astaxanthin

Interacts with 671 drugs

Astaxanthin is a reddish carotenoid pigment with strong antioxidant activity in the lab, and it is widely promoted for skin, eye, heart, and exercise benefits. Early human studies are promis...

Read the full Astaxanthin monograph →
Sources

Sources & How We Checked

Krill Oil 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.

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 16 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.

Astaxanthin 3 references
  1. Kupcinskas L, Lafolie P, Lignell A, et al. Efficacy of the natural antioxidant astaxanthin in the treatment of functional dyspepsia in patients with or without Helicobacter pylori infection: A prospective, randomized, double blind, and placebo-controlled
  2. Kistler, A., Liechti, H., Pichard, L., Wolz, E., Oesterhelt, G., Hayes, A., and Maurel, P. Metabolism and CYP-inducer properties of astaxanthin in man and primary human hepatocytes. Arch.Toxicol. 2002;75(11-12):665-675. PubMed
  3. Choi HD, Youn YK, Shin WG. Positive effects of astaxanthin on lipid profiles and oxidative stress in overweight subjects. Plant Foods Hum Nutr. 2011;66:363-369. PubMed

See these in context on the Astaxanthin monograph →

Krill Oil 13 references
  1. Leaf A. On the reanalysis of the GISSI-Prevenzione. Circulation 2002;105:1874-5. PubMed
  2. Connor WE. n-3 Fatty acids from fish and fish oil: panacea or nostrum? Am J Clin Nutr 2001;74;415-6. PubMed
  3. Calder PC. N-3 polyunsaturated fatty acids, inflammation and immunity: pouring oil on troubled waters or another fishy tale? Nutr Res 2001;21:309-41. DOI
  4. Bunea R, El Farrah K, Deutsch L. Evaluation of the effects of Neptune Krill Oil on the clinical course of hyperlipidemia. Altern Med Rev 2004;9:420-8.
  5. Sampalis F, Bunea R, Pelland MF, et al. Evaluation of the effects of Neptune Krill Oil on the management of premenstrual syndrome and dysmenorrhea. Altern Med Rev 2003;8:171-9.
  6. Harris WS, Miller M, Tighe AP, et al. Omega-3 fatty acids and coronary heart disease risk: clinical and mechanistic perspectives. Atherosclerosis 2008;197:12-24. PubMed
  7. Tandy S, Chung RW, Wat E, et al. Dietary krill oil supplementation reduces hepatic steatosis, glycemia, and hypercholesterolemia in high-fat-fed mice. J Agric Food Chem 10-14-2009;57:9339-45. PubMed
  8. Maki, K. C., Reeves, M. S., Farmer, M., Griinari, M., Berge, K., Vik, H., Hubacher, R., and Rains, T. M. Krill oil supplementation increases plasma concentrations of eicosapentaenoic and docosahexaenoic acids in overweight and obese men and women. Nutr.R PubMed
  9. Albert BB, Derraik JG, Brennan CM, et al. Supplementation with a blend of krill and salmon oil is associated with increased metabolic risk in overweight men. Am J Clin Nutr 2015;102(1):49-57.
  10. Berge K, Musa-Veloso K, Harwood M, Hoem N, Burri L. Krill oil supplementation lowers serum triglycerides without increasing low-density lipoprotein cholesterol in adults with borderline high or high triglyceride levels. Nutr Res 2014;34(2):126-33. PubMed
  11. Lobraico JM, DiLello LC, Butler AD, Cordisco ME, Petrini JR, Ahmadi R. Effects of krill oil on endothelial function and other cardiovascular risk factors in participants with type 2 diabetes, a randomized controlled trial. BMJ Open Diabetes Res Care. 2015 PubMed
  12. van der Wurff ISM, von Schacky C, Bergeland T, Zeegers MP, Kirschner PA, de Groot RHM. Krill oil supplementation's effect on school grades in typically developing adolescents. Prostaglandins Leukot Essent Fatty Acids 2023;191:102553. PubMed
  13. van der Wurff ISM, von Schacky C, Bergeland T, et al. Effect of 1 year krill oil supplementation on cognitive achievement of Dutch adolescents: A double-blind randomized controlled trial. Nutrients. 2019;11(6):1230. PubMed

See these in context on the Krill Oil 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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