Grape Seed Extract 100 mg Ingredients & Drug Interactions
by Solgar
What is this page for?
First and foremost: checking Grape Seed Extract 100 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
Grape Seed Extract 100 mg is a dietary supplement by Solgar with 1 active ingredient. Its ingredients are commonly taken for antioxidant support, heart and circulation health, vein problems (such as varicose veins).Based on those ingredients, 910 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Grape seed extract. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against Grape Seed Extract 100 mg by Solgar
Ask about any prescription or over-the-counter medication and we check it for interactions with Grape Seed Extract 100 mg by Solgar — 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
Ask the Pharmacist
A licensed pharmacist will answer your question by email — free, usually within 24 hours.
Got it — thank you!
A licensed pharmacist will answer within 24 hours. Keep an eye on your email (worth checking spam, just in case).
HelloPharmacist Scorecard of Grape Seed Extract 100 mg by Solgar
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: grape seed extract at 100 mg per capsule. Grape seed extract is a concentrated form of compounds from grape seeds, used traditionally to support circulation.
The capsule also contains inactive ingredients — microcrystalline cellulose, vegetable cellulose, vegetable magnesium stearate, and silica — which are fillers and binders that help form and deliver the capsule.
Does it work?
Moderate evidence
The evidence for grape seed extract is most established for chronic venous insufficiency (CVI), a condition in which blood doesn't return well from the legs — the data rates it as possibly effective for this use. For chemotherapy-induced nausea and vomiting, allergic rhinitis (hay fever), and obesity, the available evidence suggests it is possibly ineffective.
The data we hold does not establish effectiveness for other popular uses.
How safe is it?
Well-documented data
Grape seed extract appears generally well tolerated in studies. The most commonly reported side effects are mild — abdominal pain, diarrhea, dry mouth, indigestion, headache, joint pain, and nausea — and a small number of trial participants reported sore throat or cough at rates similar to placebo.
Anaphylaxis (a severe allergic reaction) to grape skin has been reported rarely. As a concentrated supplement during pregnancy, the safety data is limited, so it's best avoided; whole grapes as food are fine.
For breastfeeding, there isn't enough information on concentrated grape supplements, so talk with your doctor or pharmacist about whether it's right for you.
Meds to double-check
Moderate interaction found
Before taking this product, check with your doctor or pharmacist if you take blood thinners (anticoagulants) or antiplatelet drugs like aspirin, cyclosporine (an immunosuppressant), sedatives like midazolam, or any medications metabolized by liver enzymes CYP1A2, CYP2D6, CYP3A4, or CYP2E1 — all carry a Moderate interaction risk. If you take cyclosporine, time doses at least 2 hours apart from this supplement.
The bottom line
Scorecard at a glanceFully disclosed formula with some supporting evidence behind its ingredients' uses. Moderate medication interactions have been identified, and safety information is well characterized.
Grape seed extract may be worth considering if you have chronic venous insufficiency and want to explore natural options. However, it interacts with a substantial number of medications — especially blood thinners, immunosuppressants like cyclosporine, and several classes of drugs your liver metabolizes — so you'll want to check your exact medications before starting.
Talk with your own doctor or pharmacist to see if this supplement fits your situation safely.
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 Apr 23, 2020.
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 Grape Seed Extract 100 mg, straight from the product label.
| Brand | Solgar |
|---|---|
| Barcode (UPC) | 033984013568 |
| Net contents | 60 Vegetable Capsule(s) |
| Market status | On market |
| Date entered into DSLD | Apr 23, 2020 |
| DSLD ID | 218280 |
| Product type | Botanical |
| Supplement form | Capsule |
| Dietary claims / uses | All Other, Structure/Function |
| Intended target group(s) | Vegan, Vegetarian, 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 Grape Seed Extract 100 mg by Solgar, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Grape seed extract | 100 mg | -- |
Other ingredients: Microcrystalline Cellulose, Vegetable Cellulose, Vegetable Magnesium Stearate, Silica
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.
Formula
Grape Seed Extract naturally contains polyphenols known as oligomeric proanthocyanidins (OPCs). These active ingredients also exist in many plants and herbs such as green tea, bilberry and cranberry, and are important to healthful traditions around the world. In addition to being cardio supportive, proanthocyanidin compounds possess antioxidant properties that help fight cell-damaging free radicals which can cause oxidative stress in the body, and in turn contribute to premature aging of cells.
Brand IP Statement(s)
2017 Solgar, Inc.
General Statements
Solgar since 1947
Formulation
Phytonutrient Antioxidant support
Non-GMO Gluten, wheat & dairy free
Suitable for vegans
Free of: Gluten, wheat, dairy, soy, yeast, sugar, sodium, artificial flavor, sweetener, preservatives and color.
Seals/Symbols
GF Certified Gluten-free
FDA Statement of Identity
Dietary Supplement
Suggested/Recommended/Usage/Directions
Suggested Use: As a dietary supplement for adults, take one (1) vegetable capsule two times daily, preferably with meals or as directed by a healthcare practitioner.
Precautions
If you are pregnant, nursing, taking any medications or have any medical condition, please consult your healthcare practitioner before taking any dietary supplement.
Discontinue use and consult your healthcare practitioner if any adverse reactions occur.
Keep out of reach of children.
Do not use if outer body seal is missing or damaged.
Storage
Store at room temperature.
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.
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
Grape Seed Extract 100 mg by Solgar 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 Grape Seed Extract 100 mg by Solgar
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 Amounts shown are per serving.
Grape seed extract
Interacts with910 drugs
Grapes and grape products like grape seed extract contain antioxidant compounds such as resveratrol and proanthocyanidins that may support heart and b...
Grape seed extract monograph & interactionsOther (inactive) ingredients: Microcrystalline Cellulose, Vegetable Cellulose, Vegetable Magnesium Stearate, Silica. These complete the product’s ingredient list but are not active constituents.
Grape Seed Extract 100 mg by Solgar Drug Interactions
HelloPharmacist Interaction Report
Solgar's Grape Seed Extract 100 mg does interact with medications through its single active ingredient, grape seed extract.
The most serious documented interaction is with cyclosporine (an immunosuppressant drug), where grape juice has been shown in a small study to reduce cyclosporine absorption by up to 30%. The extract may also affect how your body processes several classes of drugs metabolized by liver enzymes, including CYP1A2, CYP2D6, CYP3A4, and CYP2E1 substrates — the mechanisms are complex and in some cases contradictory (the research suggests the extract might either speed up or slow down drug clearance depending on the enzyme), but all carry a Moderate severity rating.
Read the full breakdown — every affected drug type, severity by severity
Grape seed extract may theoretically increase bleeding risk if you take blood thinners (anticoagulants) or antiplatelet drugs like aspirin, because the extract itself may have mild blood-thinning properties. Additionally, long-term use of this supplement might reduce the effectiveness of midazolam, a sedative medication.
Alternately, phenacetin — a pain reliever rarely used in the US today — is documented to have reduced blood levels when taken with grape juice. Altogether, these interactions span 911 individual medications.
To see whether any of your current prescriptions fall into these categories, use the medication interaction checker on this page. If you take cyclosporine or blood thinners, or if you're on any sedative, check with your own doctor or pharmacist before starting this product.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against Grape Seed Extract 100 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 checkerIngredients driving the most interactions
Individual Drug Interactions
The ingredients in Grape Seed Extract 100 mg interact with 910 drugs. Click any drug to see the details.
1 of the 1 ingredient in Grape Seed Extract 100 mg interact with drugs. Each result below shows which ingredient is responsible. Grape seed extract
AzilsartanEdarbi
How Azilsartan interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Azilsartan interactionAzilsartan, ChlorthalidoneEdarbyclor
How Azilsartan, Chlorthalidone interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Azilsartan, Chlorthalidone interactionBupivacaine, MeloxicamZynrelef Kit
How Bupivacaine, Meloxicam interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Bupivacaine, Meloxicam interactionCelecoxibCelebrex, Elyxyb
How Celecoxib interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Celecoxib interactionFlurbiprofenAnsaid, Flurbiprofen, Flurprofen, Froben, Froben SR, Ocufen
How Flurbiprofen interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Flurbiprofen interactionFluvastatinLescol, Lescol XL
How Fluvastatin interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Fluvastatin interactionFosphenytoinCerebyx
How Fosphenytoin interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Fosphenytoin interactionFosphenytoin SodiumSesquient
How Fosphenytoin Sodium interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Fosphenytoin Sodium interactionGliclazideDiamicron
How Gliclazide interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Gliclazide interactionGlimepirideAmaryl
How Glimepiride interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Glimepiride interactionGlipizideGlucotrol, Glucotrol XL
How Glipizide interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Glipizide interactionGlipizide, MetforminMetaglip
How Glipizide, Metformin interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Glipizide, Metformin interactionGlyburideAlbert Glyburide, Diabeta, Glycron, Glynase, Glynase PresTab, Micronase +1 more
How Glyburide interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Glyburide interactionGlyburide, MetforminGlucovance
How Glyburide, Metformin interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Glyburide, Metformin interactionHydrochlorothiazide, IrbesartanAvalide
How Hydrochlorothiazide, Irbesartan interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Hydrochlorothiazide, Irbesartan interactionHydrochlorothiazide, ValsartanDiovan HCT
How Hydrochlorothiazide, Valsartan interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Hydrochlorothiazide, Valsartan interactionIndomethacinIndo-Lemmon, Indocin, Indocin SR, Indomethagan, Tivorbex
How Indomethacin interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Indomethacin interactionIrbesartanAprovel, Avapro
How Irbesartan interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Irbesartan interactionIrbesartan, HydrochlorothiazideCoAprovel
How Irbesartan, Hydrochlorothiazide interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Irbesartan, Hydrochlorothiazide interactionLesinuradZurampic
How Lesinurad interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Lesinurad interactionLesinurad, AllopurinolDuzallo
How Lesinurad, Allopurinol interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Lesinurad, Allopurinol interactionLumiracoxibPrexige
How Lumiracoxib interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Lumiracoxib interactionMefenamic AcidPonstel
How Mefenamic Acid interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Mefenamic Acid interactionMeloxicamAnjeso, Mobic, Qmiiz ODT, Vivlodex
How Meloxicam interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Meloxicam interactionMephenytoinMesantoin
How Mephenytoin interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Mephenytoin interactionMetformin, RosiglitazoneAvandamet
How Metformin, Rosiglitazone interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Metformin, Rosiglitazone interactionMontelukast SodiumSingulair
How Montelukast Sodium interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Montelukast Sodium interactionNateglinideStarlix
How Nateglinide interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Nateglinide interactionPhenobarbital, PhenytoinDilantin with PB
How Phenobarbital, Phenytoin interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Phenobarbital, Phenytoin interactionPhenytoinDi-Phen, Dilantin, Dilantin Infatabs, Dilantin injection, Dilantin Kapseals, Phenytek
How Phenytoin interacts with Grape Seed Extract 100 mg — through 1 ingredient. Tap an ingredient for the detail:
Grape Seed ExtractCytochrome P450 2c9 (cyp2c9) Substrates Minor
Interaction Summary
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
Read the full Grape Seed Extract + Phenytoin interactionEach ingredient & the kinds of drugs it affects
For each ingredient in Grape Seed Extract 100 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.
Grape seed extract
Anticoagulant/Antiplatelet Drugs
Theoretically, grape extracts may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
In vitro evidence suggests that grape extracts might decrease platelet aggregation.
Cyclosporine (Neoral, Sandimmune)
Ingesting grape juice with cyclosporine can reduce cyclosporine absorption.
A small pharmacokinetic study in healthy young adults shows that intake of purple grape juice 200 mL along with cyclosporine can decrease the absorption of cyclosporine by up to 30% when compared with water. Separate doses of grape juice and cyclosporine by at least 2 hours to avoid this interaction.
Cytochrome P450 1A2 (Cyp1A2) Substrates
Theoretically, grape juice might reduce the levels of CYP1A2 substrates.
A small pharmacokinetic study in healthy adults shows that ingestion of 200 mL of grape juice decreases phenacetin plasma levels. This is thought to be due to induction of CYP1A2.
Cytochrome P450 2D6 (Cyp2D6) Substrates
Theoretically, grape seed extract may increase the levels of CYP2D6 substrates.
In vitro evidence suggests that grape seed extract might inhibit CYP2D6 enzymes. However, this interaction has not been reported in humans.
Cytochrome P450 2E1 (Cyp2E1) Substrates
Theoretically, grape seed extract might increase the levels of CYP2E1 substrates.
In vitro and animal research suggests that grape seed proanthocyanidin extract inhibits CYP2E1 enzymes. However, this interaction has not been reported in humans.
Cytochrome P450 3A4 (Cyp3A4) Substrates
It is unclear if grape seed extract inhibits or induces CYP3A4; research is conflicting.
In vitro evidence suggests that grape seed extract might inhibit CYP3A4 enzymes. However, evidence from animal research shows that grape seed extract may induce CYP3A4 in the liver. So far, these interactions have not been reported in humans.
Midazolam (Versed)
Theoretically, long-term intake of grape seed extract might decrease the effects of midazolam.
Animal research shows that subchronic ingestions of grape seed extract can increase the elimination of intravenous midazolam by increasing hepatic CYP3A4 activity. Single doses of grape seed extract do not appear to affect midazolam elimination.
Phenacetin
Grape juice might decrease phenacetin absorption.
A small pharmacokinetic study in healthy adults shows that ingestion of 200 mL of grape juice decreases phenacetin plasma levels. This is thought to be due to induction of cytochrome P450 1A2 (CYP1A2).
Cytochrome P450 2C9 (Cyp2C9) Substrates
It is unclear if grape juice or grape seed extract inhibits CYP2C9; research is conflicting.
In vitro evidence shows that grape seed extract or grape juice might inhibit CYP2C9 enzymes. However, a small pharmacokinetic study in healthy adults shows that drinking 8 ounces of grape juice once does not affect the clearance of flurbiprofen, a probe-drug for CYP2C9 metabolism. The effects of continued grape juice consumption are unclear.
Brand information
Manufacturer and brand details for Grape Seed Extract 100 mg, from the product label.
Solgar
See all Solgar products- Name
- Solgar, Inc.
- Street Address
- 500 Willow Tree Road
- City
- Leonia
- State
- NJ
- ZipCode
- 07605
- Phone Number
- 1-877-765-4274
- Web Address
- www.solgar.com
Grape Seed Extract 100 mg by Solgar: Common Questions
Does Grape Seed Extract 100 mg by Solgar interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
What is grape seed extract, and what is it used for?
Are there common side effects?
Is it safe to take during pregnancy or breastfeeding?
Can I take this with my blood thinner?
Does grape seed extract interact with many medications?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if Grape Seed Extract 100 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 Grape Seed Extract 100 mg’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Sources & How We Checked
Grape Seed Extract 100 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 34 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.
Grape 34 references
- Kiesewetter H, Koscielny J, Kalus U, et al. Efficacy of orally administered extract of red vine leaf AS 195 (folia vitis viniferae) in chronic venous insufficiency (stages I-II). A randomized, double-blind, placebo-controlled trial. Arzneimittelforschung
- Xiao Dong S, Zhi Ping Z, Zhong Xiao W, et al. Possible enhancement of the first-pass metabolism of phenacetin by ingestion of grape juice in Chinese subjects. Br J Clin Pharmacol 1999;48:638-40. PubMed
- Vaswani SK, Hamilton RG, Carey RN, et al. Anaphylaxis recurrent urticaria and angioedema from grape hypersensitivity. J Allergy Clin Immunol 1998;101:S31.
- Chevallier A. The Encyclopedia of Medicinal Plants. London, UK: Dorling Kindersley, Ltd., 1996.
- Bernstein DI, Bernstein CK, Deng C, et al. Evaluation of the clinical efficacy and safety of grapeseed extract in the treatment of fall seasonal allergic rhinitis: a pilot study. Ann Allergy Asthma Immunol 2002;88:272-8.. PubMed
- Greenblatt DJ, von Moltke LL, Perloff ES, et al. Interaction of flurbiprofen with cranberry juice, grape juice, tea, and fluconazole: in vitro and clinical studies. Clin Pharmacol Ther 2006;79:125-33. PubMed
- Ward NC, Hodgson JM, Croft KD, et al. The combination of vitamin C and grape-seed polyphenols increases blood pressure: a randomized, double-blind, placebo-controlled trial. J Hypertens 2005;23:427-34.. PubMed
- Ray, S. D., Parikh, H., Hickey, E., Bagchi, M., and Bagchi, D. Differential effects of IH636 grape seed proanthocyanidin extract and a DNA repair modulator 4-aminobenzamide on liver microsomal cytochrome 4502E1-dependent aniline hydroxylation. Mol Cell B PubMed
- O'Byrne, D. J., Devaraj, S., Grundy, S. M., and Jialal, I. Comparison of the antioxidant effects of Concord grape juice flavonoids alpha-tocopherol on markers of oxidative stress in healthy adults. Am J Clin.Nutr. 2002;76(6):1367-1374.
- Schaefer, E., Peil, H., Ambrosetti, L., and Petrini, O. Oedema protective properties of the red vine leaf extract AS 195 (Folia vitis viniferae) in the treatment of chronic venous insufficiency. A 6-week observational clinical trial. Arzneimittelforschun PubMed
- Nishikawa, M., Ariyoshi, N., Kotani, A., Ishii, I., Nakamura, H., Nakasa, H., Ida, M., Nakamura, H., Kimura, N., Kimura, M., Hasegawa, A., Kusu, F., Ohmori, S., Nakazawa, K., and Kitada, M. Effects of continuous ingestion of green tea or grape seed extra
- de Lange, D. W., Scholman, W. L., Kraaijenhagen, R. J., Akkerman, J. W., and van de Wiel, A. Alcohol and polyphenolic grape extract inhibit platelet adhesion in flowing blood. Eur.J Clin.Invest 2004;34(12):818-824. PubMed
- Samet, J. M. and Coultas, D. B. Reduced forced vital capacity in California grape workers. What does it mean? Am Rev.Respir.Dis 1992;145(2 Pt 1):255-256. PubMed
- Gamsky, T. E., McCurdy, S. A., Samuels, S. J., and Schenker, M. B. Reduced FVC among California grape workers. Am Rev.Respir.Dis 1992;145(2 Pt 1):257-262. PubMed
- de Lange, D. W., Verhoef, S., Gorter, G., Kraaijenhagen, R. J., van de Wiel, A., and Akkerman, J. W. Polyphenolic grape extract inhibits platelet activation through PECAM-1: an explanation for the French paradox. Alcohol Clin.Exp.Res 2007;31(8):1308-1314 PubMed
- Etheridge, A. S., Black, S. R., Patel, P. R., So, J., and Mathews, J. M. An in vitro evaluation of cytochrome P450 inhibition and P-glycoprotein interaction with goldenseal, Ginkgo biloba, grape seed, milk thistle, and ginseng extracts and their constitu
- Krikorian, R., Nash, T. A., Shidler, M. D., Shukitt-Hale, B., and Joseph, J. A. Concord grape juice supplementation improves memory function in older adults with mild cognitive impairment. Br J Nutr. 2010;103(5):730-734. PubMed
- Ingersoll, G. L., Wasilewski, A., Haller, M., Pandya, K., Bennett, J., He, H., Hoffmire, C., and Berry, C. Effect of concord grape juice on chemotherapy-induced nausea and vomiting: results of a pilot study. Oncol.Nurs.Forum 2010;37(2):213-221. PubMed
- Oliveira-Freitas, V. L., Dalla, Costa T., Manfro, R. C., Cruz, L. B., and Schwartsmann, G. Influence of purple grape juice in cyclosporine bioavailability. J Ren Nutr. 2010;20(5):309-313. PubMed
- Hollis, J. H., Houchins, J. A., Blumberg, J. B., and Mattes, R. D. Effects of concord grape juice on appetite, diet, body weight, lipid profile, and antioxidant status of adults. J Am Coll.Nutr. 2009;28(5):574-582. PubMed
- Dohadwala, M. M., Hamburg, N. M., Holbrook, M., Kim, B. H., Duess, M. A., Levit, A., Titas, M., Chung, W. B., Vincent, F. B., Caiano, T. L., Frame, A. A., Keaney, J. F., Jr., and Vita, J. A. Effects of Concord grape juice on ambulatory blood pressure in
- Rabe, E., Stucker, M., Esperester, A., Schafer, E., and Ottillinger, B. Efficacy and tolerability of a red-vine-leaf extract in patients suffering from chronic venous insufficiency--results of a double-blind placebo-controlled study. Eur.J Vasc.Endovasc. PubMed
- Trotta, M., Cesaretti, M., Conzi, R., Derchi, L. E., and Borgonovo, G. Elderly male with mesogastric pain. Small bowel obstruction caused by an intact fresh grape. Ann.Emerg.Med 2011;58(4):e1-e2. PubMed
- McCurdy, S. A., Wiggins, P., Schenker, M. B., Munn, S., Shaieb, A. M., Weinbaum, Z., Goldsmith, D., McGillis, S. T., Berman, B., and Samuels, S. Assessing dermatitis in epidemiologic studies: occupational skin disease among California grape and tomato ha
- Winter, C. K. and Kurtz, P. H. Factors influencing grape worker susceptibility to skin rashes. Bull.Environ.Contam Toxicol. 1985;35(3):418-426. PubMed
- Yamasaki, R., Dekio, S., and Jidoi, J. Contact dermatitis from grape bud. Contact Dermatitis 1985;12(4):226-227. PubMed
- Cox, J. and Grigg, M. Small bowel obstruction by an intact grape. J Am Geriatr.Soc 1986;34(7):550. PubMed
- Faircloth, D. E. and Robison, W. J. Obstruction of the sigmoid colon by grape seeds. JAMA 11-27-1981;246(21):2430. PubMed
- Marguerie, C. and Drouet, M. [Occupational eosinophilic lung in a grape grower: role of sulfites]. Allerg.Immunol.(Paris) 1995;27(5):163-167.
- Brito, FF., Martinez, A., Palacios, R., Mur, P., Gomez, E., Galindo, P. A., Borja, J., and Martinez, J. Rhinoconjunctivitis and asthma caused by vine pollen: a case report. J Allergy Clin Immunol 1999;103(2 Pt 1):262-266. PubMed
- Ras RT, Zock PL, Zebregs YE, et al. Effect of polyphenol-rich grape seed extract on ambulatory blood pressure in subjects with pre- and stage I hypertension. Br J Nutr 2013;110(12):2234-41. PubMed
- Berry AC, Nakshabendi R, Abidali H, et al. Adverse effects of grape seed extract supplement: A clinical case and long-term follow-up. J Diet Suppl. 2016;13(2):232-5. PubMed
- Martínez-Maqueda D, Zapatera B, Gallego-Narbón A, Vaquero MP, Saura-Calixto F, Pérez-Jiménez J. A 6-week supplementation with grape pomace to subjects at cardiometabolic risk ameliorates insulin sensitivity, without affecting other metabolic syndrome mark
- Moon SW, Shin YU, Cho H, Bae SH, Kim HK; and for the Mogen Study Group. Effect of grape seed proanthocyanidin extract on hard exudates in patients with non-proliferative diabetic retinopathy. Medicine (Baltimore) 2019;98(21):e15515. PubMed
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