Herb & supplement monograph

Safflower Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated July 2026

What is this page for?

First and foremost: how Safflower interacts with medications. The heart of this page is the interaction list — every drug Safflower is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Safflower is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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On this page

Safflower Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, the overall risk of a clinically significant Safflower drug interaction appears low for most people, especially at typical supplement doses. None of the listed interactions are rated major, and all are graded as only possible, meaning the evidence comes from small studies, case reports, or conflicting findings.

Interactions deserving the most attention

The strongest concern involves warfarin, where one person stabilized on the drug developed urinary bleeding and an elevated INR after taking a high daily dose of safflower extract for two weeks. A similar caution applies to other anticoagulant and antiplatelet drugs, since very high doses of safflower oil reduced platelet clumping in small studies, though lower doses did not. People taking diabetes medications should also be aware that studies conflict, with safflower oil raising blood sugar in one trial and lowering it in another.

What the rest of the list means

Although the number of listed medications is large, nearly all of them fall into these few broad categories of blood thinners and diabetes drugs. The concerns are mostly dose-dependent or based on limited and conflicting research, and studies using more modest amounts of safflower oil have often shown no meaningful effect in people.

Check your medications against Safflower

Based on HelloPharmacist’s Safflower interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Safflower

208 medications have a known interaction with Safflower, graded by severity. Select any drug for the full evidence-based detail.

Don’t want to scroll the list? Just ask.

Tell us the medications you take and we’ll check each one against Safflower using our pharmacist-reviewed interaction data.

AI summaries are generated from our Safflower interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Safflower combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Safflower affects

Every type of medication (drug category) Safflower is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 3 drug categories Safflower interacts with

Anticoagulant/antiplatelet DrugsAntidiabetes DrugsWarfarin

Anticoagulant/Antiplatelet Drugs

High doses of safflower oil might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Small clinical studies show that taking safflower oil, approximately 55 grams daily for 2-3 weeks, decreases platelet aggregation. However, taking lower doses of safflower oil, such as 5 grams daily for 4 weeks, does not seem to affect platelet function. In one case report, a 74-year-old male stabilized on warfarin developed urinary tract bleeding and an elevated INR after taking a safflower extract 20 grams daily for 14 days.

Likelihood Possible Evidence B

Antidiabetes Drugs

Theoretically, safflower oil might alter the effects of antidiabetes drugs.
Some clinical research shows that taking safflower oil 10 grams daily for 3 weeks can increase fasting blood glucose in patients with type 2 diabetes. However, clinical research in patients with metabolic syndrome with or without impaired glucose tolerance shows that taking safflower oil 8 grams daily for 12 weeks reduces fasting glucose levels by around 8 mg/dL. Some clinical research also shows that taking safflower oil 8 grams daily for 16 weeks does not affect fasting glucose levels in patients with type 2 diabetes.

Likelihood Possible Evidence B

Warfarin

Theoretically, safflower oil might increase the risk of bleeding when taken with warfarin.
In one case report, a 74-year-old male stabilized on warfarin developed urinary tract bleeding and an elevated INR after taking a safflower extract 20 grams daily for 14 days.

Likelihood Possible Evidence D

Monograph

Safflower: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed July 2026 ·

The bottom line

Safflower is a thistle-like plant used mainly for its seed oil (a common cooking oil) and its colorful flowers. Safflower oil is a reasonable source of unsaturated fats, but strong proof that supplements treat specific diseases is limited. The flower extracts have much weaker evidence and should be used with caution, especially during pregnancy.

Scientific name: Carthamus tinctorius
Family: Asteraceae
Part used: Flowers (petals), seeds, and seed oil
Common forms: Cooking oil, capsules (oil or CLA), tea, dried flowers, topical oil

People commonly use it for

Heart and cholesterol support
Skin moisturizing
Menstrual cramps
Mild constipation
Weight management (oil)

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallUse caution

Safflower oil in food is generally well tolerated, but concentrated flower extracts and high-dose supplements have less safety data.

PregnancyLikely Safe

When safflower oil is used orally as part of the diet.

Read the full pregnancy detail

BreastfeedingLikely Safe

When safflower oil is used orally as part of the diet. There is insufficient reliable information available about the safety of safflower flower durin...

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

Safflower (Carthamus tinctorius) is a thistle-like plant with bright yellow, orange, or red flowers. It has been grown for thousands of years, first as a source of dye and later for its oil-rich seeds. Today it is cultivated in many parts of the world, including India, the United States, and parts of the Middle East and Asia.

The two most common products from safflower are the seed oil and the dried flowers. Safflower oil is a popular cooking oil because it has a mild flavor and a high smoke point. The flowers have a long history in traditional medicine, and they are sometimes used as a cheaper substitute for true saffron in cooking and coloring.

People take safflower as a cooking oil, in capsules, as a tea made from the flowers, or apply the oil to the skin.

How it works

Safflower oil is rich in unsaturated fatty acids, especially linoleic acid, and also contains vitamin E, which acts as an antioxidant. Diets that swap saturated fats for these unsaturated fats may help support healthier cholesterol levels. Some safflower oil supplements are marketed as containing CLA (conjugated linoleic acid), which has been studied for body fat with inconsistent results.

Safflower flowers contain plant pigments and compounds such as carthamin and other flavonoids. Laboratory and animal studies suggest these may have antioxidant, anti-inflammatory, and blood-thinning-like effects, and the flower has traditionally been thought to affect blood flow and the uterus. Importantly, these mechanisms are mostly based on test-tube and animal research and do not prove that safflower works the same way in people.

Effectiveness

Does Safflower work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 16 uses evaluated

16 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

For Safflower, current evidence isn’t strong enough to rate any specific use. The conditions it has been studied for are listed below.

Also studied for 16 conditions — evidence insufficient to rate

Insufficient Reliable Evidence To Rate Coronary heart disease (CHD)