Can I take Black garlic and Evening primrose oil together?
Drug interaction guide
Originally published 25 Jan 2026
Meets Patient’s editorial guidelines
- DownloadDownload
- Share
- Language
- Discussion
Taking black garlic and evening primrose oil together may increase your risk of bruising or bleeding. This is because both supplements can thin the blood and slow down the time it takes for a clot to form.
In this article:
Continue reading below
Why this happens
Black garlic contains compounds that prevent blood cells (platelets) from sticking together. Evening primrose oil contains gamma-linolenic acid (GLA), which also has mild blood-thinning effects. When used together, these effects can add up, making it harder for your blood to clot.
What you should do
Back to contentsUse this combination with caution. Watch for signs of unusual bleeding, such as nosebleeds, bleeding gums when brushing your teeth, or dark, tea-coloured urine. If you have an upcoming surgery or dental procedure, stop taking both supplements at least two weeks beforehand. If you are already taking prescribed blood thinners (like warfarin or aspirin), do not take these supplements without speaking to your doctor first.
Continue reading below
Using other medicines
Back to contentsTaking multiple medicines? Our Medicines Interaction Checker helps you check whether your prescriptions, over-the-counter medicines, and supplements are safe to take together. Simply search for your medicines to see potential interactions and what to do about them.
Disclaimer
This information is for general educational purposes only and should not be relied upon as a substitute for professional medical advice. Always consult your GP, pharmacist, or another qualified healthcare professional before making decisions about your medications. Individual circumstances may vary, and only a healthcare professional who knows your medical history can provide personalised guidance.
Patient picks for Drug interactions

Treatment and medication
Can I take Co-codamol and Ibuprofen together?
It is safe to take co-codamol and ibuprofen together. They are different types of painkillers that work in different ways to provide better pain relief than taking either one alone.

Treatment and medication
Can I take Ibuprofen and Naproxen together?
Taking ibuprofen and naproxen together significantly increases your risk of serious side effects, particularly stomach ulcers, internal bleeding, and kidney problems. It can also make your blood pressure rise and cause fluid retention.
Continue reading below
Article history
The information on this page is written and peer reviewed by qualified clinicians.
25 Jan 2026 | Originally published

Ask, share, connect.
Browse discussions, ask questions, and share experiences across hundreds of health topics.

Feeling unwell?
Assess your symptoms online for free
Sign up to the Patient newsletter
Your weekly dose of clear, trustworthy health advice - written to help you feel informed, confident and in control.
By subscribing you accept our Privacy Policy. You can unsubscribe at any time. We never sell your data.