Can I take Black garlic and Devil's claw together?
Drug interaction guide
Originally published 25 Jan 2026
Meets Patient’s editorial guidelines
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Taking black garlic and devil's claw together may increase your risk of bruising or bleeding. This is because both supplements have properties that can thin the blood or prevent it from clotting properly.
Why this happens
Both black garlic and devil's claw have 'antiplatelet' effects. This means they make the tiny cells in your blood (platelets) less sticky, which makes it harder for your blood to form clots. When used together, these effects can add up.
What you should do
Use this combination with caution. If you notice unusual bruising, nosebleeds, or bleeding gums, stop taking them and speak to your doctor. You should stop taking both supplements at least two weeks before any planned surgery or dental work. If you are already taking prescribed blood-thinning medications (like warfarin or aspirin), do not take these supplements without medical advice.
Important precautions
Surgery or bleeding disorders
Both medicines can thin the blood and increase the risk of bleeding. You must stop taking them at least 2 weeks before any planned surgery or dental procedure.
Stomach ulcers or gallstones
Devil's claw increases stomach acid and bile production. Do not use it if you have stomach ulcers, duodenal ulcers, or gallstones, as it can severely worsen these conditions.
Diabetes medication
Devil's claw can lower blood sugar levels. If you take insulin or other diabetes medicines, you must monitor your blood sugar closely as your dose may need adjustment to prevent hypoglycaemia.
Food and drink warnings
Alcohol
Black garlic may have a mild blood-thinning effect. While there is no direct contraindication, excessive alcohol consumption can also thin the blood and increase the risk of bleeding or bruising. Use alcohol in moderation.
Using other medicines
Taking 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.
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Article history
The information on this page is written and peer reviewed by qualified clinicians.
Article also available in English, German, Spanish, French, Italian, Portuguese, Hindi, Hebrew, Arabic, and Swedish.
25 Jan 2026 | Originally published
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