Can I take Black garlic and Vitamin C together?
Drug interaction guide
Originally published 25 Jan 2026
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There are no known harmful interactions between black garlic and vitamin C. In fact, they are often taken together because they both have antioxidant properties.
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Why this happens
Black garlic and vitamin C work through different pathways in the body and do not interfere with how the other is absorbed, broken down, or used. Black garlic is aged white garlic that contains high levels of S-allyl cysteine, while vitamin C (ascorbic acid) is a water-soluble vitamin. They do not compete for the same enzymes or transport systems.
What you should do
It is generally safe to take these two supplements together. However, always stick to the recommended dosages on the packaging. If you are scheduled for surgery, you should inform your doctor about the black garlic, as garlic supplements can sometimes thin the blood.
Important precautions
Surgery or dental procedures
Black garlic can significantly thin the blood and increase the risk of bleeding. You must stop taking it at least two weeks before any scheduled surgery or dental work.
Bleeding disorders or use of blood-thinning medication (e.g. warfarin)
Black garlic may increase the effect of blood-thinning medicines, making you more likely to bleed or bruise easily.
Kidney stones (oxalate)
High doses of Vitamin C can increase the amount of oxalate in your urine, significantly raising the risk of developing kidney stones, especially if you have had them before.
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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