1. Grapefruit and CYP3A4
Grapefruit (and Seville orange, pomelo) inhibits the CYP3A4 enzyme that clears many statins, calcium-channel blockers and some immunosuppressants. Blood levels can climb significantly. We never include grapefruit in a program for anyone on these — we use lemon or lime instead.
2. Leafy greens and warfarin
Kale, spinach and parsley are rich in vitamin K, which counteracts warfarin. The rule isn't avoidance, it's consistency: the same amount of greens every day so your INR stays stable. Sudden green-juice enthusiasm is what causes problems.
3. Beets, celery and blood-pressure drugs
Both lower pressure on their own. Stacked with medication, some people feel light-headed. Start low, monitor readings and tell your prescriber.
4. Potassium and ACE inhibitors or spironolactone
Juice concentrates potassium — a large carrot-orange-spinach juice can exceed 1,000 mg. With potassium-sparing drugs or reduced kidney function this matters. We keep our Kidney Cleanse program deliberately moderate in potassium.
5. Ginger, turmeric and blood thinners
Both have mild antiplatelet activity. In culinary amounts it's fine; at the concentrated doses in some 'shots' it can add up with aspirin, clopidogrel or warfarin.
Always list your medications when you ask the Expert Desk. Most interactions are managed with a substitution or a consistent dose, not by giving up juice.
Reviewed by the Nourishjuice nutrition panel. Wellness guidance only — not a substitute for medical advice. Discuss changes with your clinician, especially if you take medication.