Two Genuine Medication Interactions Worth Knowing First
This formula combines 500mg quercetin with bromelain, vitamin C (80mg), citrus bioflavonoids, rosehip, acerola cherry, and rutin. As covered in more detail in our quercetin guide, quercetin’s dose here falls within the range studied for safety in clinical trials, but it’s important to know quercetin genuinely inhibits several liver enzymes (CYP3A4, CYP2D6, CYP2C19, CYP1A2) involved in metabolising a wide range of common medications — including certain antidepressants, some heart and blood pressure medications, tamoxifen, and quinolone antibiotics. There’s a documented clinical case of a patient on stable warfarin therapy experiencing a significantly elevated INR after starting quercetin. If you take any regular prescription medication, it’s genuinely worth checking with your GP or pharmacist before starting, rather than assuming compatibility because these are “natural” antioxidants.
Bromelain, included here for absorption, has its own genuine blood-thinning properties and can enhance the effect of anticoagulant or antiplatelet medication, including warfarin, aspirin, and clopidogrel — worth discussing with your GP if you take these, and stopping use at least two weeks before any planned surgery. Bromelain also carries a risk of allergic cross-reactivity in people with pineapple or latex allergies.
Vitamin C has an established, EU-authorised role in normal immune function, reduced tiredness and fatigue, and increased iron absorption — genuine, though “enhanced immune function” and “improved respiratory comfort” claims for the combined formula go further than what’s specifically established; general antioxidant support is a more accurate description than a guarantee of fewer infections or respiratory symptoms.
Vegan, free from artificial colours, flavours, gluten, lactose, and nuts, manufactured in the UK to GMP and BRC standards. Take 2 capsules daily with a full glass of water. Speak to your GP or pharmacist before starting if you take any regular prescription medication (particularly blood thinners, antidepressants, or heart medication), have a pineapple or latex allergy, have kidney problems, or are pregnant or breastfeeding.
The Research Behind This Product
Energy & Vitality
Quercetin Supplements: What UK Research Actually Shows
Quercetin is one of the most widely sold antioxidant supplements in the UK, but it's also one of the few with genuine, well-documented interactions with common prescription medication. Here's what UK-relevant research actually supports, and the safety point most product listings leave out entirely.
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