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Quercetin is a plant-derived flavonoid found naturally in foods such as red onions, apples, capers, berries, and green tea. It is one of the most extensively studied plant compounds in nutritional science, with documented activity across immune modulation, histamine regulation, antioxidant defence, and cellular protection. In supplement form it is used for seasonal allergy support, everyday immune resilience, antioxidant protection, and as part of longevity-focused health protocols.

Each ingredient is included because it enhances the effectiveness of the others at a mechanistic level. Vitamin C from acerola and L-ascorbic acid recycles quercetin back to its active antioxidant form after it neutralises free radicals, extending its protective window. Zinc is included because quercetin acts as a zinc ionophore, it facilitates zinc transport into cells, where zinc performs critical immune and antiviral functions. Without meaningful zinc present, this ionophore mechanism cannot fully operate. Oleuropein adds a complementary anti-inflammatory pathway. Vitamin D3 supports normal immune function through a distinct mechanism. The result is a formula where all six ingredients work together rather than six ingredients that happen to be in the same capsule.

A zinc ionophore is a molecule that facilitates the transport of zinc ions across cell membranes into the intracellular environment. Zinc inside cells can inhibit viral replication enzymes and support immune cell signalling, but zinc on its own has limited ability to cross cell membranes unaided. Quercetin acts as a natural zinc ionophore, it actively carries zinc across the membrane, enabling intracellular zinc concentrations that support immune and antiviral function significantly more effectively than zinc supplementation alone.

Oleuropein is a polyphenol derived from olive leaf, well studied for its antioxidant, antimicrobial, and anti-inflammatory properties. It inhibits NF-kB, a key transcription factor that regulates the expression of pro-inflammatory genes, adding a complementary anti-inflammatory pathway to quercetin's mast cell stabilisation and antioxidant activity. At 150mg per serving it is included at a meaningful dose, not as a trace ingredient for label purposes.

The recommended serving is 2 capsules per day, taken with water preferably with a meal. Taking with food improves absorption and reduces the small chance of digestive discomfort. There is no strong evidence that time of day significantly affects quercetin's absorption, so morning or lunchtime with a meal is a practical approach.

Quercetin's effects are cumulative rather than immediate. Most people taking a consistent daily dose notice changes in immune resilience and seasonal sensitivity within two to four weeks. For histamine-related benefits, studies suggest four to eight weeks of consistent supplementation produces the most meaningful results. The antioxidant and cellular protection effects operate continuously from the first dose but compound over time.

Yes. Quercetin Complex is designed to work as part of a broader supplement protocol. It pairs particularly well with Gly-NAC (which supports glutathione production for complementary antioxidant coverage) and with Broccoli Complex (which activates the Nrf2 antioxidant pathway through a distinct mechanism). Combined, these three products cover multiple antioxidant and immune pathways simultaneously.

Quercetin has a well-established safety profile at doses up to 1,000mg per day in clinical research, with no significant adverse effects reported at the 500mg per serving dose used in this formula. Long-term daily use at this dose is considered safe for healthy adults. As with all supplements, if you are taking prescription medication or managing a health condition, consult your GP before beginning supplementation.

Yes. All six active ingredients, the capsule shell (vegetable cellulose), and all excipients are vegan-friendly. The product is also non-GMO and free from gluten, dairy, soy, and artificial additives.

Quercetin may interact with certain medications. It can inhibit CYP3A4, an enzyme involved in metabolising a number of drugs, potentially affecting their plasma concentrations. It may also interact with blood-thinning medications, certain antibiotics, and immunosuppressants. If you are taking any prescription medication, consult your GP or pharmacist before use. This is a precautionary note rather than a contraindication, but it is important information for anyone on a regular medication regimen.

We recommend consulting a healthcare professional before taking any food supplement during pregnancy or breastfeeding. While quercetin is a naturally occurring plant compound, the concentrated doses in supplement form exceed typical dietary intake levels, and its safety in pregnancy has not been fully established in clinical trials.

This product is free from all 14 major allergens listed under UK food labelling regulations, including gluten, dairy, soy, tree nuts, peanuts, sesame, fish, crustaceans, molluscs, mustard, celery, lupin, sulfur dioxide, and eggs. It is also non-GMO.

Vitamin C serves two roles in this formula. First, it supports normal immune function independently, a well-established EU-permitted health claim. Second, and more importantly for the formula's design, vitamin C regenerates quercetin after it has been oxidised through its antioxidant activity. When quercetin neutralises a free radical it becomes oxidised itself. Vitamin C donates an electron to restore quercetin to its active reduced form, effectively extending the duration of quercetin's protective activity. This is why both acerola extract (a natural vitamin C source rich in co-factors) and L-ascorbic acid are included.

Vitamin D3 at 12.5 micrograms per serving contributes to the maintenance of normal immune function, a permitted EU health claim supported by substantial clinical evidence. Vitamin D deficiency is highly prevalent in the UK population due to limited year-round sunlight, and sub-optimal vitamin D status is associated with impaired immune response and increased susceptibility to respiratory infections. Including vitamin D3 in this formula addresses a gap that affects many of the formula's target users.

Quercetin is derived from Sophora japonica, the Japanese pagoda tree, one of the richest natural plant sources of quercetin. This source is standard in premium quercetin supplements and provides a highly purified quercetin extract at consistent potency.

No. The formula contains only the six active ingredients listed on the label and a vegetable cellulose capsule shell. There are no magnesium stearate, silicon dioxide, microcrystalline cellulose used as a filler, titanium dioxide, or other manufacturing excipients commonly found in cheaper supplement products.

UK standard delivery takes 1 to 3 business days. Orders are dispatched from our UK fulfilment centre.

Store in a cool, dry place away from direct sunlight. Keep out of reach of children. Do not store in a humid environment such as a bathroom cabinet.

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