Quercetin Zinc – Immune Support with Vitamin C and D3 | 120 or 300 Capsules

Quercetin Zinc is a daily immune support supplement with 530 mg of quercetin, 7.5 mg of zinc (from zinc ascorbate), 120 mg of vitamin C and 25 mcg of vitamin D3 in every 2-capsule serving, plus 50 mg each of bromelain and stinging nettle root. It comes in bottles of 120 or 300 vegetarian capsules and supports normal immune function.†

Quercetin Zinc is for adults who want everyday immune support without lining up four bottles on the counter. Zinc, vitamin C and vitamin D3 are three nutrients your immune cells lean on, and quercetin is the plant flavonoid people pair with them.† Two capsules with a meal and you're done.

You don't need to wait until your 60s to care about this. If you're in your 30s or 40s and already paying attention to sleep, training and what's on your plate, this is the easy part of the routine. Small, steady habits now are how you add life to your years later.

Why people take Quercetin Zinc

• Supports normal immune function with zinc, vitamin C and vitamin D3, three nutrients immune cells depend on.†
• Delivers 530 mg of quercetin, a plant flavonoid studied for its antioxidant activity.†
• Supports the body's normal antioxidant defenses with zinc and vitamin C.†
• Covers 133% of the Daily Value for vitamin C, 125% for vitamin D and 68% for zinc in one daily serving, to help fill gaps in your diet.†

What's in each serving

Serving size: 2 capsules. Servings per container: 60 in the 120-count bottle and 150 in the 300-count bottle, as printed on each bottle's Supplement Facts panel. Other ingredients: Cellulose (from capsule shell), Calcium Phosphate, Magnesium Stearate, and Silicon Dioxide. The label states: "NO soy, salt, yeast, gluten, milk & egg products, sugar, starch, or preservatives." It also states: "This product does not contain genetically modified materials."

How Quercetin Zinc works

Quercetin: 530 mg per serving

Quercetin is a flavonoid, a plant compound found in small amounts in fruits and vegetables. Food gives you a little. A supplement gives you a lot more than a normal diet does (a safety review of quercetin supplements makes the same point): 530 mg per serving here, or 265 mg per capsule. In lab tests quercetin behaves as an antioxidant, which is why people take it for antioxidant support.†

Here's what the human research shows. Quercetin does get absorbed. In a 2-week randomized trial in 35 healthy adults, taking 50 to 150 mg a day raised blood quercetin levels in step with the dose (up 178% to 570% from baseline), with big differences from person to person. What it doesn't show: the same trial found no change in blood antioxidant capacity or inflammation markers. So, straight talk: quercetin reaches your bloodstream, and what that does for healthy adults is still being worked out. Our 530 mg is well above the doses in that trial, so its numbers don't map one-to-one.

Zinc: 7.5 mg from zinc ascorbate

Zinc is an essential mineral, so it has to come from food or a supplement. Immune cells use zinc ions to pass signals inside the cell, on both the fast-acting innate side of the immune system and the slower, targeted adaptive side, and zinc has long been documented as part of the body's normal antioxidant defenses (a review of zinc's role in immune function).†

The zinc here is zinc ascorbate, which is zinc bound to ascorbic acid (vitamin C). The amount is moderate: 7.5 mg is 68% of the Daily Value, a top-up to the zinc you already eat, not a megadose. Even at the label's maximum of 4 capsules a day, the capsules give you 15 mg of zinc.

Why quercetin and zinc together

Zinc normally moves into cells through dedicated transporter proteins. In a lab study using a mouse liver cell line and artificial membranes, quercetin carried zinc across the membrane by itself, acting as what chemists call a zinc ionophore. That's a cell-and-test-tube finding, not a human trial: it's why the pairing is interesting, not proof it works that way in your body.

Vitamin C: 120 mg

Your body can't make vitamin C, so it has to come from food or supplements. Vitamin C is an antioxidant, and immune cells called neutrophils collect it and hold onto it. A review of vitamin C and immune function describes how it supports the normal work of both the innate and adaptive immune system.† The 120 mg here is 133% of the Daily Value.

Vitamin D3: 25 mcg

This is vitamin D3, cholecalciferol, the same form your skin makes from sunlight. Most people know vitamin D for bones, but B cells, T cells and antigen-presenting cells all carry vitamin D receptors and can make the active form of vitamin D right where they work. A review of vitamin D and the immune system explains how that lets vitamin D help regulate normal innate and adaptive immune responses.† The 25 mcg here is 125% of the Daily Value.

Bromelain and stinging nettle root: 50 mg each

Bromelain is a group of protein-digesting enzymes from pineapple. Stinging nettle root comes from the same plant you've probably brushed against on a hike and regretted. Both are supporting players at 50 mg each, and we won't dress them up: we haven't found good human research on either one at these amounts for immune support, so we don't make claims for them.

How to take Quercetin Zinc

Take two capsules daily with a meal, or as directed by your health care provider. Do not exceed 4 capsules daily.

A practical tip: tie it to the meal you never skip, so the habit sticks. If you take other products with zinc, vitamin D or quercetin, add up the totals (see the FAQ below).

Ask your healthcare practitioner before use if you are pregnant, nursing, taking medication, or have a medical condition.

Don't take our word for it

• Checked off the shelf. When an outside lab bought our Quercetin Zinc off the shelf in 2022, it tested at 104% of its label claim.
• Verified by independent labs. ISO 17025-accredited labs check our test results.
• Every ingredient lot tested before use. Federal rules only require an identity test on incoming dietary ingredients. We test every incoming lot for identity, potency, heavy metals and microbes.
• If it misses spec, it doesn't go in a bottle. More than 99% of our tests pass, and the lots that don't are turned away.
• A certificate of analysis for every lot. Every lot of Quercetin Zinc has its own.

Made in the USA. Made and tested in Mt. Angel, Oregon. It's a farm town of about 3,500 people in the Willamette Valley, and our UL-certified cGMP facility there puts formulators, makers and testers under one roof. The owners work in the building too, and have since 2017. We've been making supplements in Oregon since 1974. That's 52 years, and we're not getting old either.

Frequently asked questions

How much quercetin is in Quercetin Zinc?

Each 2-capsule serving has 530 mg of quercetin, which works out to 265 mg per capsule. The same serving also gives you 7.5 mg of zinc, 120 mg of vitamin C, 25 mcg of vitamin D3, and 50 mg each of bromelain and stinging nettle root.

When should I take it, and does it need food?

Take it with a meal, at any time of day. The label doesn't name a time, so pick the meal you're most consistent with.

How long until I notice a difference?

Most people won't feel it day to day, and that's normal. Zinc, vitamin C and vitamin D do their work in the background of normal immune function, so the goal is steady daily intake, not a buzz.† In the trial above, blood quercetin levels rose within 2 weeks of daily use, but that's a lab number, not a feeling.

How long does a bottle last?

At two capsules a day, the 120-capsule bottle lasts 60 days and the 300-capsule bottle lasts 150 days, about five months.

Can I take Quercetin Zinc with other Mt. Angel Vitamins products?

Yes, but add up the overlap first. Our Zinc 50 mg Citrate Chelate plus a serving of Quercetin Zinc comes to 57.5 mg of zinc a day before food, more than five times the Daily Value (the two labels list 454% and 68%), so check with your practitioner before doubling up. Quercetin Nettle+ adds 1,000 mg of quercetin per 3-tablet serving. A safety review of quercetin supplements found side effects in human studies were rare and mild, but long-term data (beyond 12 weeks) at 1,000 mg a day or more aren't available yet, so run a months-long stack by your practitioner.

Is it OK to take with medication?

Ask your healthcare practitioner first. The same safety review notes that quercetin can change how much of certain drugs reaches your bloodstream, so your practitioner or pharmacist should see your full list before you start.

Is Quercetin Zinc vegetarian?

The capsules are. The label calls them vegetarian capsules, and the capsule shell is cellulose. The label doesn't make a vegan claim.

Keep learning

• How we source and test raw materials
• Quercetin Nettle+, a higher-quercetin tablet

References

1. Egert S et al. Daily quercetin supplementation dose-dependently increases plasma quercetin concentrations in healthy humans. J Nutr. 2008. PubMed
2. Wessels I et al. Zinc as a Gatekeeper of Immune Function. Nutrients. 2017. PubMed
3. Dabbagh-Bazarbachi H et al. Zinc ionophore activity of quercetin and epigallocatechin-gallate: from Hepa 1-6 cells to a liposome model. J Agric Food Chem. 2014. PubMed
4. Carr AC, Maggini S. Vitamin C and Immune Function. Nutrients. 2017. PubMed
5. Aranow C. Vitamin D and the immune system. J Investig Med. 2011. PubMed
6. Andres S et al. Safety Aspects of the Use of Quercetin as a Dietary Supplement. Mol Nutr Food Res. 2017. PubMed

†These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.