How much quercetin is in an apple?

Apples. – 5 mg per 100 g (roughly half an apple). Apples are probably the most common food that's a good source of quercetin.

lifeextension.com - 10 Foods High in Quercetin (+ 5 Benefits) - Life Extension

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We have all heard the health pitch, "an apple a day keeps the doctor away," but do we know why? In addition to being a great source of fiber and vitamins, apples are a great source of health-promoting polyphenols like quercetin. If you haven't heard of quercetin, you're certainly not alone; zinc and vitamins C and D tend to get all the credit when it comes to immune health support. Strange name notwithstanding, however, quercetin might be the most underrated nutrient in your diet. And its benefits go well beyond shoring up your body's natural defenses.

So what is quercetin—and aside from apples, what other foods can you find it in?

What is quercetin?

Quercetin belongs to a group of plant compounds known as dietary flavonoids, which are a type of polyphenol that makes up the basis for pigments of many different plants. That's why you always hear advice to "eat the rainbow"—those brightly colored fruits and vegetables get their bold hues from health-promoting flavonoids. Quercetin is a true stand-out among other flavonoids, though, because it has many unique—and beneficial—biological properties.

5 quercetin benefits

How, specifically, does quercetin benefit your health? Here are five important ways this flavonoid supports you from head to toe: Immune system health – Quercetin is an antioxidant which certainly belongs on our list of immune supporting supplements. In a large randomized-controlled trial, 12 weeks of quercetin intake (1000 mg daily) compared to placebo, produced beneficial effects including a smaller number of days of experiencing immune challenges related to the upper respiratory tract. Promotes a healthy inflammatory response – Inflammation is a normal part of the human experience; what matters is whether your body responds in a healthy way…and quercetin appears to promote exactly that. In a meta-analysis of clinical trials, quercetin supplementation in a subgroup was associated with maintaining already-healthy levels of cytokines such as C-reactive protein. Healthy cells – Senescent cells are the old cells that accumulate with aging. Quercetin is increasingly achieving recognition as a senolytic, meaning it helps remove these undesired cells—leaving the healthy, youthful, properly functioning cells to do their jobs. Supports already-healthy blood pressure – A meta-analysis of clinical trials found that supplementing with 500 mg or more of quercetin helped maintain blood pressure in healthy ranges. Already-healthy blood sugar support – A separate study found that this same dosage of quercetin also supported already-healthy blood sugar levels.

10 Foods High in Quercetin

So now that you know how many health benefits quercetin can deliver, the question is—how can you get more of this dietary flavonoid on your plate? Check out our food list below and discover some delicious ways to increase your intake of the most underrated nutrient we can think of! (Note that as is always the case with produce, the amount of nutrients per serving will vary according to the crop.)

Fruits high in quercetin

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Strange purple cocktail removes 2.7lbs every 4 days

This effective juice jolts the metabolism, boosts energy and burns fat all day.

Learn More »

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What days are the most contagious for Omicron?

We know that people tend to be most infectious early in the course of their infection. With Omicron, most transmission occurs during the one to two days before onset of symptoms, and in the two to three days afterwards.

health.harvard.edu - If you've been exposed to the coronavirus - Harvard Health

August 25, 2022

If you've been exposed to someone with COVID-19 or begin to experience symptoms of the disease, you may be asked to self-quarantine or self-isolate. What does that entail, and what can you do to prepare yourself for an extended stay at home? How soon after you're infected will you start to be contagious? And what can you do to prevent others in your household from getting sick?

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Podcast:

You think you've got COVID-19. Here's what you need to do (recorded 4/10/20) We asked Dr. Mallika Marshall, medical reporter for CBS-affiliate WBZ TV in Boston and an instructor at Harvard Medical School, how we should react when we start to experience a dry cough or perhaps spike a fever. Who do you call? How do you protect your family? When does it make sense to move toward an emergency department, and how should we prepare? Dr. Marshall is the host of Harvard Health Publishing's online course series, and an urgent care physician at Mass General Hospital.

Visit our Coronavirus Resource Center for more information on coronavirus and COVID-19.

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