Name: O2B Quercetin Plus
Brand: O2B Healthy
SKU: O2B458
Price: 59.95 NZD
Availability: InStock

Immune balance. Glutathione support. Cellular protection.

Supports normal thyroid hormone metabolism

Supports immune system wellbeing

Includes antioxidant support

$59.95

Tax included. Shipping calculated at checkout.

90 Capsules

Quantity

O2B Quercetin Plus combines quercetin, NAC, MSM and essential vitamins and minerals to support immune balance, glutathione production, antioxidant protection and cellular wellbeing.

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Details +

Comprehensive antioxidant and immune support

O2B Quercetin Plus brings together six complementary ingredients selected to support normal immune function, antioxidant defences and cellular wellbeing.

Featuring Quercetin, N-acetyl-L-cysteine (NAC), MSM, Vitamin C , Zinc and Vitamin D, this formula provides nutritional support for several interconnected processes involved in maintaining healthy cells, tissues and immune responses.

Quercetin: supporting immune balance and cellular protection

Quercetin is a naturally occurring flavonoid found in foods such as onions, apples, berries and leafy vegetables.

It has attracted considerable scientific interest for its antioxidant properties and interactions with cellular pathways involved in inflammatory and immune signalling.

Each serving of O2B Quercetin Plus provides 300 mg of quercetin, helping complement the body's natural antioxidant defences and support a balanced inflammatory response.

NAC: supporting glutathione production

N-acetyl-L-cysteine (NAC) is a source of cysteine, an amino acid required for the body's production of glutathione.

Glutathione is one of the body's most important intracellular antioxidants, helping maintain normal cellular function and protect against oxidative stress.

NAC also has well-established mucolytic properties, making it relevant to respiratory wellbeing. Each serving of O2B Quercetin Plus provides 200 mg of NAC to support the body's normal glutathione-producing pathways.

MSM: sulphur and connective tissue wellbeing

MSM (methylsulfonylmethane) is an organic sulphur-containing compound used in supplements for connective tissue and joint wellbeing.

Sulphur is an important element in many biological molecules, including certain amino acids and proteins.

MSM has also been investigated for its potential effects on oxidative stress, inflammatory signalling and exercise-related recovery, providing complementary support within the Quercetin Plus formula.

Vitamin C, Zinc and Vitamin D: essential immune nutrients

Healthy immune function depends on an adequate supply of essential vitamins and minerals.

Vitamin C supports normal immune-cell activity, collagen formation and antioxidant protection.

Zinc is required for normal immune function, tissue maintenance and the activity of numerous enzymes involved in cellular metabolism.

Vitamin D contributes to normal immune-system regulation and also supports muscle function and bone health.

Together, these nutrients provide a nutritional foundation alongside the formula's antioxidant and sulphur-containing compounds.

Supporting the body's antioxidant defence systems

The body naturally produces reactive oxygen species during energy metabolism, immune activity and other essential processes.

When reactive oxygen species exceed the body's capacity to manage them, oxidative stress can occur.

A considered approach to everyday wellbeing

Immune function, cellular energy metabolism and antioxidant protection are closely interconnected.

O2B Quercetin Plus brings together carefully selected nutrients and plant compounds to complement a balanced diet, adequate sleep and appropriate recovery, providing broad nutritional support for immune and cellular wellbeing.

FAQs +

What is O2B Quercetin Plus used for?

O2B Quercetin Plus is designed to support normal immune function, antioxidant protection, respiratory wellbeing, glutathione production and general cellular health.

What ingredients are in O2B Quercetin Plus?

Each capsule contains:

What is quercetin?

Quercetin is a naturally occurring plant compound belonging to the flavonoid family. It is found in foods including onions, apples and berries and is valued for its antioxidant activity.

How much quercetin is in each capsule?

Each capsule provides 300mg of quercetin. The label serving of one to three capsules provides 300–900mg daily.

What is NAC?

NAC stands for N-acetyl-L-cysteine. It is related to the amino acid cysteine and supports the body’s production of glutathione. NAC also helps support normal mucus clearance in the respiratory tract.

How much NAC is in each capsule?

Each capsule provides 200mg of NAC. Three capsules provide 600mg.

Why are vitamin C, vitamin D and zinc included?

Vitamin C, vitamin D and zinc all contribute to normal immune-system function. Vitamin C also supports antioxidant activity and collagen formation, while vitamin D has additional roles in bones and muscles.

What is MSM doing in an immune formula?

MSM is a sulfur-containing compound included to broaden the formula’s cellular and connective-tissue support profile. Each capsule provides 200mg of MSM.

How many capsules should I take?

Adults take one to three capsules together with food daily, or as directed by a healthcare professional.

Why should I take the capsules with food?

Taking the formula with a meal may make a multi-ingredient supplement easier to tolerate and provides dietary fat that can assist the absorption of fat-soluble vitamin D.

Can I take it while recovering from an illness?

It may be considered as nutritional and antioxidant support while returning to your usual routine, provided the ingredients are suitable for you.

It does not treat post-viral symptoms or replace assessment and care from a healthcare professional. Seek medical advice for ongoing fatigue, breathing difficulty, chest symptoms or a recovery that is not progressing as expected.

Does Quercetin Plus support respiratory health?

NAC supports normal respiratory mucus clearance and glutathione production.

Is Quercetin Plus suitable for seasonal wellbeing?

Quercetin is a plant flavonoid researched for its antioxidant and immune-signalling properties. It may be included in a broader seasonal-wellbeing routine.

Can I take Quercetin Plus with O2B Viro-go?

Both are multi-ingredient immune-support formulas and may duplicate vitamin C, zinc and other immune-support ingredients.

Do not automatically combine them. Compare both ingredient panels and ask a healthcare professional which formula is most appropriate for your needs.

Can I take it with separate NAC, zinc, vitamin C or vitamin D?

Check the total amount supplied by every product. Taking three Quercetin Plus capsules already provides 600mg NAC, 300mg vitamin C, 15mg zinc and vitamin D equivalent to 750IU according to the listed formula.

Can I take it with prescription medication?

Consult your doctor or pharmacist first. Quercetin, NAC, zinc and other supplement ingredients may interact with medicines or affect how some medications are absorbed or metabolised.

Can I take Quercetin Plus during pregnancy or breastfeeding?

Consult your healthcare professional before use during pregnancy or breastfeeding. The current product directions specifically recommend seeking professional advice.

Is Quercetin Plus suitable for children?

The supplied directions are written for adults. Do not give the product to a child unless a qualified healthcare professional has advised an appropriate serving.

Can I take it every day?

The product is formulated for one to three capsules daily with food. Follow the label and review ongoing use with a healthcare professional if you take medication, manage a health condition or use several other supplements.

Is Quercetin Plus a replacement for a healthy diet?

No. A supplement cannot replace adequate protein, fruit and vegetables, sleep, hydration and appropriate healthcare. Use it as one part of a broader wellbeing routine.

Directions & Precautions +

Suggested Dose:

Take 1 – 3 capsules with food per day or as directed by your healthcare practitioner. If taking the maximum, spread doses across the day for better absorption.

Cautions and Warnings:

If taking prescription medication, pregnant, nursing or you have known ingredient sensitivities please consult your health care professional before taking this product.

Ingredients +

Ingredient	Amount	Role in Antioxidant & Immune Support
Quercetin	300 mg	Provides antioxidant support and helps maintain a healthy immune and inflammatory response
MSM (Methylsulfonylmethane)	200 mg	Provides a source of sulphur and supports connective tissue health and a healthy inflammatory response
NAC (N-Acetyl-L-Cysteine)	200 mg	Supports glutathione production, antioxidant defences and healthy respiratory function
Vitamin C	100 mg	Provides antioxidant protection and supports normal immune function and collagen production
Zinc	5 mg	Supports normal immune function, antioxidant protection and tissue repair
Vitamin D	2.5 mg (equiv. 250 IU)	Supports healthy immune function, calcium absorption, bone health and normal muscle function
Encapsulating aids

Who O2B Quercetin Plus is for?

You may also feel as though your immune system is constantly being tested: children bring bugs home from kindy, the office passes illnesses around, travel disrupts your sleep or a demanding month leaves you feeling run-down.

O2B Quercetin Plus may suit adults who:

Want additional immune and antioxidant support during demanding periods
Are gradually returning to their normal routine after being unwell
Want nutritional support for normal respiratory function
Spend time around schools, childcare, crowded workplaces or frequent travellers
Find that stress, poor sleep or a busy schedule makes self-care harder to maintain

Why take O2B Quercetin Plus?

You may begin with vitamin C, add zinc, hear about vitamin D, then consider quercetin and NAC. Before long, you are managing several bottles, checking overlapping ingredients and trying to remember different serving instructions.

O2B Quercetin Plus is designed to make that routine more manageable by
giving you one organised formula when you want to support your immune system, antioxidant defences and respiratory wellbeing without coordinating multiple separate products.

How to take O2B Quercetin Plus

Take with food

Take 1 - 3 capsules daily

What You Can Count On

Made By Us

We have made human and pet supplements in our purpose-built factory in Nelson, New Zealand since 2003.

Quality Control

Trust is important to us. We operate under compliance procedures verified by MPI and we lab test every product we make.

Free Shipping in NZ

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Made in Nelson, New Zealand

We’ve been manufacturing natural health supplements for over 20+ years in our purpose built facility. We take a nutrition based approach to health and believe that what you put in, is what you get out. That’s why we use natural ingredients and science backed formulations to develop our products, ensuring you get the highest quality products made locally.