Collection: Best Quercetin Supplement in the US

At For Youth, you can buy one of the best quercetin supplements in the US — formulated with Quercetin Phytosome (Quercefit®) for up to 20x better absorption than standard quercetin. As we age, our immune system naturally becomes less efficient, leaving us more vulnerable to infections and inflammation. The Zombie is designed to reinforce your body’s natural defences. Quercetin helps modulate inflammation, support immune resilience, and protect your cells from oxidative stress. With The Zombie, you’re not just keeping your immune system strong — you’re building long-term defence against age-related decline.

  • (94 Reviews)

    The Zombie - Quercetin+

    Regular price From $45.00 SGD
    Regular price From $45.00 SGD Sale price $45.00 SGD

    The Zombie – with 500 mg Quercetin Phytosome – supports recovery after exercise and helps against inflammation.

  • (10 Reviews)

    The Cleanse - Spermidine+

    Regular price From $59.00 SGD
    Regular price From $59.00 SGD Sale price $59.00 SGD

    The Cleanse – Spermidine+ promotes renewal by activating autophagy, reducing inflammation, and clearing senescent cells.

  • (3 Reviews)

    The Starter Kit (NMN)

    Regular price From $115.00 SGD
    Regular price From $135.00 SGD Sale price $115.00 SGD

    Repair, protect, and cleanse your cells with The Base (NMN), The Grape and The Zombie for a complete approach to healthspan and longevity.

  • (182 Reviews)

    The Age Defence System

    Regular price From $150.00 SGD
    Regular price From $177.00 SGD Sale price $150.00 SGD

    Repair, protect, and cleanse your cells with The Repair (NMN+), The Protect and The Cleanse for a complete approach to healthspan and longevity.

Frequently Asked Questions

Quercetin supplements support immune health, reduce inflammation, and act as powerful antioxidants. Quercetin is a natural plant compound found in foods like onions, apples, and berries — but in supplements like Quercefit®, it’s optimised for much better absorption.

Quercetin supports a strong immune response, helps modulate inflammation, and protects cells from oxidative stress. Research also shows benefits for respiratory health, cardiovascular function, and even longevity through its senolytic activity.

Quercetin is generally well tolerated. Rare side effects may include headache or mild digestive upset. If you’re pregnant, breastfeeding, taking medication or managing a medical condition, check with your healthcare provider before use.

Some people may notice benefits such as better recovery or immune resilience within a few weeks. However, cellular and long-term health effects tend to build up over 4–8 weeks with consistent use.

Most quercetin supplements have poor bioavailability. For Youth uses Quercefit®, a clinically studied quercetin phytosome shown to have up to 20x better absorption than standard quercetin. It’s designed for real results — with purity, potency, and transparency in every capsule.

Overall product rating out of 5: 4.88
Based on 1,493 reviews
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Marsha Lyn
Singapore, SG
I recommend this product
The Lean (Green Tea + Beanblock) - 1 Bottle
It has stopped my satiety for food
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10 days ago
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Greg
Brisbane, AU
I recommend this product
The Clock (Biological Age Test) - 2 Tests
It has allowed me to track my biological age, however service is very slow
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10 days ago
Verified Customer
Rajini Aravind
I recommend this product
The Base - NMN 6 Pack
For my parents, it has made them a little more alert.
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12 days ago
Verified Customer
Bryan Chong
Singapore, SG
I recommend this product
The Repair - NMN+ - 1 Pack
Too early to tell for certain
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25 days ago
Verified Customer
Zoë
Singapore, SG
I recommend this product
The Repair - NMN+ 1 Pack (Subscription)
I have so much sustained energy. As a toddler mum, super important!
1 person found this review helpful.
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28 days ago
Verified Customer
Harun Thiruselvam
I recommend this product
The Plus (NR) - 3 Pack
Since incorporating The Plus – Niagen from For Youth into my daily routine, I’ve experienced a noticeable boost in sustained energy, mental clarity, and overall cellular vitality. It’s one of those supplements you feel working — from the inside out. Knowing it supports NAD+ levels and healthy aging at the cellular level gives me confidence, especially as someone committed to longevity and performance. At 66, I feel more focused and energised than many half my age. For Youth continues to impress with their dedication to quality, science-backed formulations, and dependable service. The Plus is a core part of my daily wellness strategy. — Dr. Marco Thiruselvam ( Malaysia)
1 person found this review helpful.
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1 month ago
Verified Customer
Harun Thiruselvam
I recommend this product
The Base (NMN) - 3 Pack
I’ve been taking The Base – NMN from For Youth as part of my daily routine, and the benefits have been remarkable. From increased energy and focus to a deeper sense of cellular vitality, this NMN formulation delivers what it promises. What truly sets it apart is For Youth’s uncompromising commitment to purity, quality, and scientific formulation. The product is clean, effective, and consistently reliable — and their customer service and delivery are just as impressive: fast, responsive, and dependable. For anyone serious about long-term cellular health and performance, The Base is a foundational supplement worth investing in. — Dr. Marco Thiruselvam ( Malaysia)
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1 month ago
Verified Customer
Harun Thiruselvam
I recommend this product
The Grape (Resveratrol) - 3 Pack
At 66, I can confidently say that The Grape – Resveratrol from For Youth has made a profound difference in how I feel every day. My mind feels clearer, my body more energized, and overall — I feel healthier than I ever have before. It’s rare to come across a supplement that delivers such noticeable results, but this one does — consistently. Backed by For Youth’s dedication to quality and purity, The Grape has become an essential part of my wellness routine. Highly recommended for those who want to feel their best at any age. — Dr. Marco Thiruselvam (Malaysia)
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1 month ago
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Harun Thiruselvam
I recommend this product
The Protect - Glutathione+ 3 Pack
At 66, I feel better than ever — healthier, mentally sharper, and remarkably resilient. Since adding The Protect – Glutathione from For Youth to my regimen, I haven’t fallen ill once — not even a cold or flu. My skin remains smooth and virtually wrinkle-free, and the difference in muscle recovery after HIIT and weight training has been phenomenal. I know glutathione is vital for liver support and cellular detox, and this product truly delivers on all fronts. For Youth’s dedication to clean, high-quality formulations makes this a standout. The Protect is now a non-negotiable part of my wellness routine. — Dr. Marco Thiruselvam ( Malaysia)
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1 month ago
Verified Customer
Harun Thiruselvam
I recommend this product
The Zombie (Quercetin) - 3 Pack
The Zombie – Quercetin from For Youth has been a game-changer in my daily regimen. I’ve been using it for over a year now, and its impact on my immune resilience, energy levels, and inflammation control has been outstanding. At 66, I feel sharper, stronger, and more physically active than ever — and The Zombie plays a big role in that. I especially value its natural antioxidant and senolytic properties, supporting cellular cleanup and healthy aging. Backed by For Youth’s commitment to quality and scientific formulation, The Zombie is one supplement I trust — and will continue to rely on. — Dr. Marco Thiruselvam ( Malaysia)
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1 month ago
Verified Customer
Curly Lin
Singapore, SG
I recommend this product
The Repair - NMN+ - 1 Pack
Feeling energised and reduced brain fog.
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1 month ago
Verified Customer
Michael Schaerer
I recommend this product
The Repair - NMN+ - 3 Pack
I’m not sure it’s actually doing anything but can you afford to not take it? :)
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2 months ago
Verified Customer
John Rogers
I recommend this product
The Base - NMN 6 Pack
Long term health
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2 months ago
Verified Customer
Lorna Shuttlewood
I recommend this product
The Unwind (Magnesium + L-theanine) - 3 Pack
Good for evening relaxation
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2 months ago
Verified Customer
Lorna Shuttlewood
I recommend this product
The Protect - Glutathione+ - 3 Pack
Very good still early days
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2 months ago
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