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4.8 stars from 421 reviews | Trusted by +250k Customers
Worried About Getting Sick? Z-Stack Keeps You Strong.
Stay strong for your grandkids with Dr. Zelenko's original formulation for daily immune support.
Stay strong for your grandkids with Dr. Zelenko's original formulation for daily immune support.
4-in-1 Stack (Zinc, Quercetin, Vitamin C & D3)
Helps Protect Against Infections at the Cellular Level
All-Natural, Non-Toxic Ingredients
4.8 stars from 421 reviews
Trusted by +250k Customers
Worried About Getting Sick?
Z-Stack Keeps You Strong.
Transform Your Immune Health With Z-Stack
Stronger Immunity
Vitamin C and zinc team up to strengthen your immune system and help defend against daily threats.
Inflammation Support
Quercetin promotes a calm, balanced immune response—so your body stays resilient, even under stress.
Enhanced Absorption
Quercetin boosts the uptake of Vitamin C, maximizing its benefits for energy and cellular health.
Bone & Muscle Strength
Vitamin D3 improves calcium absorption to support bone density, muscle recovery, and immune defense.
All you need is just 2 capsules a day to help keep you protected and ready to enjoy life.
40%
of hospital patients are seniors, though they’re only 13% of the population.
80%
of all COVID-related deaths in the U.S. occurred in people over 65.
These numbers show just how critical it is to strengthen your immune system as you age.
Powerful Ingredients for Immune Support
Zinc (30mg)
The same mineral that proved effective in his clinical work.
Quercetin (500mg)
Natural zinc-ionophore that helps zinc penetrate infected cells.
Vitamin C (800mg)
Essential for optimal immune function and cellular protection.
Vitamin D3 (5000 IU)
Supports balanced, resilient immune response.
Meet Dr. Vladimir "Zev" Zelenko
The board-certified family physician who risked everything to protect his patients and left behind a simple formula that's still protecting families across America.
Medical Credentials
Summa cum laude in Chemistry - Hofstra University
M.D. from SUNY Buffalo School of Medicine
Family Medicine Residency - South Nassau Hospital, Oceanside, New York
Served a close-knit Orthodox Jewish community in Monroe, NY
"When COVID hit his community hard in 2020, he couldn't tell his patients there was nothing they could do. So he developed what became known worldwide as the "Zelenko Protocol."
The Results Speak For Themselves
Success Rate
99.96%
Dr. Zelenko treated over 600 high-risk COVID patients in early 2020.
Global Attention
His story and success were quickly picked up by national figures like Steve Bannon, Sean Hannity, and Rudy Giuliani.
Presidential Recognition
In March 2020, Dr. Zelenko wrote a direct letter to President Trump. The President publicly acknowledged the protocol, giving it massive credibility.
When Big Pharma Blocked His Protocol
By the end of 2020, pharmacies stopped filling prescriptions for Dr. Zelenko’s original treatment. Doctors were warned not to go against official guidance or risk losing their license.
So he found another way. That’s when he discovered that quercetin, a natural plant compound, could help zinc enter cells, just like hydroxychloroquine.
And Z-Stack was created.
That’s why Z-Stack became a lifeline, especially for older Americans, who face the greatest risk when their immune systems weaken.
Join 250,000+ Americans Who Trust Z-Stack
Get Immunity Protection For Less Than A Cup of Coffee
4.8 stars from 421 reviews | Trusted by +250k Customers
Subscribe & Save Up To 18%
$55.00 $45.10 per bottle
It's just $1.50 per day
Choose Your Protection:
Free Shipping in the US
Cancel or pause anytime
Delivered on your schedule
Never run out — peace of mind every month
Pay in 4 interest-free installments of $13.75 with ShopPay
Quality Zinc: $18
Quercetin 500mg: $32
Vitamin C 800mg: $15
Vitamin D3 5000 IU: $20
Total: $85+ per month
Z-Stack gives you all four for just $45.10
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Z-Stack vs. Other Immune Supplements
The Science Behind Z-Stack
There are over 35,000 published studies on the ingredients in Z-Stack, Showing their role in immune health, inflammation reduction, and cellular defense.
Clinical Study Highlight:
One 2021 study published in the International Journal of Antimicrobial Agents confirmed what Dr. Zelenko had been saying all along: “The combination of HCQ, AZM, and zinc, also known as the Zelenko protocol, has been shown to reduce hospitalization and mortality significantly…”
Third-Party Testing Standards
And every batch of Z-Stack is rigorously tested for purity and potency, including:
Heavy metals screening
Pesticide contamination testing
Microbial safety verification
Potency validation
Certificate of Analysis available by batch number
How Z-Stack Protects You at the Cellular Level
Simple 3-Step Process:
Daily Protection
Take 2 capsules. No complicated timing or multiple bottles to remember.
1
Cellular Defense
Quercetin acts as a "zinc taxi," delivering zinc directly into your cells where it can stop threats before they spread.
2
Immune Optimization
Vitamins C and D3 work synergistically to strengthen your body's natural defenses and maintain optimal immune function.
3
Why This Combination Works
Most people take zinc alone and wonder why it doesn't help. The secret is the zinc-ionophore effect. Quercetin helps zinc penetrate cell walls.
Frequently Asked Questions
Is Z-Stack safe to take with my other medications?
Z-Stack contains natural vitamins and minerals. However, we always recommend consulting your healthcare provider before starting any new supplement, especially if you're taking prescription medications.
How long before I feel the benefits?
Each product is designed for simplicity and ease of use. Please refer to the product packaging or our website for specific instructions on how to get the best results.
Is the formula still the same after Dr. Zelenko's passing?
We prioritize recyclable, compostable, and reusable packaging materials. Most of our packaging is plastic-free, and when plastic is necessary, we use recycled or biodegradable alternatives.
Can my whole family take Z-Stack?
Yes! We carefully select our suppliers and materials to ensure they meet our sustainability standards, from ethically sourced ingredients to responsibly harvested materials.
Why is Z-Stack more expensive than generic immune supplements?
You're paying for doctor-formulated precision, clinical-grade dosages, third-party testing, and USA manufacturing. Generic supplements often use ineffective lower amounts that don't work when you need them most.
References
1[Ried K, BinJemain T, Sali A. Therapies to Prevent Progression of COVID-19, Including
Hydroxychloroquine, Azithromycin, Zinc, and Vitamin D3 With or Without Intravenous Vitamin C
: An International, Multicenter, Randomized Trial. Cureus. 2021 Nov 25;13(11):e19902. doi:
10.7759/cureus.19902. PMID: 34976511; PMCID: PMC8712288.]
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