Premier all-natural supplements
developed by Dr. Zev Zelenko.

Your immune system can be weakened by poor diet, lack of sleep, and countless other environmental factors.
Explore how our products may help support your body's natural defenses.

A Dr. Zelenko Vitamin

Support detoxing your body
from harmful elements.

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Zelenko Kids Vitamin Zelenko Kids Vitamin

Kids Z-Stack®
A Dr. Zelenko Vitamin

The Z-Stack Protocol – just for kids.

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Zinc Immune Support

Zinc is one of the active ingredients in
Z-Stack®. It is one of the most well
known immune support ingredients
to date.

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Dr. Zelenko Z-Stack Supplement Dr. Zelenko Z-Stack Supplement

Quercetin-based Nutrients

Quercetin is a leading active ingredient
in Z-Stack. Being a plant flavonol,
Quercetin is a natural source
of vital nutrients.

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Z-DTox Vitamins Dr Zelenko Z-DTox Vitamins Dr Zelenko
Z Stack Dr. Zelenko


Developed to support detoxing your body from harmful elements that can stay in our tissues and bloodstream.

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Z-Flu Vitamins Dr Zelenko Z-Flu Vitamins Dr Zelenko


Z-Flu has all the same
ingredients you have come
to love about Z-Stack –
plus Elderberry in a unique
gummy delivery system.

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Our Vitamins are:

- Kosher Certified
- GMP Certified
- Made in the USA

We ensure the quality of our formula through
various certifications such as GMP and Kosher.

Z Stack Dr. Zelenko
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Frequently Asked Questions

Who was Dr. Vladimir Zelenko?

Dr. Vladimir Zev Zelenko M.D. was a board certified family physician. Dr. Zelenko had practiced family medicine in New York’s Hudson Valley.  He has been described by his patients as a family member to thousands of families, and was a medical adviser to the volunteer ambulance corps in Kiryas Joel, New York. Dr. Zelenko was known for developing his now famous “Zelenko Protocol,” which has saved countless lives worldwide.

+ Click here to read more about Dr. Vladimir Zelenko

What is Quercetin & How Does It Support the Immune System?

Quercetin was discovered by the Nobel Prize winner Albert Szent-Gyorgyi. Quercetin, a zinc ionophore, is known for its antioxidant activity, antiviral activity, and more.

Quercetin has a number of great health-promoting benefits. Peer reviewed literature shows potential benefits of Quercetin include the ability to help reduce inflammation and to improve the immune system.

The scientific community has published a significant amount of research on quercetin, including clinical trials.

What is Zinc & How Does It Support the Immune System?

Zinc is found in cells throughout the body. It helps the immune system fight off invading bacteria and viruses. Zinc is essential for our immune system because it affects how our cells respond to infections. It can also help keep inflammation under control.

Zinc increases the activation of cells in the body that are responsible for fighting infection. It also activates enzymes that break down proteins in viruses and bacteria to reduce the chances of spreading.

Due to its direct antiviral properties, it can be assumed that safe zinc administration is likely beneficial for most of the population, especially those with suboptimal zinc status.

What is Vitamin D & How Does It Support the Immune System?

Vitamin D is essential to a healthy immune system as it initiates the adaptive immune response. It promotes the expression of a protein called cathelicidin which can promote the stimulation of T cells to help support an immune response. The link between vitamin D and viral infections was observed during winter months when vitamin D levels are generally lower.

What is Vitamin C & How Does It Support the Immune System?

Vitamin C, or ascorbic acid, is a water-soluble vitamin well known for its role in supporting a healthy immune system. Vitamin C contributes to immune defense by supporting various cellular functions of both the innate and adaptive immune system. Because our bodies cannot make vitamin C, it must come from the foods you eat every day.

Will Z-Stack® Treat or Prevent COVID-19?

The FDA has not evaluated this product to treat or prevent COVID-19.  Please see peer reviewed journals, scientific data and clinical trials data for more information.

Always consult with your physician before using and while using this product (especially if nursing, pregnant, have medical condition(s) and/or are taking medication). 

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