Give your family a Z-Care: Boost their immune system with the Zelenko treatment protocol and essential vitamins to fight off flu and viruses.

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“Finally An Immunity Product Backed by Care.”

Your immune system can be weakened by over 300 different primary immunodeficiency disorders, poor diet,
lack of sleep, and adverse reactions to various vaccines.

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  • Z-Stack® is one of Dr. Zelenko’s premier products that he specifically designed. With decades of experience in the medical field, the knowledge Dr. Zelenko has gained over the years led to him formulating his own supplement, which we now know as Z-Stack™.


Z-Shield is a detox supplement that targets dormant viruses and parasites. It contains St. John’s Wort, Lemon Balm, Turmeric, NAC, and EGCG to boost immunity and eliminate toxins. Promotes healing and defense against infections.

Z-Stack Kids®

Introducing Zelenko all-in-one adult immune-boosting super formula, now specially formulated for kids! Give your children or grandchildren the immune support they need with the delicious taste of Pineapple. With no artificial flavoring or coloring, 78% less sugar, and Kosher certification, it’s the perfect choice for their well-being.


Introducing Zelenko’s all-in-one adult immune-boosting super formula! Packed with essential nutrients like zinc, vitamin C, and vitamin D, it supports a strong immune system. Our formula also includes elderberry, known for its antioxidant properties and potential to ease cold and flu symptoms. Get the ultimate defense against illnesses with our high-concentration elderberry extract for superior bioavailability. 


Dr. Zelenko’s groundbreaking work on the immune system has led to the creation of Z-DTox™, a supplement containing powerful ingredients such as EGCG, N-acetyl cysteine, zinc, vitamin C, and vitamin D. This unique blend aims to support immune cell development, tissue repair, and detoxification. Ideal for those concerned about immune deficiencies or adverse vaccine side effects.

Frequently Asked Questions

Who was Dr. Vladimir Zelenko?

Dr. Vladimir Zev Zelenko, M.D., was a family doctor who was licensed by the board. Dr. Zelenko used to be a family doctor in the Hudson Valley of New York. He was like a part of the family to thousands of his patients, and he advised the volunteer ambulance corps in Kiryas Joel, New York. Dr. Zelenko was known for creating the “Zelenko Protocol,” which has saved many lives around the world.

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

Albert Szent-Gyorgyi, who won the Nobel Prize, was the one who found quercetin. Quercetin is a zinc ionophore that helps fight free radicals, viruses, and more.

Quercetin is good for your health in a number of ways. Peer-reviewed research suggests that Quercetin might be able to help lower inflammation and boost the immune system.

A lot of study, including clinical trials, has been written up by scientists about quercetin.

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

Zinc is found in all of the body’s cells. It helps the immune system fight off bacteria and viruses that are trying to get in. Zinc is important for our immune system because it changes how our cells respond to infections. It can also keep inflammation from getting out of hand.

Zinc turns on more of the cells in the body that are in charge of fighting off infections. It also turns on enzymes that break down the proteins in viruses and bacteria, making it less likely that they will spread.

Due to its direct antiviral properties, it is possible that giving zinc in a safe way is good for most people, especially those who don’t have enough zinc in their bodies.

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

A healthy immune system needs vitamin D because it starts the adaptive immune reaction. It helps make a protein called cathelicidin, which can help stimulate T cells to help the immune system respond. During the winter, when vitamin D levels are usually lower, the link between vitamin D and viral illnesses was seen.

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

Vitamin C, also called ascorbic acid, is a water-soluble vitamin that helps keep the nervous system healthy. Vitamin C helps the immune system by helping the cells of both the natural and adaptive immune systems do their jobs. Vitamin C must come from the food you eat every day because our bodies can’t make it.

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

The FDA hasn’t looked into how well this product treats or stops COVID-19. If you want more information, please look at peer-reviewed journals, scientific data, and data from clinical studies.

Talk to your doctor before using this product and while you are using it, especially if you are nursing, pregnant, have a medical condition, or are taking medicine.


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