Your all-in-one immune boosting super formula.

Z-Stack® is one of Dr. Zelenko’s premier products that he specifically designed to support your body’s natural immune system.

With decades of experience as a family doctor, the knowledge Dr. Zelenko has gained over the years led to him formulating his own supplement which we now know as Z-Stack™.

Z-Stack is based on Dr. Zelenko’s years of extensive published scientific research – and now made available to you.

Enjoy free shipping for all US orders.

Z-Stack was developed with real, all-natural ingredients.

The ingredients in each capsule of Z-Stack weren’t chosen at random – they were chosen specifically for their natural ability to help support your immunse system and natural defense when you need it most

Explore the natural ingredients in

Top 4 most powerful Immune Support Supplements - All put into 1 capsule

Vitamin C

Supplementation of vitamin C has been found to improve components of the human immune system such as antimicrobial and natural killer cell activities.

Vitamin D supports a resilient immune system by fortifying your body defenses against bacteria and virsues.

Zinc is a nutrient found throughout your body, that helps your immune system and metabolism function. Evidence suggests that if zinc supplementation is started within 24 hours of cold/flu symptoms starting, the supplement can help shorten the duration of illness.

Quercetin promotes a healthy inflammatory response, while supporting sinus and upper respiratory health. This nutrient helps your body better absorb and utilize vital nutrients like Vitamin C.

Experience Dr. Zelenko’s premier care backed immunity supplemement. Use Z-Stack for daily prevention and for that extra boost of immune support when you need it most.

With ingredients like Vitamin C, D, Zinc and Quercetin these nutrients work synergestically to maximize absorption and support health cellular activity.

Free shipping on all orders

All Zelenko products feature fast, free shipping on all orders because we know how important it is to stay healthy.

Quality guaranteed

Dr. Zelenko built his legacy on the same products that bear his name to this day. Zelenko Labs stands behind its products with a 100% satisfaction guarantee.

Kosher, vegan, and gluten-free.

Z-Stack was forumulated to be safe, healthy, and taken by people from all walks of life.

About Us

Dr. Zelenko knew the importance of immune health for optimum wellness.

Each product from Z-Stack was built from Dr. Zev Zelenko’s critical research into natural immunity.

Z-Stack’s immune support properties mean it’s a wonderful preventative as well as a treatment for illness.

The zelenko protocol

Make Your Immune System Clean, Resilient, and Resistant

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-Shield™ | Detox Supplements -
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Z-Stack kids

Kids Z-Stack® | Your all-in-one kids immune boosting super formula for kids!

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What People Say About Us


My symptoms started 2 days ago. Just received my Z stack so I’m starting a little late. My plan is fruits, vegetables, lots of sunlight, and of course Z stack. I think I’m gonna be OK. Thanks Dr Z. 💪🏻😎👍🏻


I love this product. Dr. Zelenko has provided a priceless service to the world with his over-the-counter, all-in-one treatment and prevention of the virus. I haven't had a cold or the flu (nor Covid-19) since I began taking these capsules daily. Such a simple solution to all the needless worry, fear, and anxiety. Endless thanks to him and his team at the lab!!


Dr. Zelenko I sincerely appreciate what you have created. To put it in one pill makes it so easy for our family. Thank you for this product but thank you for your honesty you’re a good man Dr. Z


I’ve been taking Z-stack for a few months now. I’ve been around individuals who had Covid and have not gotten sick. Thank you Dr. Zelenko! God bless you! 🙏🏽🇺🇸

Zelenko Protocol

Frequently Asked Questions