Your all-in-one formula for immune system maintenance and support.

Z-Stack is one of Dr. Zelenko's premier products that he specifically designed which may support your body's natural immune system.

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

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 immune system and body's natural defenses when you need it most.

Explore the natural ingredients in Z-Stack

Vitamin C (click to expand)

Vitamin C has been shown to play a complex, protective role against toxic compounds formed from oxidized lipids and may support overall immune health.

Vitamin D3

Vitamin D has been shown to increase intestinal calcium and phosphate absorption.


Zinc is a nutrient found throughout your body that may support your immune system and metabolic function.


Quercetin may promote a healthy inflammatory response. This nutrient may help your body better absorb and utilize vital nutrients like Vitamin C.

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

The ingredients in Z-Stack – Vitamin C, D, Zinc and Quercetin – work synergestically to maximize absorption of each other and support healthy cellular activity.

Z-Stack Dr. Zelenko Vitamin Dietary Supplement Immune Support Supplements | Immune System Booster | Z-Stack®

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.

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Learn how Zinc Ionophores play a role in supporting your immune health

The Zelenko Way

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, vegetarian, and gluten-free.

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

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