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

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 defensed when you need it most.

Explore the natural ingredients in Z-Stack

Vitamin C (click to expand)

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

Vitamin D3

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.

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 be a wonderful preventative as well as a treatment for illness.

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, vegan, and gluten-free.

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

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