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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
Zinc is a nutrient found throughout your body that may support your immune system and metabolic function.
Quercetin
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-Shield was developed with real, all-natural ingredients.
The ingredients in each capsule of Z-Shield weren't chosen at random – they were chosen specifically for their natural abilities which may support your body's natural detoxification process without nasty side effects or harmful pharmaceuticals.
Explore the natural ingredients in Z-Shield
Vitamin D3
Vitamin D has been shown to increase intestinal calcium and phosphate absorption.
Zinc
Zinc is a nutrient found throughout your body that may support your immune system and metabolic function.
Lemon Balm
Lemon Balm may help support detoxification.
St. John's Wort (click to expand)
Studies have shown St. John's Wort may have anti-viral properties. It may also promote the release of serotonin and noradrenaline for a healthy mind and body.
NAC
NAC (N-Acetyl Cysteine) has been shown to help support removing environmental toxins from the body. NAC bonds with glutamine and glycine to form glutathione, a powerful antioxidant. Glutathione performs many functions throughout your body, such as helping to maintain your immune system and aids in maintaining cellular health.
EGCG
EGCG (Epigallocatechin gallate) has been to shown to support the immune system against environmental threats.
Turmeric
Turmeric has been shown to have anti-inflammatory properties, and may support liver health.
Zev continued his research into the body's immune system and elements that suppress the response mechanism to heal and defend. While the immune system gets rid of most viruses, some linger inside us for prolonged periods, hiding quietly without causing symptoms.
Our team developed the Z-Shield formula to help maintain the immune system and may assist in detoxing our bodies from harmful elements.
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-Sleep was formulated to be safe, healthy, and taken by people from all walks of life.