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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-Night was developed with real, all-natural ingredients.
The ingredients in each capsule of Z-Night weren't chosen at random – they were chosen specifically for their natural ability to help support more restful sleep without nasty side effects or harmful pharmaceuticals.
Explore the natural ingredients in Z-Night
Tryptophan (click to expand)
This essential amino acid – famous for inducing post-Thanksgiving drowsiness – serves as a precursor to melatonin. It has been shown to play a crucial role in regulating both mood and sleep, supporting a more peaceful slumber.
GABA
With its unique properties, GABA may actively reduce the time it takes to fall asleep. By calming your body's nerve responses to the brain, GABA may help support a state of relaxation, allowing your mind to disconnect and unwind.
Magneium
As an essential mineral, magnesium may help boost melatonin levels, which may improve the quality and duration of your precious sleep.
Rutaecarpine
This remarkable natural compound may boost the breakdown and excretion of caffeine, supporting an efficient detoxification process.
Chamomile
Embrace the soothing effects of chamomile – the gentle flower often known for its presence in many "sleepy-time" teas. Acting as a natural sedative, chamomile aids in relaxation which may lead to improved quality and length of sleep.
Hops
Hops may be considered a natural sedative that may help you achieve a longer and more restful sleep.
Passion Flower
Passion Flower is known for its calming effects and may help promote restful sleep.
Valerian Root
Valerian Root may ease restlessness which may help reduce the amount of time it takes to fall asleep.
Experience the secret to a night of blissful rest. Say goodbye to sleepless nights and embrace a rejuvenating slumber that leaves you refreshed and ready to conquer each day with vitality and vigor.
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.