Immune Support + Elderberry

Z-Flu Elderberry Gummies
Z-Stack® is one of Dr. Zelenko’s premier products that he specifically designed.

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-Flu has all the same ingredients you have come to love about Z-Stack plus Elderberry in a unique gummy delivery system.

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

The ingredients in each gummy of Z-Flu weren’t chosen at random – they were chosen specifically for their natural ability to help support the immune system and provide natural defenses when you need it most. With the added benefits of Elderberry this gummy specifically targets viruses and viral activity in the body.

Explore the natural ingredients in Z-Flu

Explore the natural ingredients in Z-Flu

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’s defenses against bacteria and viruses.
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.

Packed with antioxidants, provides a boost to the immune system, has been shown to ease cold and flu symptoms while decreasing systemic inflammation

Say goodbye to flu season with Zelenko’s Immune Boosting Gummy Formula.

Making sure your body takes in enough elemental zinc into the cells has always been at the forefront of Dr. Zelenko’s philosophy to boosting immune defenses.

Z-Flu provides foundational immune supporting ingredients but also adds Elderberry. We took it one step further by bringing you a pure extract at its highest concentration, delivering four times more bioavailability than the elderberry used in competing formulas.

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 detox for overall immunity.

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

To this day, the same team which built Z-Stack continues Dr. Zelenko’s legacy with uniquely-designed natural solutions to modern-day living, including Z-Shield.

The zelenko protocol

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Our products


Z-Shield™ | Detox Supplements -
Immunity Boost


Immune Support Vitamins - Your All-In-One Immune Boosting Super Formula


Sleep better knowing your
immune system is protected.



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

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