Honesty, pricing, process and quality scores appear once 5 customers have rated them.
About Z-STACK
Zelenko Labs, built on the legacy of Dr. Vladimir Zelenko, creates products with purpose, precision, and integrity. Every formulation is made with high-quality ingredients and consistent standards, so you can feel confident in what you’re using. Thoughtful, reliable, and principled — Zelenko Labs products are made for people who care about quality.Our All American customer service team is here to help Monday through Friday, 9 AM to 5 PM EST — just give us a call at 1-800-ZELENKO (1-800-935-3656) or email our team at [email protected]
Z-STACK (zstacklife.com) has 95 customer reviews on Folks Told, with an average rating of 4.1 out of 5.
I have been taking Z-stack ever since 2019. I am 68 years old and have not had to go to the doctor all this time. I know that this product has worked for me! It’s awesome! No sickness at all! All these years! 1 a day has kept the doctor away! 😊! Try this! You will not be disappointed!
Reply from Z-STACKSep 9, 2026
Thank you Beverly!
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Mary H.
Safety with Z-Stack
We have been taking Z-Stack since right after Covid. We had one mile case of covid a few years back, Otherwise, we have been very healthy. We feel much safer being out in public by taking our Z-Stack and have had no colds or other viruses for years.
Reply from Z-STACKSep 9, 2026
Thank you Mary!
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Linda R.
Z-STACK will help me usher in my 79th Birthday
I started taking Z-STACK during Covid and since then I have had a light case of Covid and last year a bout with bacterial pneumonia. But overall I am quite healthy and strong and enjoy every day looking forward to my 79th birthday very soon. I credit my good health to the good genes passed to me by family and my commitment to taking Z-STACK everyday with breakfast.
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Mark M.
I had missed the 20% discount time by…
I had missed the 20% discount time by about 1/2 hr. because I'm on Central time and I didn't realize the sale was on Eastern Time. Yes, I had procrastinated. Anyway I had the products at checkout and then left when the discount wouldn't go through. Z-STACK emailed me about it. I emailed them back to tell why I abandoned the purchase. They said tell us the products you want & we will honor the discount. And so I did. Thank you Z-STACK. I've been taking their products for a few yrs. and have not been sick. Even when I would feel something coming on I would double-up on Z-STACK and it would go away.
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Sue
This product is outstanding
This product is outstanding! If you are feeling like your even catching a cold or don't feel well z stack will truly help. A wonderful combination of vitamins. Highly recommend! This was very helpful for covid at that point in time so now I always keep the supplement on hand.
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Bo
It's a just a great product
It's a just a great product. I've turned other on to Z-Stack and they love it. But they use Z- Stack differently. They start taking it when they start to feel something coming on. And most tell me whatever they had doesn't last long. I on the other had take 1 capsule every morning. I call it my body preventive maintenance. Like what you do with your car. And I can say, I have never been more healthy.
Reply from Z-STACKAug 27, 2026
Thank you Bo!
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Janice
I buy this for my son who was getting…
I buy this for my son who was getting sick a lot. Hasn't been sick since he started on these. GREAT PRODUCT and wonderful people to deal with.
Reply from Z-STACKAug 27, 2026
Thankyou Janice!
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Bill G.
Absolutely Excellent !!
Although the last date of my Uplifting experience with the Z-Stack team, and in this case Shannon, and their products was today, it's simply a repeat of many I've had with their team since Z-Stack's inception during COVID times approximately 6 years ago. Today, I made a personal error in ordering another regular 6 month (6 bottle) supply of Z-Stack after placing the same order yesterday but missing the fact that they'd already promptly notified me confirming the order yesterday. I contacted their support staff and within a few minutes received a response that today's order in question had already just been cancelled and charge card refunded. Over the approx. 6 years I've made about a dozen 6 bottle orders and although ordering is a breeze and shipping is seamless, I've found ways on a few occasions to make a simple technical ordering error but each time they've been met swiftly and with personal care. If everyone strived to serve others as the Z-STACK family does, who proudly carry the Legacy of Dr. "Zev" Zelenko, this world would be a far better place. Dr. Zev proved so much of what he stood for when he initially offered Z-Stack during dangerous times specifically when speaking out for better means of good health & immunity seriously risked losing his reputation and so much more. May he Rest in Peace. On the selfish side of things, I'm now a 69 year old male, average build & weight, moderate to low exercise, random but fair eating habits & non smoker or alcohol drinker. I've continuously been in contact with the public, shaken many hands & hugged or kissed lots of people & grandkids. Having said all of that, I chose not to touch any Pharmaceuticals or mask up over the past 6 years and am a chronic anti-vaxxer. I haven't had as much as a runny nose, cough, sniffle, sore throat, ear ache or anything else you can think of, over the past 6 years with Z-Stack. Seriously. I'll always be an Ambassador for the Z-Stack Family and Products.