Z-STACK Avis 

Zalanko Labs has excellent products and customer service. I really appreciate the wya they handle orders promptly and efficiently and get back to me immediately.

Disappointed that the order default is automatically on SUBSCRIPTION. You have to OPT into a 1 time order. Feels deceptive and only way to correct it is by contacting the co. You can't correct online.

My husband and I have taken Z-Stack since the beginning of covid. Neither of us ever contracted covid nor have either of us have had a cold since beginning Z-Stack.

The support team answered and resolved my query very quickly. They were caring in their words when answering and I felt valued as their customer. Thank you support.

I have been using Z Labs products since covid. I'm hardly ever ill. My husband and I started with Z Stack and he takes it every day. I use Z Flu gummies, Z Calm and Z Night. I highly recommend them for good health!

Zstack has the best products and customer service! Prompt reply’s, and kind folks behind the messages. I’ve been using Zstack for a handful of years now and I’m so impressed by the innovation of their products and the quality ingredients! Highly recommend!!

I have been a faithful Zelenko Labs customer and subscription customer for approximately two years. I believe in the products, and I have intentionally continued supporting this company because of my respect for Dr. Vladimir Zelenko, his story, his legacy, and what the company represents.

Unfortunately, my recent experience with customer service—specifically with a supervisor—was extremely disappointing.

I called because I had a simple question about my subscription pricing. The amount appeared higher than I expected, and I wanted to understand and confirm the rate. Instead of being able to have a straightforward customer-service conversation, I found the supervisor unusually defensive and sensitive to my questions.

What concerns me most is what happened afterward. My subscription order was scheduled to process on September 18. The payment method shown on my account had not expired or changed. Yet following my conversation with the supervisor, my order did not process. My account first displayed a payment-method error and then stated that there was trouble with my account and directed me to contact support.

Given the timing and what occurred during the call, I was left with the strong impression that something was done to my account that interfered with the processing of my scheduled shipment. If that is not what happened, I would welcome Zelenko Labs reviewing the account history and explaining exactly what caused it.

This is particularly troubling because I was not calling to cancel, complain about the products, or create a problem. I am a long-standing customer simply asking a question about what I was being charged. A customer should be able to question a price or ask for clarification without feeling that the relationship—or an upcoming order—could somehow be affected.

I continue to have great respect for Dr. Zelenko’s legacy and have been very pleased with the products themselves. My concern is with the customer-service culture I experienced. Questions from loyal customers should be welcomed, not taken personally. And supervisors, especially, should model professionalism, emotional maturity, transparency, and respect.

I hope leadership takes this seriously, reviews what occurred with my account, and ensures that customers can ask reasonable questions without experiencing this kind of response.

I have been a customer for several years. Their customer service is always timely and I'm never disappointed in their effort to accommodate my needs. Great company!!!!

I have been a satisfied customer for years and I'm impressed with the products as well as the customer service. I take the Z-Detox which offers a great combination on ingredients, which I would otherwise be taking separately. I had great respect for Dr. Zelenko and I'm grateful that the company has carried on since he passed away.

Fantastic product! Use the Z-Stack and Z-Night everyday. Will not go without them. Been using both products currently. Started Z-Stack went it first came out and added the Z-Night when they created the bundle buy option.

ZStack has made me feel more awake in the mornings and has kept me from getting sick. I've been using ZStack for 3 years and I love it!!! Thank you Dr. Z!!

I am a new subscriber. I saw this product and I had watched Dr. Zelenko on a few podcasts. At the time I could not afford the product but I did not forget the results of using the product and the quality of the product and wanted to see the results.

I began taking my Zstack soon after Covid began. I am 77 and healthy but would get the yearly flu and occasional colds. Since starting my Zstack, I have not been sick with anything. My doctor is amazed and I shared the reason why....my Zstack.
Thank YOU for this wonderful totally effective supplement!!!

I will be starting my 3rd bottle of Z-Stack. Previously I had used another company's Quercetin product. Changed over to Z-Stack because of the additional additives of Vit. C, D3 and Zinc. I work in a restaurant and love the protection in gives me. Highly recommend.

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!

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.

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.

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.

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.

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.