Tammy
Customer service was very responsive…
Customer service was very responsive and helpful
Response from Z-STACKAug 4, 2026
Thank you!

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 Five Star Index, with an average rating of 4.1 out of 5.
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Personal Care · Orlando, Florida
Excellent

Personal Care · Grants Pass, Oregon
Excellent

Personal Care · Great Neck, NY
Excellent

Personal Care · Costa Mesa, California
Excellent
Showing 71 reviews with 5 stars · Clear filters
Tammy
Customer service was very responsive and helpful
Response from Z-STACKAug 4, 2026
Thank you!
Marian De La V.
I receive Z-DTOX and Z-STACK from you for over 2 years. The products are great.They have helped to keep me healthy. When ever I have a question your staff is easy to reach and knowledgeable regarding your products. So thankful to have found your products. Marian
Response from Z-STACKAug 2, 2026
Thank you!
Mary Melissa H.
The Kids Z-Stack vitamins are literally the best kids’ vitamins out there, and we’ve tried plenty! If you want to keep your kids healthy, these vitamins really work! My three children have been taking them for about three years now. I get the subscription, and it’s worth every penny. Each of my children had a minor cold maybe twice within the entire last school year. I’m talking two to three days of sniffles, nothing major that even required a doctor’s visit. My oldest son had seasonal allergies for years, but not anymore. We virtually never get sick anymore. Praise God!!! Thank you, Dr. Zelenko! Also, the mixed berry flavor is awesome! My kids love it and say it tastes like Skittles!
Response from Z-STACKJul 27, 2026
Thank you Mary!
Wendy
Excellent customer service! Grateful for the help and problem solving!
Response from Z-STACKJul 22, 2026
Thank you Wendy!
Stacy B.
The zsleeep really makes a difference in my sleep!!! They are very responsive and helful
Response from Z-STACKJul 20, 2026
Thank you Stacy!
Jeanie S.
i like ordering these supplements they help me
Response from Z-STACKJul 14, 2026
Thank you!
Lawrence G.
The customer service is very responsive. I have used the Zelenko products for years now and they really helped me with my health issues.
Angie
I love my Z-Stack!! This month my package arrived opened and empty! I reached out and within a short while a replacement order was on the way! Thank you for your unmatched customer service!