Z-Stack®
Purchase Options: Subscribe | One-time
Autoship, first order only
- Save over $50 on your first bottle, then $45.10 monthly
- Choose a free gift that ships with your first full-price order
- Cancel anytime. No commitment.
Buy once
- One bottle, a 30-day supply. No subscription
Z-Stack® is perfect for people who:
✔ Want daily immune support
✔ Travel frequently
✔ Work around children or the public
✔ Have demanding or busy lifestyles
✔ Take a proactive approach to their wellness
Z-Stack® is Dr. Zelenko’s original formulation and the foundation of the Zelenko Protocol. Drawing on decades of experience as a board-certified family physician, he developed Z-Stack® from real-world clinical insight to support the body’s natural immune defenses.
Carefully crafted with physician-guided expertise, Z-Stack® features targeted, clinically dosed ingredients designed to help maintain a strong, balanced immune system – continuing Dr. Zelenko’s mission of practical, science-based wellness support.
As a dietary supplement, adults take two (2) capsules daily or as directed by a healthcare provider.
Warning:
Z-Stack® contains quercetin and should not be used if you are pregnant or nursing.
Vitamin C (as Ascorbic Acid) 800mg, Vitamin D3 (as Cholecalciferol) 125 mcg, Zinc (as Zinc Picolinate) 30 mg, Quercetin Dihydrate 95% (as Sophora Japonica) 500 mg
Subscribing means more than convenience — it’s the smarter way to save while staying consistent with your wellness routine.
As a subscriber, you’re automatically enrolled in the Zelenko Subscriber Rewards Program! Enjoy $4.95 for your first full-month supply, then save 18% on recurring orders at just $45.10 per month. Plus, earn 10% back in store credits after every second eligible subscription order, unlock referral rewards, enjoy surprise milestone gifts, and choose a free gift with your first full-price order.
With convenient automatic deliveries and the flexibility to skip, pause, or cancel anytime, you can enjoy more value with every order.
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 has been shown to increase intestinal calcium and phosphate absorption, helping maintain strong bones.
Quercetin supports a healthy inflammatory response and functions as a zinc ionophore, helping shuttle zinc into cells so your body can better absorb and utilize it.
Zinc is a nutrient found throughout your body that may support your immune system and metabolic function.
Z-Stack® vs the Alternative
High-end quality, fewer pills, and better value. Z-Stack® combines multiple essential supplements into a single, clinically dosed, and convenient formula.
Builds Strong, Daily Immune Defense
Promotes a Balanced Immune Response
Delivers Nutrients Where It Matters
Doctor-Formulated & Clinically Dosed
VITAMIN C
$15 - $25
QUERCITEN
$25 - $45
VITAMIN D3
$15 - $30
ZINC
$15 - $25
TOTAL (USD):
$55
$70 - $125
"I have been taking Z-Stack for a long time. I know I can trust the ingredients. Thank you!"
"I am not a medical lab technician. I take several different items I have chosen to use in order to maintain my health. I literally cannot tell you what each one is specifically doing for me inside my body. I can say that since I have been using Z-Stack, and others, I have been very healthy on a constant basis. Thank you."
“We take Z-Stack daily and it helps us to keep healthy especially during this time of year. The Z-Stack Original has all the basic ingredients to help the immune system in the right proportion. It simplifies our lifestyle so instead of taking 4 to 5 other pills in combinations we only take 2 a day.”
