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Z-STACK® bottle with fresh oranges, sophora japonica blossoms and zinc powder

Dr. Zelenko's Original Formulation

Z-STACK®

Daily Immune
System Support*

Targeted. Clinically Dosed.
Built for Strong, Balanced
Immune Support.

  • Daily Immune
    Support*
  • Balanced Immune
    Response*
  • Doctor-
    Formulated
  • Clinically
    Dosed
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  • Made in
    USA
  • GMP
    Certified
  • Third-Party
    Tested

Daily Immune
Support*

Supports the body's
natural defenses.*

Balanced Immune
Response*

Helps maintain a healthy
immune balance.*

Doctor-Formulated

Created by physician
expertise you can trust.

Clinically Dosed

Targeted ingredient
levels that matter.

Convenient
All-in-One Formula

Four powerful ingredients
in one daily capsule.

Powerful Ingredients. Purposeful Doses.

Fresh oranges, a source of vitamin C

Vitamin C

800 mg

Supports overall
immune health.*

Sunlight through a forest, evoking vitamin D3

Vitamin D3

125 mcg

Helps maintain strong
bones and immune support.*

Raw zinc mineral crystals

Zinc

(as Zinc Picolinate)

30 mg

May support immune system
and metabolic function.*

Sophora japonica blossoms, a source of quercetin

Quercetin Dihydrate 95%

(as Sophora Japonica)

500 mg

Supports a healthy inflammatory
response and helps shuttle zinc
into cells.*

Why Z-Stack®?

  • 4 Key Ingredients in 1 Capsule
  • Clinically Dosed for Results
  • Physician-Formulated
  • Quality You Can Trust
Z-STACK®
Typical Immune
Supplements

One Capsule.
Daily Support.
Powerful Results.

Trusted by Thousands

"Z-Stack has become a daily essential in my routine. I feel more resilient and stay healthier year-round."
– Michael T.
"I love that it's doctor-formulated with the right doses of key ingredients. Simple, effective, and convenient."
– Sarah K.
"High-quality ingredients and one easy capsule a day. Peace of mind for my whole family."
– David R.
Z-STACK® 60 vegetarian capsules bottle

Support Your Immune System
With Z-Stack®

Doctor-Formulated. Clinically Dosed.
Built for Daily Immune Support.*

Order Z-Stack® Now
  • 60-Day
    Money-Back
    Guarantee
  • Secure
    SSL Encrypted
    Checkout
  • Satisfaction
    Guaranteed
  • Made in
    the USA
Portrait of Dr. Vladimir Zelenko

The Legacy of Dr. Zelenko

Z-Stack® was developed by Dr. Vladimir Zelenko, a board-certified family physician, to support the body's natural immune defenses with a targeted combination of clinically studied nutrients.

Physician expertise. Original formulation. Trusted worldwide.