• A bottle of Z-Stack Plus Elderberry dietary supplement with three strawberry gummies in front
  • A dark amber supplement bottle with a black ribbed cap, showing the back label with a purple background and white text. The label reads 'SUPPLEMENT FACTS' and includes product details
  • Z-Flu Ingredients on elderberry branch background
  • A bottle of Z-Stack Plus Elderberry dietary supplement gummies on a dark purple background, with three gummies displayed in front and marketing text on the right.
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  • A comparison infographic titled 'See How We Stack Up' showing a table comparing the Z-STACK plus Elderberry supplement bundle to individual supplements like Vitamin C, Quercetin, Vitamin D3, Zinc, and Elderberry, with green checkmarks and pricing ranges on a light gray background.
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  • A supplement facts label on a dark purple background, showing nutrition information for gummies including calories, total carbohydrate, sugars, added sugars, vitamins, zinc, sodium, European Elderberry Fruit, quercetin, and other ingredients. Five certification logos appear along the bottom.
Immunity Support

Z-Stack® Plus Elderberry Gummies

Z-Flu™ is becoming Z-Stack® Plus Elderberry.
Same formula, same gummy – new name.

(102)

Purchase Options: Subscribe | One-time

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Flexible. Rewarding. Commitment-Free.

$55.00 $55.00

One-Time Purchase

$55.00

AS LOW AS $1.50/DAY + FREE U.S. SHIPPING 🇺🇸

Z-Stack® plus Elderberry is perfect for people who:

✔ Want recovery & immune support during seasonal challenges
✔ Spend time around schools, workplaces, or crowded environments
✔ Like to keep immune support on hand when they need it
✔ Prefer an easy-to-take gummy formula
✔ Want targeted support alongside their daily wellness routine

Boost your immune system with Z-Stack® plus Elderberry, an all-natural, doctor-formulated gummy supplement created by Dr. Zelenko. Clinically dosed to support your body’s natural defenses year-round, Z-Stack® plus Elderberry delivers a powerful blend of essential vitamins and nutrients to help maintain immune function and overall wellness.

Whether you’re looking to strengthen your daily immune support or stay prepared during seasonal challenges, Z-Stack® plus Elderberry provides targeted nutritional support to help you stay healthy and resilient year-round.

As a dietary supplement, ages 4-8 take one (1) gummy daily with food and ages 9+ take two (2) gummies daily with food or as directed by a healthcare provider.

For 4-8 years of age:
Vitamin C (as ascorbic acid) 100 mg, Vitamin D3 (as Cholecalciferol) 2000 IU, Zinc (as Zinc Gluconate) 3 mg, European Elderberry Fruit Extract 65:1 (Saumbucus Nigra) 30 mg, Quercetin 50 mg

For 9+ years of age:
Vitamin C (as ascorbic acid) 200 mg, Vitamin D3 (as Cholecalciferol) 4000 IU, Zinc (as Zinc Gluconate) 6 mg, European Elderberry Fruit Extract 65:1 (Saumbucus Nigra) 60 mg, Quercetin 100 mg

Subscribing means more than convenience – it’s the smartest way to save while staying consistent with your wellness routine.

As a subscriber, you’re automatically enrolled in the Zelenko Subscriber Rewards Program. You can enjoy 10% back in store credits, referral rewards, surprise milestone gifts, exclusive subscriber pricing, convenient automatic deliveries, and more!

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Z-Stack® plus Elderberry Key Ingredients

The carefully selected ingredients in Z-Stack® plus Elderberry – Vitamin C, Vitamin D3, Zinc, Quercetin and bio-available Elderberry – work in harmony to enhance each other’s absorption, promoting optimal immune support and healthy cellular function.

Vitamin C 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.

Elderberry is packed with antioxidants and may support a healthy immune system.
The raw ingredients in Z-Flu The raw ingredients in Z-Flu
The raw ingredients in Z-Flu

Vitamin C has been shown to play a complex, protective role against toxic compounds formed from oxidized lipids and may support overall immune health.

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.

Vitamin D3 has been shown to increase intestinal calcium and phosphate absorption, helping maintain strong bones.

Zinc is a nutrient found throughout your body that may support your immune system and metabolic function.

Elderberry is packed with antioxidants and may support a healthy immune system.
Z-Stack with Elderberry Recovery Support supplement shown as an open dark bottle with pink elderberry gummies spilling out on a purple background, with product text and three benefit icons below. Z-Stack with Elderberry Recovery Support supplement shown as an open dark bottle with pink elderberry gummies spilling out on a purple background, with product text and three benefit icons below.

Z-Stack® plus Elderberry vs the Alternative

High-end quality, fewer pills, and better value. Z-Stack® plus Elderberry combines multiple essential supplements into a single, clinically dosed, and convenient formula.

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Supports Strong, Daily Immune Defense

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Promotes a Balanced Immune Response

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Helps Your Body Defend Against Seasonal Threats

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Doctor-Formulated & Clinically Dosed

Z-Stack Plus Elderberry dietary supplement bottle, strawberry flavor
Two white pill bottles on a white background

VITAMIN C

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$15 - $25

QUERCITEN

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$25 - $45

VITAMIN D3

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$15 - $30

ZINC

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$15 - $25

ELDERBERRY

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$15 - $28

TOTAL (USD):

$55

$85 - $153

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Zelenko Subscriber Rewards

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Subscribe to your favorite products and enjoy automatic deliveries, exclusive subscriber savings, 10% back in store credits, and more!

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Questions Customers Ask Most

Z-Stack® plus Elderberry is a physician-formulated immune support supplement developed by Dr. Vladimir Zelenko. While Z-Stack® is designed for daily immune maintenance, Z-Stack® plus Elderberry is a more targeted formula for periods of increased immune demand, such as travel or colder months.

Z-Stack® plus Elderberry is often taken during times of increased immune demand, such as travel or colder months. It can also be used proactively when you want extra immune support beyond your daily routine, including during recovery as you get back to feeling your best.

Z-Stack® plus Elderberry combines a physician-formulated approach with key immune-supporting nutrients and elderberry, a fruit extract rich in antioxidant polyphenols. Its gummy format also makes it convenient and easy to take compared to capsules or tablets.

Z-Stack® plus Elderberry is designed for adults and children ages 4 and up who want targeted immune support during seasonal challenges. It’s especially helpful during periods of increased stress, travel, or exposure, when maintaining strong immune resilience is important.

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Trusted Wellness, Real Feedback

"I love this product. I buy it for my granddaughter and myself and have taken it for a long time; more than two years. I highly recommend it, but it sells fast and is frequently on back order, so I subscribe to it."

Rosa G. 🇺🇸

"Had a great winter & spring rotating Z-Flu on even days & Z-Stack on odd days."

Marilyn H. 🇺🇸

"Not gigantic pills, that are hard to swallow, but delicious tasty chewables that are good for me! Praise God! God bless the Zelenko family!"

Deb D. 🇺🇸