Z-STACK
A Dr. Zelenko Vitamin
73/100
SUPPIE SCORE
62/100
EFFICACY
Medium
SAFETY
94/100
CLEANLINESS
What Does A Dr. Zelenko Vitamin Do?
Z-Stack combines vitamin C, D3, zinc picolinate and quercetin at doses inspired by Dr. Zelenko's protocol, with moderate evidence for immune cell support when deficiencies exist but limited RCTs on the exact blend for preventing illness.
How does the combination of quercetin and zinc in this formula work together?
What is the best way and time of day to take Z-Stack capsules?
Are there any dietary or medication interactions I should be aware of with these doses?
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What Are the Benefits of A Dr. Zelenko Vitamin?
Based on proven scientific research
Immune SupportModerate
Antioxidant ProtectionMild
Cellular HealthMild
Good For:
What Are the Side Effects of Z-STACK A Dr. Zelenko Vitamin?
Always consult your health practitioner if in doubt.
RiskMedium Risk
Overview
•Zinc at 30 mg exceeds the 40 mg UL when combined with dietary sources, risking nausea, copper depletion with long-term use.
•Vitamin D3 at 125 mcg (5000 IU) is high; monitor serum levels to avoid hypercalcemia risk with prolonged intake above 100 mcg daily.
•Quercetin dihydrate 500 mg generally well-tolerated but may interact with medications metabolized by CYP enzymes.
•Vitamin C at 800 mg is within safe limits but high doses can cause GI upset or increase kidney stone risk in susceptible individuals.
•Not recommended for pregnant or nursing women due to quercetin content; consult physician before use if on medications.
•Contains no common allergens but always verify for individual sensitivities.
Potential Side Effects
Negative Interactions
Inactive Ingredients
Vegetable capsule (hypromellose)
Low RiskMagnesium stearate
Low RiskMicrocrystalline cellulose
Low RiskSilicon dioxide
Low RiskWhat Are the Ingredients in Z-STACK A Dr. Zelenko Vitamin?
Vitamin C (as Ascorbic Acid)
800 mg
Vitamin D3 (as Cholecalciferol)
125 mcg
Zinc (as Zinc Picolinate)
30 mg
Quercetin Dihydrate 95% (as Sophora Japonica)
500 mg
Vegetable Capsule (hypromellose)
Magnesium Stearate
Microcrystalline Cellulose
Silicon Dioxide
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Dosage & Bioavailability
How the active doses and forms in A Dr. Zelenko Vitamin compare to the research.
•Vitamin D3 (as Cholecalciferol) — 125 mcg per serving; above typical 15-20 mcg maintenance but within studied 50-125 mcg daily ranges for adults.
•Zinc (as Zinc Picolinate) — 30 mg per serving; picolinate form shows higher absorption than oxide in some comparisons.
•Quercetin Dihydrate 95% (as Sophora Japonica) — 500 mg per serving; standardisation to 95% with moderate oral bioavailability.
Sources & References
Frequently Asked Questions
Common questions about Z-STACK A Dr. Zelenko Vitamin