Developed by Dr. Zev Zelenko, Z-Stack combines the four most effective natural immune-support nutrients into one potent daily supplement. With Vitamin C, Vitamin D3, Zinc, and Quercetin, Z-Stack supports your body’s natural defenses and promotes cellular health, helping you stay resilient against common viruses. 

• Immune Defense: Zinc and Quercetin help protect against viral threats and support cellular function. 
• Complete Wellness: Vitamin D3 aids nutrient absorption, while Vitamin C enhances immune response. 
• Science-Backed: Formulated based on years of clinical research by Dr. Zelenko.