Most people only think about supporting their immune system during the cold weather months. But your immune system doesn’t only work in the winter; it’s busy and active all the time, especially these days. John Troup, PhD, Chief Science and Regulatory Officer for Vital Nutrients details four immune support products that stand out for their superior qualities, bioavailability, and effectiveness: ALLER-C®, ViraCon, NAC (N-Acetyl-Cysteine), and Quercetin. They're effective preventatively and during times of increased oxidative stress. Click HERE for part 2.