EZC Pak is an award-winningphysician formulated 5-Day tapered immune support pack designed to reduce inappropriate antibiotic use. EZC Pak is composed of certified organic Echinacea purpurea, zinc, and vitamin C to nutritionally support your immune system. When you're on the go or ...EZC Pak is an award-winningphysician formulated 5-Day tapered immune support pack designed to reduce inappropriate antibiotic use.