Swype Shield, billed as physician-invented cold and flu prevention product, killed more than 99% of 25 cold and flu viruses in lab testing. The clear gel is applied on the nostrils, which is where cold and flu viruses most often enter the body.  The active ingredients in Swype Shield are non-toxic and safe to apply to the skin multiple times a day. Swype’s creator, Nuance Health, LLC, contends ingredients used can be found in other skin-cleaning products. “My experience as an immunologis...