Store › Antiviral Formula B Antiviral Formula B $10.00 sold out An antiviral blend of Lemon Balm, Echinacea angustifolia root, Astragalus root, Rosehips, and Boneset. Sold Out Added! An antiviral blend of Lemon Balm, Echinacea angustifolia root, Astragalus root, Rosehips, and Boneset.