For instance a mixture of myrrh, green tea, pau d' arco, olive leaf, algae, amla, and poke root. The myrrh is a hyaluronidase inhibitor so it prevents viruses from spreading. It is also directly antiviral and contains immune stimulating polysaccharides.
Green tea contains antiviral polyphenols.
Pau d' arco contains 18 antiviral anthraquinones and napthaquiniones. Olive leaves contain protease inhibitors which basically inactivate viruses. Algaes contain immmune stimulating polysaccharides, and nutrients to support the immune system through the adrenal glands and thymus gland. Amla raises the levels of superoxide dismutase which in turn raises peroxide levels, in response to interferon production triggered by viruses, which stimulates white blood cell activity. Poke root contains a protein called PAP which is structurally similar to interferon, which is a great antiviral.