Zinc, L-lysine which destroys the virus lipid coating, Vitamin C, there are a host of herbals that help. Grapefruit Seed Extract, (GSE), which is an herbal for respiratory problems, anti-biotic for the lungs obviously. Garlic, selenium, HBT, which also destroys the lipid coating. Turmeric, gingko, ginseng, ginger which all support the immune system.
For a twenty year old, I do not look a day over 74. :-P
Gunner
Stay safe, stay well,