I take 500 mg Vitamin C and it never progresses beyond a sniffle.
The Echinacea and zinc in natural remedies like Zicam in combination with 500-1000 mg of Vita C works great, too-I’m one of those who believes we humans have overused drugs, hand sanitizers, allergy remedies, etc to the point that germs are resistant and our immune systems weakened. I’m glad I have stayed away from the drugs, including OTC allergy remedies-I do keep hand sanitizer in the console of my vehicle-there are sometimes icky things on jobsites that son’t need to leave with you...