My old man used to swear by raw Onions against Colds and Flu and to be fair he was rarely ill. When I was young I never really like raw Onion, now if I want a snack it's often a Cheese and Onion sandwich. In fact at the moment I have a bit of a craze on them.
My ferreting mate has been coughing and spluttering all Autumn and still is. The Wife has had Covid since 23rd Dec and still testing positive but touch wood I have been right as rain. I take a Zinc and vitamin C all in one tablet also I have a Yakult probiotic which I take my blood pressure tables with (helps remind me to take the pi