An Interesting Article:
Most Vitamins Are Useless, Here Are The Ones You Should Take
I read the second article you linked to, and I have to disagree with the advice on probiotics - I’ve found them very beneficial - but agree with the Zinc advice. Any colds or ‘flu that we’ve gotten in recent years have been very mild and short, using Zinc.
We also use Vit. C for colds and flu.
-JT