[quote="xrodolfox"]I used to not get sick.
Then I got kids. Holy crap. Then again, I've never been good at germ-free hygiene. Either way, I'd wager that 70% of the illnesses I've had in the last 10yrs have been since I've had kids.
HA! Tell me about it. Kids are like little virus generators. Add to that a new country, we moved to Austria from the States 5 years ago, and we get to experience a full range of strains we've never encountered nor built immunity against. We get sick a lot more now than we ever did before.
To your question, my wife and I used to take all sorts of things to boost our immune system. Echinacea, vitamin C, vitamin D, Goldenseal, homeopathic this and that, assorted teas, you name it, we tried it. Then we stopped. Absolutely no difference in frequency or length or severity of being sick. We don't bother anymore. I say save your money, get plenty of sleep, and wash your hands a lot.