I have noticed, since dropping grains and dairy from my diet two years ago, that any respiratory illness I get is less severe - I'll feel like I'm coming down with something occassionally, but it never really takes hold, and I don't get congested. This was before I started taking any supplements.

Dairy, with it's mucogenic reputation, is the obvious culprit, but I've avoided dairy in the past without this much benefit. I do think the grains (especilly wheat?) make a real difference.

Also taking D3, C, b-complex, zinc, and a multivit, dosage varying depending on my needs. And I'm chewing a clove of garic a day. Yum :-)

Something is working, as I've had no more than an occassional throat tickle despite getting the flu shot.

(Edit: not drunk, just phone-posting..)