Been pretty sick the last few days and have been slamming one or two of these everyday. Maybe its just one of those 'its comforting to have something you are able to do about this situation things' which I am fine with but it would also be nice if it had a real effect.
there's some literature to support taking "mega" doses of vitC reduces the severity/duration of "colds". by mega, i mean 1 gram or 1,000-2,000 mg.
for reference, Recommended Daily Allowance is 75 mg for women and 90 mg for men (probably average weight based).
i've mostly seen those packets and similarly dissolved in water/big doses recommended by nurses, but it was also brought up in my human nutrition class and endorsed. they are pretty cheap, they don't taste bad, and the body pisses out all the excess vitamin C so the chances of toxicty are negligible. i use them when i feel something coming on.