Honestly, I don't get the hype over this product.
Emergen-C doesn't work
Yes, Vitamin C is great for the body. Yes, Vitamin C boosts the immune system. Yes, Vitamin C can even cure allergies.
Emergen-C sucks Emergen-C sucks Emergen-C doesn't work
But drinking one gram of Vitamin C is little more than taking a spoonful of sugar. First of all, one gram of Vitamin C is hardly enough to do anything. Most of us are malnourished when it comes to Vitamin C anyway, because we're chronically Vitamin-C deprived, such that we really need at least 2-3 grams per day...even when we're healthy. (See here as to why we need far beyond the National Academy of Science's recommended dosage of 60 mg)
Second, I'm sure it tastes great and all when you're sick - but there's hardly any health benefit! It's much more cost-effective AND health-effective to get a bottle of chewable Vitamin C 500 mg tablets and munch on those all day.
In fact, even the company has no faith in their product. Their website says:
These products are not intended to diagnose, treat, cure, or prevent any disease.
Not intended to treat? I can understand not intended to diagnose, cure, or prevent - but not intended to treat? Then why the heck am I using this product for?
Bottom-line: This product's more of a marketing ploy than a useful product. But if you're really intent on trying some for free, they're doing a special "free samples" program right now where you can get a packet through the mail.