Get a free sample of Emergen-C -- just in time for flu season -- when you share your name, address, e-mail, sex, and year of your birth. The freebie form also asks three questions about your use of Emergen-C. You can opt in or out of the company's e-mail newsletter.
It's unclear how long supplies of this freebie will last. You can request one free sample per e-mail address or check the status of an existing free sample request. If you have a free sample pending, you are not eligible to get this freebie (I tried).
Caveats: valid for residents of the U.S. and Canada only.
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Free sample of Emergen-C