Zicam? Ziscam!
The bastards at Zicam have a product that can actually make you lose your sense of smell. Permanently!
It turns out they kept over 800 complaints of loss of smell secret and did not inform the FDA as they are required to do.
The active ingredient, Zinc, has been shown to maybe shorten colds, if taken at the very onset of colds. This is apparently a pretty tenuous link to begin with. Any risk of such a serious side effect in an attempt to alleviate a self limiting disease (a cold) is absolutely not worth it, and does not pass the FDAs muster for safety.
The FDA has issued a warning, and with any luck will put those asses out of business for damaging people needlessly.
Zicam has removed the nasal products from the market, but are keeping 17 other versions on the market. Check their official website: http://www.zicam.com/.
Read more here: http://www.sciencebasedmedicine.org/?s=zicam