What are the differences between Zicam and zinc supplements in terms of effectiveness and safety for treating cold symptoms?

Zicam is a specific brand of zinc-based cold remedy that is taken nasally, while zinc supplements are taken orally. Zicam has been associated with reports of loss of smell, while zinc supplements may cause stomach upset if taken in high doses. Both may help reduce the duration and severity of cold symptoms, but more research is needed to determine their overall effectiveness and safety.