I imagine it could eventually lead to a full invisibility serum, as documented in the classic Kevin Bacon film Hollow Man. Of course, we need to be aware of the side effects (mostly murderous rampaging).
You forgot blindness. If you're transparent, your eyes won't be able to refract light. Which is good if you also have homicidal urges, but awful if you get diarrhea.
(This might be the more desirable of the two outcomes. Otherwise you the man may be invisible, but everyone sees your intestinal contents floating in mid-air.)
