The [main] question is not whether gelcaps are “kosher”. Mainstream normative halacha tends to be cautious and not rely on the gedolim who paskened that gelatin is mutar lechatchila.
The main question is regarding to what extent taking pills is “eating.”
Kashrus organizations are beautiful things. Their existence enable many yidden to keep kosher easily, and offers many yidden a good parnassah. Their recommendations, particularly regarding eating food, are important.
Halacha (to the best of my knowledge) says that taking pills is not “eating food.” If you have knowledge otherwise either of: a. a long-accepted halachik practice (ie binding authority); or, b. a persuasive argument made by someone you respect (persuasive authority), you can cite the source and we can discuss whether the source is instructive to us.
My assumption of muttar gammur is based on my learning, mesorah, and general knowledge. I call it an assumption, because halacha is very fact specific. The assumption is that the facts apply to my knowledge of halacha.
I am not paskening for anyone here. Everyone should ask a competent rabbi if nonvitamin pills need to be kosher.
If you dont have a rabbi you can look at kashrus websites, blogs, coffeerooms, and/or google or (lehavdil) sefarim until you are definitively convinced one way or another. But you should probably get a rabbi so that the research is his responsibility. Also, he is probably better at it than you are.
A gutten kvittel to all…