We have two issues here:
1- The issue of gelatin: If you know that it is animal gelatin, it is not permissible to eat it. But if it is possible that it is vegetarian, then it is permissible to eat it, and it is not necessary to search and investigate.
2- The issue of Omega 3: It is not permissible for you to consume the substance unless you are certain that it was taken from fish with scales. If you do not know, then it is not permissible to consume it.