Insulin and the shining silver papaer covering sweets are derived from animals.
Insulin used to be obtained from pig and cows long ago. Now it is all made via genetic engineering. No more animal source for that. Likewise the enzyme used in cheese making was produced from calf stomach (after slaughtering for veal). But that is also made via genetic engineering nowadays. I don't know the method for shining silver (animal fat?). If that is the case substitute can be found. There are always excuses for using it saying the animal is not slaughtered specifically for shining silver. But it is sourced from animal. For some it may be objectionable.