Gelatin capsule shell: Mainly made of animal leather. There have been toxic capsule accidents before, so there are fewer people on the market now, so you need to buy them carefully;
Starch capsule shell: Mainly made of cassava starch. The main difference with gelatin is that you don't have to worry about poison capsule accidents, so it is relatively safe to eat.
You can look at the empty capsules of Erkang starch. I hope my answer is helpful to you.