In addition to animal skin products in the broader sense of gelatin, there are other seaweed, kelp, agar, of sorts, most others are not. Some all-vegetarian gelatin substitutes are: guar gum and carrageenan. Only some emulsifiers are vegan. Agar is found in supermarkets in my country. In Shandong, there is donkey skin glue (halal glue) made by imams after slaughter, specialized in medicine, very expensive and rare.

Gelatin in the narrow sense, no halal. Buy when to ask clearly.