Ingredients & E-Codes Gelatin is kosher only when it comes from a kosher source and carries a reliable hechsher. Most of the gelatin on supermarket shelves does not, because it usually starts with pork or non-kosher beef. The good news is that a label tells you most of what you need in a few seconds.
Is It Kosher? Marshmallows are kosher only when they carry a reliable hechsher, and many common brands do not. The reason is gelatin, which is usually made from animal sources that are not kosher. Certified marshmallows, fish-gelatin versions, and vegan options are the ways around it.