01 - Pour the fruit juice into a small saucepan. Sprinkle the gelatin evenly over the surface and let it sit for 2 to 3 minutes to bloom.
02 - Set the saucepan over low heat and stir constantly until the gelatin dissolves completely. Do not allow the mixture to boil.
03 - Remove from heat. Stir in the collagen peptides and sweetener if using, mixing thoroughly until fully combined.
04 - Transfer the mixture into silicone molds or a small baking dish lined with parchment paper.
05 - Refrigerate for at least 2 hours or until the jellies are completely firm.
06 - Remove the jellies from the molds. If using a baking dish, cut into bite-sized pieces with a paring knife.
07 - Keep the jellies in an airtight container in the refrigerator for up to 1 week.