A method for producing a peritoneal dialysate, an ophthalmic composition, or an infusion for intra-injection administration, for suppressing a blood glucose level increase by continuous absorption of glucose into a body and/or suppressing an infectious disease, the method comprising:
- a step of making an osmotic pressure regulator containing a rare sugar,
- wherein the rare sugar, D-allose and/or D-allulose, is mixed into an osmotic pressure regulator containing D-glucose,
- and the osmotic pressure regulator containing the rare sugar is mixed into a mixture with a peritoneal dialysate, an ophthalmic composition, or an infusion.