Patent ID: 8883121

Claim:
A granular preparation comprising: (a) a isotope-labeled compound, selected from the group of uracil and thymine, in which at least one of a carbon atom, an oxygen atom, and a nitrogen atom is labeled with an isotope, and (b) a sugar alcohol selected from the group of erythritol, mannitol, xylitol, sorbitol, maltitol, reducing paratinose, and lactitol, wherein the granular preparation is produced by mixing together the isotope-labeled compound and the sugar alcohol, and pulverizing a resulting mixture using a mill to create a powder material, wherein a particle diameter at 50% of the powder material is 5 to 20 μm, which is further formulated into a granular preparation, wherein the granular preparation has a mean particle diameter of 1400 μm or less.