Weight: ½ lb.
Estimated Value (Sane Cost Guide): 270 gp
DMG Value: 251 gp - 2,500 gp
When you drink this potion, you gain the "reduce" effect of the enlarge/reduce spell for 1d4 hours (no concentration required). The red in the potion's liquid continuously contracts to a tiny bead and then expands to color the clear liquid around it. Shaking the bottle fails to interrupt this process.
Source: DMG p187