Potion of Growth

Potion, minor, uncommon

When you drink this potion, you gain the “enlarge” effect of the reduce spell for 1d4 hours (no concentration required). The red in the potion’s liquid continuously expands from a tiny bead to color the clear liquid around it and then contracts. Shaking the bottle fails to interrupt this process.

Source: Dungeon Master’s Guide p. 187. Available in the SRD