Provided is a material safely promoting the production of estrogen in a living body. The invention relates to use of a compound represented by the following formula (I) or a solvate thereof for producing an aromatase activator. The invention relates to an aromatase activation method comprising administering a compound represented by the following formula (I) or a solvate thereof (wherein the dashed line indicates that the bond may be a double bond, provided that a and b in the formula (I) do not simultaneously represent a double bond).