The Perfect Detox is a sidequest in Star Ocean: The Divine Force that you can pick up at Baldaar Citadel.
Speak to Concerned Woman near the entrance of the Baldaar Citadel. A Passionate Man also needs an antidote and they ask you to bring them a Aquaberry Potion x2.
This item can be easily obtained through Item Crafting Compounding two Blueberries together.
Return to Concerned Woman once you have obtained your Aquaberry Potion x2 and turn in the quest.
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