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EDIT: Nevermind, i'm dumb. You have to activate Rage mechanically in the Rage dropdown menu first. Then you can visit the Volatile Serum to activate one there.
The dropdown menu in the Volatile Serum feature contains nothing.
https://photos.app.goo.gl/bezX3JNjoWsDkpFH8
https://photos.fife.usercontent.google.com/pw/AP1GczOZhgk3yFjZ-Ieq3V_hZ9hZKfEOvWqAhtsJj2nOW-DW9yz5Hka5zzKT=w410-h360-s-no-gm?authuser=0
EDIT: Nevermind, i'm dumb. You have to activate Rage mechanically in the Rage dropdown menu first. Then you can visit the Volatile Serum to activate one there.