During the battle against Vegeta in the Saiyan Saga, Goku managed to pull off Kaioken x4, but this increased output had extremely adverse side effects due to the strain the technique puts on the body.

Kaioken increases power but poses risks like exhaustion due to intense ki control. Only Goku has mastered Kaioken, using up to x20 but never combining it with Super Saiyan. Combining Kaioken with ...

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The Kaioken technique, which Goku learned on King Kai’s planet during the Saiyan Arc, allowed the user to multiply their power levels a number of times over depending on how strong they are.