Regeneration Techniques (再生術, Saiseijutsu) are ninjutsu that allows the user to heal their bodies from damage incurred. Depending on the strength of the techniques, some may be even powerful enough to purge the body of poison. Some regeneration techniques may be an application of medical ninjutsu onto the user's own bodies, while others may be gathering a huge amount of chakra to repair the body.
A potential drawback to regeneration techniques is that the body's cells are limited to how many times they can divide themselves in one's lifetime, and by accelerating that division to recreate lost limbs and organs, one is basically shortening their lifespan. Certain techniques of extreme destructive power, such as the True Fire of Samadhi and Destruction Beam are capable of overwhelming regeneration techniques.
The cells of Hashirama Senju possess an immense Regeneration Ability that requires no hand seals. Once Madara Uchiha acquired this power, along with becoming the Jinchūriki of the Ten-Tails, he elevated this regenerative power to the point of a form of "immortality", able to survive even from bisection at his waist.
- The Creation Rebirth was considered to be the "ultimate regeneration technique".
- Victor was known for his skills in regeneration techniques.
- Shinnō was noted to have invented many regeneration techniques, and having taught Orochimaru several of them. It was for this reason that Orochimaru desired to capture Shinnō, in hopes of extending his host's vitality.
- Boruto chapter 40, page 36
- Naruto Shippūden the Movie: The Lost Tower
- Tō no Sho, page 242
- Boruto chapter 16, page 15
- Boruto chapter 33, page 13
- Naruto Shippūden the Movie: Bonds
- Naruto Shippūden episode 114
- Naruto chapter 576, page 15
- Naruto chapter 578, page 6
- Naruto chapter 673, page 13
- Naruto chapter 676, page 1