system
Given the following post, respond as if you're commenting on Reddit:
human
[Dragonball Z/Super] If a Saiyan got their wish for immortality granted, does this prevent them from triggering Zenkai?
gpt
In Super:

- Trunks and Vegeta theorize that there's an upper limit to how effective the Zenkai can be, and that Vegeta has already passed this limit.  This serves to explain why Vegeta didn't seem all that much more powerful after being defeated by Goku Black the first time, and coming back for a rematch.  If this is true, then losing the Zenkai to immortality would be meaningless, since they've already effectively lost it.  This does seem to be contradicted by Goku receiving what appears to be a Zenkai boost after being defeated by Jiren the first time.

- Goku black specifically says that he refused to wish for immortality because it would interfere with his ability to become stronger.  Whether this means the Zenkai wouldn't work, or *all* his efforts at becoming stronger would be less effective is unclear.  Zamasu certainly seems to have been able to grow in strength despite being immortal.