Thread:Morning Star TM/@comment-37644871-20200120155545/@comment-44501217-20200128192732

He was stated to have complete control over his blood through the ability to create weapons out of it, and it was never mentioned that he can stop poisons.

https://vsbattles.fandom.com/wiki/Risotto_Nero

This is the explaination of Nero's abilities, and while i don't trust VS Battles Wiki very much, but when i skimmed through Nero's story arc, i found that his ability to have complete control over his blood is just for creating weapons, but nothing that noted him to have inner body protection.