This is just what a senzu bean is and who uses them for what.
What is a senzy bean you ask? Well it's a lil green bean that will revive even the most injured people.
Senzu beans used in Frieza Saga
.Goku receives a bean to go to planet Namek.
.Goku takes 3 beans on the space ship when he is heading for namek.
.Goku gives half a bean to krillin and half a bean to gohan.
.Goku gives one to Vegeta.
Cell Saga
.Yamcha gets one when he is almost killed by android 20.
.Vegeta gets one after destroying android 19.
.Piccolo gets one after android 20 sucks in his energy
.Tien,Yamcha,Vegeta and Piccolo get one after fighting androids 17 and 18.
.
Tien and Piccolo get one after their fight with 2nd form Cell.
.Krillin gets one after he is kicked ONCE by cell(shows how weak he is).
.Krillin gives on to Vegeta after his fight with 2nd stage/perfect cell.
.Goku give's one to Cell because he wants the fight between Gohan and Perfect Cell to be fair.
.Gohan gives all the Z Warrors a Senzu Bean each after fighting the Cell Juniors.
Buu Saga
.Goku gives Vegeta a bean in the fight against Majin Buu.
.Gohan gives Videl one after she nearly gets killed by Supopo Bitchi
