When i put something like
/effect @p regeneration 10 0 in a Repeat Command Block
The regeneration doesnt regenerate life like its supposed to, it regenerates it super fast, like an instant_health, Look the video for example
Also for Health_Boost, it doesnt work at all on other mobs except player
Hey! This is how the effects works. Regeneration regenerates your health, instant health does this instantly.