Plus one to the user above! ^ I typed this before I saw your post, sorry!
I've heard that peas, if used, are only to be administered when your betta is seriously bloated and needs something that can clear his system out. I've been told that we can't use just any type of pea, since the ones we eat out of cans have been exposed to salt and other things that would sicken and kill our fishy friends. Besides that, peas are not recommended as a snack or daily food source, since bettas are carnivores, and vegetation isn't healthy for them to consume regularly. A supermod would definitely know more on the subject, so it would be wise to consult one of them.