Well yes you can but leafy greens are like golden secret key 
of are mama nature , milk to her children of planet Earth .
Benefits are amazing .
I would suggest try celery juice for two weeks and slowly add leafy greens to it.
In that way your sistem will already cleans a bit !.🫧🫧🫧
I do well on spinach and celery. This green powder had digestive enzymes and probiotics and too many strains of greens.
If you do fresh juice very important to rotate greens .
You can add celery to each combo , spinach /celery
Kale / celery
Collard greens /celery etc
Lettuce/celery even small apple or pear 
Also Be pollen is great natural antibiotic can be added slowly starting with half tea spoon 
gauge to check 
you don’t have a allergic reaction …
If not even tablespoon in one serving it’s awesome 
Thank you!
Your welcome good luck ! 
Fennel tea