juice up vs pep up

juice up and pep up both are verbs.

Word	Noun	Adjective	Verb	Adverb
juice up	No	No	Yes	No
pep up	No	No	Yes	No

As verbs, juice up and pep up are synonyms defined as:

Other synonyms of juice up include ginger up, jazz up.

juice up (verb)	pep up (verb)
make more interesting or lively	make more interesting or lively
	spur on or encourage especially by cheers and shouts