Quick answer
Peanut butter is better avoided for guinea pigs. It is not a useful food for this species, even if it is safe for another pet.
Skip this food and choose a species-appropriate option instead.
Seed / nut safety check
Can Guinea Pigs Eat Peanut Butter?
Peanut butter is better avoided for guinea pigs. It is not a useful food for this species, even if it is safe for another pet.
Preparation
Use plain xylitol-free peanut butter only.
Watch-outs
High fat; label check is mandatory.
Why this answer changes by species
Guinea Pigs usually rely on grass hay plus vitamin C produce. That makes peanut butter different from a generic human-food answer, especially around low-vitamin treats, sugar, dairy, and animal protein.
Related foods for guinea pigs
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Sources used
FAQ
Can guinea pigs eat peanut butter?
Peanut butter is better avoided for guinea pigs. It is not a useful food for this species, even if it is safe for another pet.
How should peanut butter be prepared for guinea pigs?
Use plain xylitol-free peanut butter only.
What should I watch for with peanut butter and guinea pigs?
High fat; label check is mandatory.