Guava can be used internally and externally to treat wrinkles.
Internally, it can be consumed as juice.
Externally, to target wrinkles more specifically, it can be found in cream form, combined with argan oil and almond oil. It is also available as an ointment, gel, lotion, or powder for making poultices.
The best option is to use an argan cream mixed with essential oil or guava powder.