Thanks guys!
I suggested Avanafil to my GP as it seems to have the least amount of side effects, plus I won't be having sex regularly.
I might give Maca powder a go after reading this:
https://www.rareddit.com/r/sex/comme...plements_that/
Makes sense to me to try a single supplement initially, otherwise will be confusing to know what is or isn't working.
Prefer to have zinc from natural sources and recently started adding some to my cereal.
Have also upped my intake of fish to 3x a week (sardines and salmon).