My vet told me that 50g (about 1/5 of the powder in a capsule for humans) per day for one cat really helps with the infections and stuff - but it should be continued for about 30 days.

I put it in plain yogurt, which Oscar loves! They both have a tart taste.

Is this something Luna could have for a couple of weeks every couple of months?

I really hope you find something that works. Poor Luna and poor you!

Glad she is feeling a bit better now.