What supplements did you use with your loved one for dementia?

 I need to nurse my MIL back to health somehow, she has been living alone for a couple of months, and its going to be a while before we can even get to see a doc for diagnosis (great memory loss, lots of anger, etc), I would appreciate tips on supplements and care giving. I plan to use Melatonin to set up her sleep habits, fish oil... anything else that you tried and it worked? Thanks so much!!