What we can tell you from research is this. Drug discovery to products in CVS can take 20 years sometime - not very helpful for many of us alive now! Thus people are making decisions to try CBD based on the very promising research about CBD - despite traditional large scale trials for certain conditions not having occurred yet.
There is promising research that both THC and CBD are neuro protective and may have implications in diseases such as Alzhiemer's.
I would try taking about 25-50mg of CBD once in the morning and once at night, for a week or two and see how you feel. Different research trials have dosed people with 100-800mg commonly per day.
Don't forget that THC also has neuro protective properties - even at very low doses. You may wish to try a 2.5 mg THC mint every night at bed as well based off some interesting animal research.