@candycraash999 - take a look at this thread:
https://forums.phoenixrising.me/thr...ovide-a-similar-dose-to-b12-injections.75317/
I've read about B12 helping many people with brain fog. If you tried B12 before with no noticeable improvement, it might have been the form you took it in. It can be difficult to absorb or utilize when swallowed in pill form. I've had good results with liquid methylcobalamin (such as
this) which I squirt under my tongue and let absorb.
And transdermal is also a good way to get it.
I did do injections (self-administered) for quite awhile but didn't notice a difference. It wasn't until I started using the liquid methylcobalamin, daily, in high doses (5,000 - 10,000 mcg.), that I noticed an increase in energy. I think with the injections which I did 3 or 4 times a week, I wasn't getting enough.
And if your serum levels of B12 are "normal" or even high, that doesn't necessarily mean you're getting enough. We can have high B12 levels in our blood, but not in our cells. I have to take high doses of B12 despite high levels in my blood. On hair analysis my cobalamin levels show up as undetectable, despite all the B12 I take.
So you said you've tried supplements, but have you tried B12? and if so, in what form and how did you take it - orally, sublingually, transdermally? That can make all the difference.