A few months after my first concussion I did some bloodwork and it was found that I had a very low b12 (level of 133). I was very weak and exhausted with high levels of anxiety, I started to slowly improve until I got my second concussion.

I supplemented with 2000mcg (per doctors orders) for a few months, got my blood rechecked and my level was >1500. I then cut down to 1000mcg a day and my level was 485.

I have been on the 1000mcg dose for a while now, but am wondering if I need more? I use Bulletproof supplements with success and they have a b12 supplement that is 5000mcg, is that too high or could it benefit me?