Brick Top,

The only supplements than can cause diarrhea are the vit C and magnesium oxide. Mag citrate is better. You have to take a lot of vit C to get diarrhea, usually 4 to 10 grams a day. This is a vit C dosing check know as bowel tolerance. Some suggest taking vit C until you have reached your bowel tolerance than back off. I use a different system. I take enough vit C that I expel it in my urine. This shows that there is more than is being metabolized.

You also may just be shocking your system.

Are you taking a multi that has zinc in it ? Zinc can help with diarrhea.

You can start with the D3, B-12, B-complex, and Omega 3 fish oil. These will give your brain a start.

My best to you.