Hey there!
I have low B-12, D and Potassium. I get monthly B-12 injections and when the level gets high, we skip months because too much is definitely not good for you! I take D drops and Potassium pills daily. At this moment my B-12 is at a good level so we are skipping a couple of months, I have never noticed when the levels are up there that it helps my RSD at all.

That is not saying that it might not work for you. If you do choose to take any supplements, especially vitamin B, you need to do so under medical supervision because levels that are too high can be dangerous as well.

All the best,
Nanc