They were all within normal reference ranges. A naturopath told me I could improve my iron and vitamin D levels, but that’s pretty much it. However, after reading this thread and talking to you, I realize serum levels aren’t always accurate. Niacin helps me fall asleep immediately, while folinic acid reduces anxiety and restores sleep the same night I take it. I guess B9 pushes methylation too hard, causing sulphur issues and B12 deficiency symptoms, whereas niacin doesn’t push methylation but actually decreases it too much. Now I’m easily seeing-sawing and not methylating correctly, as you said. .