hi Phred,
I accidentally ingest gluten or dairy that depression comes back with a vengeance and won't be appeased with any amount of b12
I'm not sure, are there other symptoms that come back with the depression? It could be folate insufficiency. The things that affected me by lessening depression are MeCbl, AdoCbl, L-methylfolate, Sam-e, zinc, TMG, D-ribose. Another could be biotin and even Vit D and any combination or all thereof. Sometimes it can take a lot more l-methylfolate. For depression Deplin research found 15mg the most effective size. Is there any folic, folinic, folinate, folate mentioned? These can hide under a number of names.