I continue to be confused on this. Lately I'm seeing a number of people state that there is really no such thing as "overmethylation," at least for the average person taking B12/folate/etc. They go on to state that in fact, the issue is probably that you don't have enough folate in your system. Thoughts? Anyone with some experience here? I'm going to experiment a little today to see. I upped my B12 dosage to 2000mcg per day last week from my normal 1000mcg, and I was taking 1600mcg of folinic acid, my preferred form. There might have been a few days when I took 2400mcg. Hard to remember. Unfortunately, my heart rate has generally been in the 90s - low 100s since around Friday, and I feel short of breath. I keep having to yawn. I've tried taking niacin these last few days - 500mcg or more, as well as potassium, and while I thought I was initially getting some relief, my heart rate keeps shooting on back up. I usually get a lot of cramping in my legs when my potassium is the culprit, and my legs have been mostly fine... Wondering if I should start taking 800-1600mcg of folinic, perhaps without any or just a crumb of B12, to see if my issue is actually a lack of folate.