When you say "crazies" I wonder what you mean? I was found to be very depleted B12 level. They hung B12, potassium and magnesium on my IV. I eat really good food but way too little for too long. My surgeon recommended 1000mg of B12 following my release and I messed that up and was only taking 25mg. When I realized last week I had the 1000iu on my vitamin D confused with my B12, I changed it of course. In the meantime, I spoke with my daughter who is a R.N. ad was shocked to learn just how much B12 helps us an is not easily absorbed apparently. In hindsight, it is no wonder I still felt like I had "brain fog" from the surgery and was finding it so hard to focus on paperwork, appointment times, etc. The elderly are much more likely to suffer from the mental aspects of anesthetic but that does not mean that us 50 year olds are immune.