After supplementing now for about a month I feel TONS better. I have energy, no more brain fog, no more aching, honestly cannot tell you how better I feel. However one thing has remained elusive - libido. This has been ongoing for too long now and the relationship is suffering. It was one of the first things to go, assuming of course it is because of the B12 deficiency slowly getting worse. Does anyone know why B12 deficiency can cause loss of libido (does it even?!) and how long should it take to return? I've tried a Google but not really found much out there.