Forums Ask for advice B12 deficiency Reply To: B12 deficiency March 20, 2018 at 1:54 pm #376 janey 15 Posts Have you also had your vit D levels checked? I had 2 lots of blood panels and they still had not tested for D. When they did they could not even get a reading, it was very low indeed, and I was asleep all of the time. My B12 was also borderline (read low) but I have managed with daily tablets or drops under the tongue, but have hit Vit D and K2 to get energy levels up.